Article
Materials Science, Multidisciplinary
Tamer Guzel, Andac Batur Colak
Summary: This study investigates the usability of machine learning algorithms in determining important electrical parameters of Schottky diodes and develops a multi-layer artificial neural network model that can predict the parameters with high accuracy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Rishabh Raj, Himanshu Gupta, L. P. Purohit
Summary: In this study, vanadium pentoxide (V2O5) thin films were successfully grown on soda-lime glass using RF magnetron sputtering technique. The impact of different sputtered power on the growth, structural and optical properties of V2O5 films was systematically studied. The results showed that V2O5 films exhibited a preferred crystal orientation and good transmittance. The performance of the Schottky diode with V2O5 interface layer (IF) for solar cell applications was also investigated, which demonstrated the important role of the V2O5 layer in enhancing the diode's performance.
Article
Materials Science, Multidisciplinary
Sabiha Abdullah Omarbli, Arife Gencer Imer
Summary: In this study, the influence of a functional organic dye, phenol-sulfonphthalein (PSP), as an interfacial layer on electronic parameters of hybrid devices was investigated. It was found that the barrier height of the devices with the PSP layer was higher than that of the reference devices without the PSP layer, and the increase in barrier height depended on the work function of the top metal contacts. The highest and lowest barrier heights were obtained for the Sn/PSP/p-Si and Ag/PSP/p-Si devices, respectively, according to the TE theory. The results highlighted the importance of the PSP interface material and the work function of top contact metals in modifying the electronic parameters of the fabricated devices.
Article
Materials Science, Ceramics
Ethar Yahya Salih, Mohamed Bashir Ali Bashir, Altaf Hussain Rajpar, Irfan Anjum Badruddin
Summary: This article presents the preparation of porous silicon (PS)/copper oxide (CuO) film for visible light metal-semiconductor-metal photodetector application using electrochemical etching, pulsed laser deposition, and electrochemical deposition approaches. The fabricated PS/CuO photodetectors showed high crystallinity and dendrite-like morphology at a high post-processing temperature. Significant photocurrent and photo-responsivity values were observed, with the optimal photodetector demonstrating an estimated response/recovery time of 800 ms. This proposed device not only exhibits consistency but also provides an easy pathway for optoelectronic design.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Mesut Yalcin, Abdullah G. Al-Sehemi, Ibrahim Erol, Mecit Aksu, Sanjar Tillayev, Aysegul Dere, Ahmed A. Al-Ghamdi, Fahrettin Yakuphanog
Summary: GO-doped LaB6 nanocomposite-based Al/p-Si/GO:LaB6/Al photodiodes were fabricated and their electrical properties were studied. The results showed that these doped diodes had low ideality factors and high barrier heights, as well as high responsivity and detectivity. The study suggests that these diodes have potential for optoelectronic applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Engineering, Electrical & Electronic
F. S. Kaya, S. Duman, O. Baris, B. Gurbulak
Summary: In this study, Au/MG/n-Si/Ag diodes were fabricated using a low-cost drop coating method, and the fundamental parameters such as barrier height, ideality factor, and series resistance were determined through current-voltage measurements. Statistical analysis showed consistency in these parameters across the diodes.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Suchismita Sen, Argha Sarkar, Pinaki Chakraborty, Neeruganti Vikram Teja, Mayuri Kundu
Summary: This paper investigates the electrical properties of graphene/Al contact, ZnO/Al contact, and Al/graphene/ZnO contacts. Al metallization is performed using thermal vacuum coating technique, while spin coating method and shadow masking are used for depositing graphene and ZnO. Comparative analysis is made on parameters like saturation current, barrier height, and ideality factors using Schottky barrier height method. I-V characteristics are analyzed using a semiconductor parameter analyzer. Results show that the ZnO/Al contact has a better linearity with an ideality factor of approximately 0.059, while the Graphene/Al contact has the maximum saturation current and the ZnO/Al contact has the maximum barrier height.
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
V. Manjunath, Nanda Kumar Reddy Nallabala, C. Yuvaraj, Chandramohan Kukkambakam, Venkata Krishnaiah Kummara, Suresh Kumar, Shivani Sharma, M. V. Lakshmaiah, Vasudeva Reddy Minnam Reddy
Summary: This study investigated the influence of incorporating a Ta2O5 thin film at the Au/GaN interface, analyzing the fabricated Au/Ta2O5/n-GaN MIS junctions using I-V measurements and evaluating Schottky diode parameters. Different methods were used to extract the electrical parameters and compare them, showing good agreement. The conduction mechanisms under different bias conditions were identified, with the study attributing the superior rectification ratio and high Schottky barrier height to the deposition of an undoped GaN buffer layer.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Physics, Multidisciplinary
Defne Akay, Ugur Gokmen, Sema Bilge Ocak
Summary: In this study, the electrical properties of PbO/Zinc Oxide double-layer semiconductor diodes were investigated through measurement and calculation. Different parameter values were found and the energy distribution of interface state density was obtained.
Article
Optics
Anita S. Alber, Falah A-H Mutlak
Summary: The study aimed to produce Si nanostructures ultra-high sensitivity photodetector by a photoelectrochemical procedure, investigating the effect of etching time on porous silicon formation. The research demonstrated the microstructure and optoelectronic properties of porous silicon layers.
Article
Chemistry, Applied
R. Mallikarjun, Anum Mohammedi, Vaishnavi Kembhavi, Rajeev Joshi
Summary: In this study, catalytically active C7H6O/p-Si/Al Schottky barrier surfaces were developed using the method of thermal grafting in a homebuilt reactor. By adjusting the grafting temperature and dopant density, the barrier height was successfully tuned to achieve optimal molecular grafting on the semiconductor surface.
TOPICS IN CATALYSIS
(2022)
Article
Chemistry, Physical
Zeina A. Abdul Hameed, Falah A. -H. Mutlak
Summary: The study used an electrochemical method to create highly sensitive photodetector silicon nanostructures. The formation of porous silicon was studied under different factors, and an electrochemical procedure was used to change the current. It was found that porous silicon layers exhibited lower reflectance compared to bulk silicon. Three absorption peaks were observed in the Al/PS and PS/c-Si depletion regions, with a maximum quantum efficiency of 124.32% at an etching current of 25 mA/cm(2).
Article
Materials Science, Multidisciplinary
Fikriye Seyma Kaya, Songul Duman, Ikram Orak, Ozlem Baris
Summary: In this study, Au/n-GaP/Al and Au/chlorophyll-a/n-GaP/Al structures were fabricated using n-type GaP semiconductor. The performance characteristics of these structures were analyzed using SEM, I-V measurements, and C-V measurements, revealing that the chl-a thin film has an impact on the photovoltaic parameters of the Au/n-GaP/Al structure.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Junxue Ran, Renfeng Chen, Rui He, Xiaoli Ji, Jiankun Yang, Junxi Wang, Jinmin Li, Tongbo Wei
Summary: This letter presents the fabrication of quasi-vertical Schottky barrier diodes (SBDs) using AlN/Al0.6Ga0.4N heterostructure and investigates the temperature-dependent current transport. The device demonstrates significant improvements in terms of lower ideality factor, high on/off current ratio, and higher on-current compared to state-of-the-art AlN SBDs. The study reveals the importance of heterostructure engineering in overcoming challenges in AlN-based SBDs.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Applied
Shane R. Stein, Dolar Khachariya, Seiji Mita, M. Hayden Breckenridge, James Tweedie, Pramod Reddy, Kacper Sierakowski, Grzegorz Kamler, Michal Bockowski, Erhard Kohn, Zlatko Sitar, Ramon Collazo, Spyridon Pavlidis
Summary: We investigated the electrical characteristics of Ni Schottky contacts on n-type GaN films that underwent ultra-high-pressure annealing (UHPA), a crucial step for activating implanted Mg. Compared to contacts on as-grown films, contacts on these films showed low rectification and high leakage current. However, by using an optimized surface treatment to restore the GaN surface after UHPA, we achieved Schottky contacts with high rectification ratio (about 10^9), near-unity ideality factor (1.03), and barrier height of about 0.9 eV. These characteristics enable the development of GaN junction barrier Schottky diodes using Mg implantation and UHPA.
APPLIED PHYSICS EXPRESS
(2023)
Article
Engineering, Biomedical
Clementine M. Boutry, Levent Beker, Yukitoshi Kaizawa, Christopher Vassos, Helen Tran, Allison C. Hinckley, Raphael Pfattner, Simiao Niu, Junheng Li, Jean Claverie, Zhen Wang, James Chang, Paige M. Fox, Zhenan Bao
NATURE BIOMEDICAL ENGINEERING
(2019)
Article
Biochemical Research Methods
Silvan Staufert, Harun Torlakcik, Salvador Pane, Christofer Hierold
IEEE TRANSACTIONS ON NANOBIOSCIENCE
(2019)
Article
Physics, Applied
Lalit Kumar, Laura V. Jenni, Miroslav Haluska, Cosmin Roman, Christofer Hierold
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Analytical
Peter F. Satterthwaite, Sebastian Eberle, Stefan Nedelcu, Cosmin Roman, Christofer Hierold
SENSORS AND ACTUATORS B-CHEMICAL
(2019)
Article
Chemistry, Analytical
Seoho Jung, Roland Hauert, Miroslav Haluska, Cosmin Roman, Christofer Hierold
Summary: By using Ar-ion etching to remove the top layer of the electrode surface before nanotube placement, the contact resistance at the nanotube-metal interface can be significantly reduced. This results in a tenfold decrease in the median ON-resistance of transistors and a more than two orders of magnitude decrease in the interquartile range of resistance values.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
I. A. Mihailovic, K. Klosel, C. Hierold
Summary: The paper demonstrates the memristive functions of the room temperature thermoelectric material Bi-Se fabricated by electrochemical deposition in combination with silver-based contacts. Electrical measurements and temperature dependent measurements reveal the properties of the electrochemically deposited material, concluding that electrodeposition is a viable method for producing memristors.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2021)
Article
Electrochemistry
Katrina Klosel, Salvador Pane, Ian A. Mihailovic, Christofer Hierold
Summary: A method of template assisted electrochemical deposition is proposed for the synthesis of Bi2Se3 micropillars with controlled thickness and stoichiometry. The optimized conditions involve modifying the electrolyte composition and introducing resting pulses during the plating process. The resulting micropillars exhibit orthogonal structure and desirable electrical conductivity and Seebeck coefficient, demonstrating their potential for thermoelectric applications.
ELECTROCHIMICA ACTA
(2022)
Article
Engineering, Electrical & Electronic
Johannes Weichart, Cosmin Roman, Christofer Hierold
Summary: This article presents a tactile sensor array technology based on a flexible interconnection substrate, allowing for easy upscaling, compactness, high sensitivity, and robustness.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2021)
Article
Nanoscience & Nanotechnology
Stefan Nedelcu, Kishan Thodkar, Christofer Hierold
Summary: This article reports a customizable, portable, battery-operated, wireless platform for interfacing high-sensitivity nanoscale sensors, aiming to improve spatiotemporal measurement coverage of physical parameters. The platform has a wide current range and high versatility, suitable for signal acquisition from resistive nanosensors, with overall low power consumption, making it highly suitable for various sensing applications within the context of IoT.
MICROSYSTEMS & NANOENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Jian Zhang, Mickael L. Perrin, Luis Barba, Jan Overbeck, Seoho Jung, Brock Grassy, Aryan Agal, Rico Muff, Rolf Bronnimann, Miroslav Haluska, Cosmin Roman, Christofer Hierold, Martin Jaggi, Michel Calame
Summary: The rapid localization and characterization of nanomaterials is crucial for quality control and industrial adoption. This study presents a high-throughput method for quickly identifying nanomaterials using high-speed Raman imaging and deep learning analysis, along with an optimized scanning strategy.
MICROSYSTEMS & NANOENGINEERING
(2022)
Article
Engineering, Biomedical
Kai Petersdorff-Campen, Matthias A. Dupuch, Konstantinos Magkoutas, Mirko Meboldt, Christofer Hierold, Marianne Schmid Daners
Summary: This study demonstrates the integration of pressure sensors into a ventricular assist device, allowing continuous and accurate measurement of left ventricular pressure. The developed sensor model improves measurement accuracy by eliminating the influence of flow inside the device. This has significant implications for the validation of physiological control concepts in vivo.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2022)
Editorial Material
Ecology
Sarab S. Sethi, Mirko Kovac, Fabian Wiesemueller, Aslan Miriyev, Clementine M. Boutry
NATURE ECOLOGY & EVOLUTION
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Morten Vollmann, Cosmin Roman, Christofer Hierold
Summary: A new model based on harmonic balancing is used to predict the resonance peak shape and extract pre-strain and gauge factors of carbon nanotube resonators. The model is able to separate different current contributions and agrees well with experimental measurements.
2022 IEEE 35TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS CONFERENCE (MEMS)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Johannes Weichart, Marcel Ott, Thomas Burger, Christofer Hierold
Summary: Advanced tactile sensing plays a crucial role in enabling more interactive and flexible robotics or prosthetics. This study proposes a sensing technology that replicates the human sense of touch by manufacturing highly sensitive tactile sensors in dense arrays on a flexible substrate. The characterization of the sensor array and its readout electronics reveals that the sensors can resolve capacitance changes with high precision and without crosstalk. The study also demonstrates that the sensors can accurately detect and measure 3D forces.
2022 IEEE 35TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS CONFERENCE (MEMS)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Stefan Nedelcu, Thomas Burger, Christofer Hierold
2020 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)
(2020)
Article
Materials Science, Biomaterials
Mohammadreza Kasravi, Alireza Yaghoobi, Tahereh Tayebi, Mahsa Hojabri, Abdolkarim Talebi Taheri, Fatemeh Shirzad, Bahram Jambar Nooshin, Radman Mazloomnejad, Armin Ahmadi, Fatemeh A. Tehrani, Ghasem Yazdanpanah, Mohammad Hadi Farjoo, Hassan Niknejad
Summary: As a promising approach in translational medicine, the decellularization of discarded livers to produce bioscaffolds that support recellularization has potential in overcoming the limitations of conventional liver transplantation. In this study, the researchers investigated the use of matrix metalloproteinase (MMP) inhibition to preserve the extracellular matrix (ECM) during liver decellularization. The results demonstrated that the application of an MMP inhibitor significantly improved the preservation of ECM components and mechanical properties of the bioscaffolds, which supported cell viability and function in vitro. The study also confirmed that the MMP inhibition led to the inhibition of MMP2 and MMP9, providing a novel method to enhance ECM preservation during liver decellularization.
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Mohammadsadegh Nadimifar, Weiguang Jin, Clara Coll-Satue, Gizem Bor, Paul Joseph Kempen, Ali Akbar Moosavi-Movahedi, Leticia Hosta-Rigau
Summary: This study presents a metal-phenolic self-assembly approach that can prepare nanoparticles fully made of hemoglobin. The nanoparticles exhibit good oxygen binding and releasing capabilities.
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Jyoti Kumari, Roel Hammink, Jochem Baaij, Frank A. D. T. G. Wagener, Paul H. J. Kouwer
Summary: Fibrosis is the formation of fibrous connective tissue in response to injury, leading to organ dysfunction. A novel hybrid hydrogel combining synthetic polyisocyanide with hyaluronic acid has been developed, showing strong antifibrotic properties.
BIOMATERIALS ADVANCES
(2024)
Letter
Materials Science, Biomaterials
Melissa Machado Rodrigues, Cristian Padilha Fontoura, Charlene Silvestrin Celi Garcia, Sandro Tomaz Martins, Joao Antonio Pegas Henriques, Carlos Alejandro Figueroa, Mariana Roesch Ely, Cesar Aguzzoli
BIOMATERIALS ADVANCES
(2024)
Article
Materials Science, Biomaterials
Jessica Polak, David Sachs, Nino Scherrer, Adrian Suess, Huan Liu, Mitchell Levesque, Sabine Werner, Edoardo Mazza, Gaetana Restivo, Mirko Meboldt, Costanza Giampietro
Summary: Human skin equivalents (HSEs) play a crucial role in tissue engineering. This study introduces a 3D-printed culture insert to apply a static radial constraint on HSEs and examines its effects on tissue characteristics. The results show that the diameter of the culture insert significantly influences tissue contraction, fibroblast and matrix organization, keratinocyte differentiation, epidermal stratification, and basement membrane formation. This study provides important insights for the design of skin tissue engineering.
BIOMATERIALS ADVANCES
(2024)
Review
Materials Science, Biomaterials
Shiliang Chen, Tianming Du, Hanbing Zhang, Jing Qi, Yanping Zhang, Yongliang Mu, Aike Qiao
Summary: This paper reviewed the primary methods for improving the overall properties of biodegradable zinc stents. It discussed the mechanical properties, degradation behavior, and biocompatibility of various improvement strategies. Alloying was found to be the most common, simple, and effective method for improving mechanical properties. Deformation processing and surface modification further improved the mechanical properties and biological activity of zinc alloys. Meanwhile, structural design could endow stents with special properties. Manufacturing zinc alloys with excellent properties and exploring their interaction mechanism with the human body are areas for future research.
BIOMATERIALS ADVANCES
(2024)
