Mojtaba Kahrizi

Mojtaba Kahrizi

Concordia University

H-index: 22

North America-Canada

About Mojtaba Kahrizi

Mojtaba Kahrizi, With an exceptional h-index of 22 and a recent h-index of 13 (since 2020), a distinguished researcher at Concordia University, specializes in the field of MEMS, nanaotechnology.

His recent articles reflect a diverse array of research interests and contributions to the field:

CuInS2/Poly (triarylamine)(PTAA) binary composite as an efficient hole transporter for carbon electrode-based perovskite solar cells

Recent Advances in Poly (3‐hexylthiophene) and Its Applications in Perovskite Solar Cells

In silico design and analysis of Pt functionalized graphene-based FET sensor for COVID-19 biomarkers: A DFT coupled FEM study

Structural health monitoring: modeling of simultaneous effects of strain, temperature, and vibration on the structure using a single apodized π-Phase shifted FBG sensor

Antibacterial, antifungal, antiviral, and photocatalytic activities of TiO2 nanoparticles, nanocomposites, and bio-nanocomposites: Recent advances and challenges

Localized surface plasmon resonance biosensor designed for high refractive index volatile organic compound (VOC) biomarkers detection in visible spectrum

Poly(N,N′‐bis‐4‐butylphenyl‐N,N′‐biphenyl)benzidine as Interfacial Passivator for Dopant‐Free P3HT Hole Transport Layer‐Based Perovskite Solar Cell in …

Fabrication, Characterization and Modelling of Piezoelectric PVDF-TrFE polymer as a Force Sensor Using Spin Coating Method

Mojtaba Kahrizi Information

University

Concordia University

Position

Professor of Electrical and Computer Engineering

Citations(all)

2554

Citations(since 2020)

768

Cited By

1838

hIndex(all)

22

hIndex(since 2020)

13

i10Index(all)

60

i10Index(since 2020)

20

Email

University Profile Page

Concordia University

Mojtaba Kahrizi Skills & Research Interests

MEMS

nanaotechnology

Top articles of Mojtaba Kahrizi

CuInS2/Poly (triarylamine)(PTAA) binary composite as an efficient hole transporter for carbon electrode-based perovskite solar cells

Authors

Hassan Kassem,Alireza Salehi,Mojtaba Kahrizi,Ziba Jamali

Journal

Materials Research Bulletin

Published Date

2024/2/1

Perovskite solar cells (PSCs) with doped 2,2′,7,7′-Tetrakis[N,N-di(4- methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMeTAD) hole transport layer HTL suffers from instability due to dopants' hygroscopic nature. To ensure stability, inorganic materials are used as replacements, but still suffer from several drawbacks that can compromise their HTL role. Herein, we introduce organic Poly(triarylamine) (PTAA) into CuInS2 inorganic HTL to form a binary composite that suppresses these drawbacks. Results show a better hole extraction and favorable energy level alignment in binary-based devices concerning CuInS2-only devices, resulting in improved power conversion efficiency (PCE) from 14.68 to 16% after aging. Stability tests indicate binary HTL-based devices' superior stability retaining their complete initial PCE after 1720 h in a dark inert medium (∼15% humidity), and 70% after 408 h in a thermally …

Recent Advances in Poly (3‐hexylthiophene) and Its Applications in Perovskite Solar Cells

Authors

Hassan Kassem,Alireza Salehi,Mojtaba Kahrizi

Published Date

2024/2/5

2,2',7,7'‐Tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9'‐spirobifluorene (Spiro‐OMeTAD) is considered the backbone of high performance in perovskite solar cells (PSCs) with the highest recorded power conversion efficiency near 26%. Devices with Spiro‐OMeTAD as a hole‐transport material (HTM) inherit very low stability due to the use of ionic‐based and unstable hygroscopic dopants to boost their hole mobility, hindering their stability. Poly(3‐hexylthiophene) (P3HT) is considered one of the promising HTM candidates, due to its formidable physical and electronic properties including higher hole mobility and thermal and moisture‐resisting nature. Despite these advantages, pristine P3HT‐based PSCs suffer low photovoltaic performances owing to unmatched perovskite/hole‐transport layer (HTL) interface and low mobility compared to doped HTMs. Today, studies are focusing on how to manage the interface …

In silico design and analysis of Pt functionalized graphene-based FET sensor for COVID-19 biomarkers: A DFT coupled FEM study

Authors

Paramjot Singh,Parsoua Abedini Sohi,Mojtaba Kahrizi

Journal

Physica E: Low-dimensional Systems and Nanostructures

Published Date

2022/1/1

In this study, a backend gate GFET based sensor for the detection of COVID-19 via volatile organic compound biomarkers is designed and simulated. Graphene as the channel of the device is used as an adsorbing site for a biomarker, ethyl butyrate and the effect of the adsorption on the transport characteristics of the device is used as a sensing parameter. Functionalization of graphene with Platinum ameliorates the enticement between the biomarker and the host material calculated via adsorption energy. Density Functional Theory (DFT) is used to calculate the electronic and surface properties of the channel of the device, with and without adsorption of the biomarker. The calculated characteristic properties of the channel are used to figure out the transport properties of the device through COMSOL Multiphysics. Results show that adsorption of the biomarker on the functionalized graphene changes the dynamics of …

Structural health monitoring: modeling of simultaneous effects of strain, temperature, and vibration on the structure using a single apodized π-Phase shifted FBG sensor

Authors

Farinaz Kouhrangiha,Mojtaba Kahrizi,Khashayar Khorasani

Journal

Results in Optics

Published Date

2022/12/1

There are vast fields of application for optical fiber sensors. Fiber Bragg Gratings (FBGs) are commonly used for Structural Health Monitoring (SHM) as an optical sensor to detect various physical phenomena affecting the system to assess its structure in a reliable and accurate manner. Due to the cross-sensitivity of the FBG detection, identifying the effects of each individual parameter on the FBG is a nontrivial task. This paper describes theoretical analysis of a single π-Phase Shifted Fiber Bragg Grating(π-PSFBG) behavior under axial distributions of three simultaneous parameters. Moreover, numerical simulations of an Apodized π-PSFBG are conducted to evaluate the performance of this non-uniform FBG under various strain, temperature, and vibration loads. The optimum apodization function is applied to the spectral signal to improve the properties of the sensor spectrum. Finally, the affecting parameters should …

Antibacterial, antifungal, antiviral, and photocatalytic activities of TiO2 nanoparticles, nanocomposites, and bio-nanocomposites: Recent advances and challenges

Authors

Mohammad Reza Amiri,Mehran Alavi,Mojtaba Taran,Danial Kahrizi

Published Date

2022/6

The applications of nanomaterials specifically metal and metal nanoparticles in various medical and industrial fields have been due to their unique properties compared to bulk materials. A combination of pharmacology and nanotechnology has helped the production of novel antimicrobial agents to control resistant microorganisms of bacteria and fungi. The properties of metal nanoparticles and metal oxides such as titanium dioxide (TiO2), zinc oxide (ZnO), silver (Ag), and copper (Cu) are well known as efficient antimicrobial agents. In particular, TiO2 nanoparticles have been considered as an attractive antimicrobial compound due to their photocatalytic intrinsic and their stable, non-toxic, inexpensive, and safe physicochemical properties. Therefore, in this review, recent advances and challenges of antibacterial, antifungal, antiviral, and photocatalytic activities of TiO2 nanoparticles, nanocomposites, and bio …

Localized surface plasmon resonance biosensor designed for high refractive index volatile organic compound (VOC) biomarkers detection in visible spectrum

Authors

Amilla Puspaduhita,Dadin Mahmudin,Isa Anshori,Akhmadi Surawijaya

Published Date

2022/11/8

Material, shape, size, and aspect ratio affect the biosensing capabilities of localized surface plasmon resonance (LSPR) biosensors. In this work, biosensing capabilities of LSPR biosensor with variations in transducer design parameters were demonstrated. The highest sensitivity obtained throughout this research was 4343,67 nm/RIU using palladium nanoarray disks, and the highest FOM of 25 was obtained using silver nanodisk that has diameter of 50 nm.

Poly(N,N′‐bis‐4‐butylphenyl‐N,N′‐biphenyl)benzidine as Interfacial Passivator for Dopant‐Free P3HT Hole Transport Layer‐Based Perovskite Solar Cell in …

Authors

Hassan Kassem,Alireza Salehi,Mojtaba Kahrizi,Hamid Mirzanejad,Amin Hedayati,Behnam Khorasani

Journal

Energy Technology

Published Date

2022/5

The best‐recorded performance of perovskite‐based solar cells (PSCs) in regular mesoscopic architecture is generally associated with the use of the common 2,2′,7,7′‐tetrakis[N,N‐di(4‐methoxyphenyl)amino]‐9,9′‐spirobifluorene (Spiro‐OMeTAD). However, the need for lithium‐based hygroscopic dopants hinders the chemical and environmental stability of the devices. This work presents a passivated stable PSC device based on a dopant‐free poly(3‐hexylthiophene) (P3HT) hole transport layer. By introducing a poly(N,N′‐bis‐4‐butylphenyl‐N,N′‐biphenyl)benzidine (polyTPD) interlayer at the perovskite/P3HT interface, the parameters of the low‐performance pristine P3HT‐based cells are improved. This introduction leads to optimizing the P3HT film morphology, interfacial defects, and charge extraction, along with a significant suppression of interfacial recombination and enhancement of the cell power …

Fabrication, Characterization and Modelling of Piezoelectric PVDF-TrFE polymer as a Force Sensor Using Spin Coating Method

Authors

Saman Namvarrechi

Published Date

2021/1/22

Since last decades, needs of new valuable material and reliable sensing technologies were among the researcher's focus for different industry’s application. Piezoelectric Polyvinylidene Fluoride (PVDF) polymer and its copolymer, Trifluoroethylene (TrFE), are one of these materials that can be a strong candidate for new transducers and sensors due to its electromechanical properties for force/pressure sensing in different industries such as biomedical device companies. Since PVDF is Biocompatible, a thin film of it can be integrated with biomedical devices using adhesive materials. However, it is not advisable for biomedical devices/tools to use those materials due to potential toxicity of gluing different objects inside human body. An example of such devices is laparoscopic tools used in Minimally Invasive Surgery (MIS), where PVDF film is deployed at the tip of an endoscopic grasper for force and softness sensing. To avoid toxicity problem, it is possible to deposit PVDF film directly on a potential device using a spin coating approach and fabricate it from scratch. However, it has its own challenges. In this research, PVDF-TrFE polymer is deposited via spin coating method and treated with various post-deposition processes to investigate its piezoelectricity and amount of electroactive β phase. These processes include different post thermal annealing, the effect of spin coating speed, different layer of deposition and presence of additional hydrate salt. Using FTIR spectroscopy and SEM images, the amount of the β phase and porosity of each sample is determined. In addition, the optimum experimental study is established by considering every …

Finite element modelling of bandgap engineered graphene FET with the application in sensing methanethiol biomarker

Authors

Paramjot Singh,Parsoua Abedini Sohi,Mojtaba Kahrizi

Journal

Sensors

Published Date

2021/1/15

In this work, we have designed and simulated a graphene field effect transistor (GFET) with the purpose of developing a sensitive biosensor for methanethiol, a biomarker for bacterial infections. The surface of a graphene layer is functionalized by manipulation of its surface structure and is used as the channel of the GFET. Two methods, doping the crystal structure of graphene and decorating the surface by transition metals (TMs), are utilized to change the electrical properties of the graphene layers to make them suitable as a channel of the GFET. The techniques also change the surface chemistry of the graphene, enhancing its adsorption characteristics and making binding between graphene and biomarker possible. All the physical parameters are calculated for various variants of graphene in the absence and presence of the biomarker using counterpoise energy-corrected density functional theory (DFT). The device was modelled using COMSOL Multiphysics. Our studies show that the sensitivity of the device is affected by structural parameters of the device, the electrical properties of the graphene, and with adsorption of the biomarker. It was found that the devices made of graphene layers decorated with TM show higher sensitivities toward detecting the biomarker compared with those made by doped graphene layers.

Surface Study of Volatile Organic Compounds (VOCs) Biomarkers Adsorption on Functionalized Graphene and its Application in FET Based Biosensors

Authors

Paramjot Singh

Published Date

2021/12/22

In this work, we have designed and simulated a graphene field-effect transistor, GFET, with the purpose of developing a sensitive biosensor for methanethiol, a biomarker for bacterial infections and ethyl butyrate, a biomarker for COVID-19. The surface of a graphene layer is engineered by manipulation of its surface structure and best cases are used as the channel of the GFET. Three methods, doping the crystal structure of graphene, decorating the surface with transition metals like Platinum and Palladium and defected graphene nanoribbons are utilized to induce the bandgap in the graphene layers. The techniques also change the surface chemistry of the graphene by enhancing its adsorption characteristics and make binding between graphene and biomarker possible. All the physical parameters are calculated for various variants of graphene in the absence and presence of the biomarker using counterpoise energy corrected density functional theory in Quantum ATK. The device was modelled using the finite element method in COMSOL Multiphysics. Our studies show that the sensitivity of the device is affected by the structural parameters of the device, the electrical properties of the graphene, and with adsorption of the biomarkers. It was found that the devices made of graphene layers decorated with transition metals show higher sensitivities toward detecting the biomarkers compared with those made by doped graphene layers and nanoribbons.

Optical fibers applied to aerospace systems prognostics: design and development of new FBG-based vibration sensors

Authors

G Quattrocchi,PC Berri,MDL Vedova Dalla,P Maggiore

Journal

IOP Conference Series: Materials Science and Engineering

Published Date

2021

Future generation actuation systems will be characterized by ever-increasing complexity. In this context, it will be necessary to adopt advanced health monitoring strategies to guarantee a high level of operational safety and system reliability. Prognostics and Health Management (PHM) is thus emerging as an enabling discipline for the design and operation of future advanced, complex systems. Smart systems with embedded self-monitoring capabilities are nowadays required in order to provide early faults identification and to perform innovative diagnostic and prognostic functions. In aerospace applications, the use of smart sensors could replace various types of traditional sensing elements, commonly used in structural monitoring with the additional capability of performing some prognostics or diagnostics tasks. This work proposes the first results of an experimental campaign aimed at evaluating and validating …

Effect of point defects in armchair graphene nanoribbons for biosensing of Methanethiol biomarkers: A DFT Study

Authors

Paramjot Singh,Parsoua Abedini Sohi,Mojtaba Kahrizi

Published Date

2021/7/28

In this study, we probe the surface engineered (vacancy and Stone Wales defective) hydrogen passivated armchair graphene nanoribbon with a width of 7 atoms as a biosensing material to detect methanethiol biomarkers. Induction of defects results in the decrement of the bandgap by the formation of the trapping states. After geometry optimisation, it is found that only vacancy induced armchair graphene nanoribbon can form strong binding with the biomarker, whereas Stone Wales defect induced armchair graphene nanoribbon show disassociation with the biomarker by having positive adsorption energy. Using density functional theory, the electronic properties of a vacancy-induced armchair graphene nanoribbon with and without adsorption of methanethiol are calculated, showing that methanethiol adsorption leads to increment in the bandgap of the host material by eliminating the trapping states. The work …

Apodized Pi-PSFBG Sensor in Structural Health Monitoring

Authors

Farinaz Kouhrangiha,Mojtaba Kahrizi,Khashayar Khorasani

Published Date

2021/5/31

Cross-sensitivity effects in simultaneous measurements using fiber Bragg grating (FBG)-based sensors is a challenging problem in structural health monitoring (SHM) applications. In this paper, a neural network (NN) approach is employed to discriminate between effects of strain, temperature, and vibration on the apodized pi-phase shifted FBG sensor using a single measurement of Bragg wavelength shift. The results demonstrate that the modeled sensor is capable of detecting three concurrent parameters in various ranges. Moreover, the identified parameters are clearly separated by our proposed NN methodology.

Thin films residual stress profile evaluation using test microstructures: Illustrated on an example of AlN film

Authors

Parsoua A Sohi,Irina Stateikina,Mojtaba Kahrizi

Journal

Journal of Vacuum Science & Technology B

Published Date

2021/5/1

In this study, we investigate the residual stress gradient of aluminum nitride thin film deposited by reactive pulse DC magnetron sputtering technique on a 200 mm diameter silicon wafer with a 1 μm layer of plasma enhanced chemical vapor deposition tetraethylorthosilicate. Stress measurements are obtained using in situ fabricated rotational beam microstructures. The rotating beam moves in response to relief of the residual stress on the connecting arms that experience lengthening or shortening due to compressive or tensile residual stresses, respectively. Various arm-beam connecting joints, separation gaps between the arms, and arm lengths are considered to determine the optimum microstructure for localized residual stress evaluation of the sputtered aluminum nitride. The displacement of the rotating beams with four different arm-beam connecting-joint designs is analytically modeled using COMSOL …

A Microhotplate for Gas Sensing and Vacuum Measurements

Authors

Dmytry Grudin

Published Date

2020/5/25

This thesis is devoted to the design, analysis and characterization of the thermal sensor based on Complementary Metal-Oxide-Semiconductor, (CMOS) compatible microhotplate (MHP). The MHP contains a split electric heater and temperature sensor, has a small area of 0.02mm2 and operates at low overheating temperature. These features of the sensing element which are not typical for traditional thermal sensors have been selected to compromise restrictions imposed by the CMOS fabrication process and materials available for the building of functional elements. The operating mode of the sensor, signal processing algorithms and the layout of the MHP were analyzed and adjusted such that to provide a stable and low noise operation even with potentially unstable poly-Si as the material used for the heater and temperature sensor. It was experimentally demonstrated that the proposed approach allows to detect extremely small variations of CO2 and O2 concentration in air. The sensor tested as a vacuum gauge demonstrated good sensitivity down to 1mTorr. The developed MHP due to its small size and true compatibility with CMOS fabrication process has good potential for volume production and can be used in applications where miniature and inexpensive sensors are needed. Freeze drying technology widely used in the pharmaceutic industry is suggested to be one of the possible applications for the developed sensor. It was demonstrated that the network of the developed thermal sensors can be used to monitor water sublimation during primary drying stage that may have an important practical value for the improvement of the quality and …

Design and simulation of a refractive index sensor based on SPR and LSPR using gold nanostructures

Authors

Armin Agharazy Dormeny,Parsoua Abedini Sohi,Mojtaba Kahrizi

Journal

Results in Physics

Published Date

2020/3/1

A refractive index sensor to detect chemicals based on surface plasmon resonance is designed and analytically investigated by a finite element method via COMSOL multiphysics. A tunable sensitivity is achieved by patterning the continuous metallic thin films with cavities or protrusions. The simulation results exhibit that the improved sensitivity of the devices is attributed to the co-excitation of SPR and LSPR modes. This result is obtained by studying the variation of the electric field intensity along several cut lines through the metallic layer. The penetration depth of the plasmon field is characterized, and accordingly, SPR and LSPR modes of the sensors are determined. The proposed sensor is calibrated for eight substances with refractive indices ranging from 1.333 to 1.38. The linearity of the calibration curve indicates the applicability of the sensor to identify the refractive indices of unknown mediums as a function …

Modeling and simulation of MEMS test structures using finite element method for stress mapping in thin film coatings

Authors

PA Sohi,I Stateikina,M Kahrizi

Published Date

2020/2/25

Thermal stress, which is due to the mismatch of coefficients of thermal expansion in multilayered structures, is often responsible for failure of thin film devices. MEMS test structures are quick and inexpensive approach for mechanical characterization of thin films during the fabrication process. The research presented here describes a test structure for in situ stress measurements based on rotational beam technique via finite element method analysis. A model was developed to induce tensile and compressive stresses on blanket thin film coatings. Evolution of the tensile/compressive stress induces certain displacement of the thin film as a function of applied temperature. The rotation of the indicator beam due to deflection/displacement of the blanket thin film is further investigated. The optimized layout of the test structure is proposed considering the stress profile and torsion of the indicator beam.

Recent Advances in Nanophotonics: Fundamentals and Applications

Authors

Mojtaba Kahrizi,Parsoua A Sohi

Published Date

2020/11/26

This volume brings together several recent research articles in the field of nanophotonics. The editors have arranged the chapters in three main parts: quantum devices, photonic devices, and semiconductor devices. The chapters cover a wide variety of scopes in those areas including principles of plasmonic, SPR, LSPR and their applications, graphene-based nanophotonic devices, generation of entangled photon and quantum dots, perovskite solar cells, photo-detachment and photoionization of two-electrons systems, diffusion and intermixing of atoms in semiconductor crystals, lattice and molecular elastic and inelastic scattering including surface-enhanced Raman Scattering and their applications. It is our sincerest hope that science and engineering students and researchers could benefit from the new ideas and recent advances in the field that are covered in this book.

Nanostructures

Authors

Sadia Ameen,M Shaheer Akhtar,Hyung-Shik Shin

Published Date

2020/2/19

This book highlights the functionality, significance, and applicability of nanostructure materials. The chapters in this book provide the logical and comprehensive information pertaining to the recent advances in the synthesis, characterization, and application of nanostructure materials for energy conversion and sensors. Written by an outstanding group of experts in the field, this book presents the latest advances and developments in nanostructure materials. We hope this book will help in describing the current position of nanostructure materials in the technological sphere as well as encourage scientists and engineers in deeper exploration of nanostructure materials to boost the technological advancement.

Fabrication and Characterization of Piezoelectric PVDF-TrFE Sensor Fabricated Using Spin Coating Method for Biomedical Device Applications

Authors

Sang Hoon Lee,Young Chul Choi,Min Su Kim,Kyung Moon Ryu,Young Gyu Jeong

Journal

Fibers and Polymers

Published Date

2020/3

Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based composite nanofibers containing different barium titanate (BaTiO3) nanoparticle contents of 10–60 wt% were fabricated by an efficient electrospinning. The piezoelectric performance of PVDF-HFP/BaTiO3 composite nanofibers under a periodic compressional pressure of ∼20 kPa was investigated by considering the BaTiO3 content and the electric poling. The X-ray diffraction patterns revealed the presence of piezoelectric tetragonal BaTiO3 nanoparticles in the composite nanofibers with PVDF β-form crystals. The SEM images demonstrated that the BaTiO3 nanoparticles were dispersed uniformly in the composite nanofibers at relatively low loadings of 10–20 wt%, but they formed aggregates at high loadings of 30–60 wt%. The piezoelectric performance of the composite nanofibers increased with the BaTiO3 content up to 20 wt% and …

See List of Professors in Mojtaba Kahrizi University(Concordia University)

Mojtaba Kahrizi FAQs

What is Mojtaba Kahrizi's h-index at Concordia University?

The h-index of Mojtaba Kahrizi has been 13 since 2020 and 22 in total.

What are Mojtaba Kahrizi's top articles?

The articles with the titles of

CuInS2/Poly (triarylamine)(PTAA) binary composite as an efficient hole transporter for carbon electrode-based perovskite solar cells

Recent Advances in Poly (3‐hexylthiophene) and Its Applications in Perovskite Solar Cells

In silico design and analysis of Pt functionalized graphene-based FET sensor for COVID-19 biomarkers: A DFT coupled FEM study

Structural health monitoring: modeling of simultaneous effects of strain, temperature, and vibration on the structure using a single apodized π-Phase shifted FBG sensor

Antibacterial, antifungal, antiviral, and photocatalytic activities of TiO2 nanoparticles, nanocomposites, and bio-nanocomposites: Recent advances and challenges

Localized surface plasmon resonance biosensor designed for high refractive index volatile organic compound (VOC) biomarkers detection in visible spectrum

Poly(N,N′‐bis‐4‐butylphenyl‐N,N′‐biphenyl)benzidine as Interfacial Passivator for Dopant‐Free P3HT Hole Transport Layer‐Based Perovskite Solar Cell in …

Fabrication, Characterization and Modelling of Piezoelectric PVDF-TrFE polymer as a Force Sensor Using Spin Coating Method

...

are the top articles of Mojtaba Kahrizi at Concordia University.

What are Mojtaba Kahrizi's research interests?

The research interests of Mojtaba Kahrizi are: MEMS, nanaotechnology

What is Mojtaba Kahrizi's total number of citations?

Mojtaba Kahrizi has 2,554 citations in total.

What are the co-authors of Mojtaba Kahrizi?

The co-authors of Mojtaba Kahrizi are Ahmadreza Hajiaboli.

    Co-Authors

    H-index: 4
    Ahmadreza Hajiaboli

    Ahmadreza Hajiaboli

    McGill University

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