Article
Nanoscience & Nanotechnology
Aniello Pelella, Alessandro Grillo, Enver Faella, Giuseppe Luongo, Mohammad Bagher Askari, Antonio Di Bartolomeo
Summary: The fabrication of a graphene-silicon junction involves the formation of a parallel metal-insulator-semiconductor (MIS) structure, which plays an important role in the optoelectronic properties of the device. The graphene-silicon device exhibits rectifying behavior and operates as a photodetector in both photocurrent and photovoltage mode in the visible and infrared spectral regions. The device's electrical behavior is explained by a model based on two parallel and opposite diodes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Ala K. Jehad, Mehmet Fidan, Ozhan Unverdi, Cem Celebi
Summary: A self-powered, high-performance graphene/Silicon Carbide ultraviolet photodetector was fabricated, and the effect of using monolayer and bilayer graphene on device performance parameters was investigated. The photodetector exhibited high spectral responsivity, maximum detectivity, and minimum noise equivalent power. Bilayer graphene showed no significant change in spectral responsivity but improved the response speed compared to monolayer graphene.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Nanoscience & Nanotechnology
Hasmat Mondal, Tamal Dey, Rabaya Basori
Summary: In this work, a significantly improved silicon nanowire (SiNW) based broadband photodetector is obtained by utilizing the core-shell structure of SiNWs with hydrothermally processed nitrogen doped graphene quantum dots (N-GQDs). The performance of the photodetector device is greatly enhanced by enlarging the effective surface area of the SiNW/N-GQD heterostructure through controlled KOH etching of SiNWs. The combination of SiNWs with low-cost hydrothermal processed N-GQDs results in enhanced optical absorption, suppressed dark current, photomultiplication of charge carriers, and improved carrier transport and collection efficiency, leading to significantly improved external quantum efficiency (EQE) exceeding 150% in the near IR and similar to 500% at 460 nm wavelength in the visible region.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Ceramics
Yuan-Han Hsu, Pin-Yi Chen, Chi-Shun Tu, Cheng-Sao Chen, J. Anthoniappen
Summary: This study demonstrates the potential of Ni-doped (Bi0.93Gd0.07)FeO3 ceramics for self-powered UV photodetectors, with enhanced photovoltaic effects achieved through improved charge carrier transportation in a heterostructure.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Cheng Wu, Xinzhi Luo, Xiaoming Yu, Xuan Yu, Kun Lin, Minghao Li, Zhenhua Li, Yu Cao, Yingtang Zhou
Summary: Low-cost and high-performance ZnO Schottky photodetectors (PDs) were fabricated by introducing Ti3C2TX into ZnO films via a facile spin-coated method. The ZnO/Ti3C2TX/ZnO compound film showed significantly improved performance on photocurrent, responsivity, noise equivalent power (NEP), normalized detection rate (D *), and linear dynamic region (LDR) compared with the original ZnO device. The enhanced conductivity and light absorption of the ZnO film after Ti3C2TX modification contributed to the superior performance.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Bo Feng, Xiaohang Pan, Tao Liu, Shuoqiu Tian, Tianyu Wang, Yifang Chen
Summary: This study reports a specially designed photovoltaic detector by integrating monolayer graphene onto a silicon-based nanopillar array, achieving the requirement of high detectivity in full bands at room temperature. The research results show that graphene plays a critical role in improving device performance.
Article
Nanoscience & Nanotechnology
Zengda Wang, Peiyu Zeng, Shuojie Hu, Xiaomei Wu, Jiaoyan He, Zhangting Wu, Wenhui Wang, Peng Zheng, Hui Zheng, Liang Zheng, Dexuan Huo, Yang Zhang
Summary: A novel ReS2/graphene/WSe2 heterostructure prepared by dry transfer demonstrates air-stable and high-performance photodetection, with specific detectivities up to 10(10) Jones and response time on the order of a millisecond. The heterostructure also exhibits polarization-sensitive photodetection and broad photoresponse from visible to infrared range, achieving a high photoresponsivity of 1.02 A W-1.
Article
Optics
QingHui Pan, SiHong Zhou, YanMing Guo, Yong Shuai
Summary: The grating structure on the surface of bilayer graphene/n-GaAs can enhance the photoelectric performance of photodetectors by exciting a plasmon mode. The efficient carrier separation and transfer between graphene and GaAs at the heterojunction area contributes to the high performance. This design shows potential for various electronic and optoelectronic applications.
Article
Engineering, Electrical & Electronic
Celal Alp Yavru, Murat Kaleli, Ismail Serkan Uncu, Murat Koc, Durmus Ali Aldemir
Summary: Glass/Mo/CIGS/Yb Schottky photodiodes were fabricated by the physical vapor deposition method. The structural and morphological characterization of the CIGS layer on Mo was carried out. The current-voltage (I-V) characteristics were studied in the dark, under solar light, and infrared. The study revealed that the diodes had an ideality factor of 1.55 and a zero bias barrier height of 0.84 eV in the dark. Moreover, the rise and decay times were shorter for solar light compared to infrared, and decreased as solar light intensity increased. The responsivity value for 100 mW/cm2 solar light was found to be 8.5 mA/W, while for infrared light it was 3.4 mA/W. Capacitance-voltage and conductance-voltage characteristics were also evaluated for different frequencies.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Multidisciplinary
Ian Jasper Agulo, Leonid Kuzmin
Summary: A single-pixel capacitively coupled Cold-Electron Bolometer (CEB) was developed and characterized in the current-biased regime, showing effective electron self-cooling for lower noise and higher dynamic range. The bolometer responsivity and noise equivalent power (NEP) were measured, with the best performance observed at modulation frequencies above 100 Hz. The study indicates photon-noise-limited operation of CEB for signal powers of 10 fW and higher at frequencies of 80 GHz and above.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Condensed Matter
Yuling Tang, Jun Chen
Summary: By replacing original p-Si with graphene to form a Gr/n-Si Schottky junction photodetector, the device shows better performance with improved barrier height, quantum efficiency, light responsivity, and detectivity compared to traditional p-Si/n-Si photodetectors.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Multidisciplinary Sciences
Yilun Wang, Xiang Li, Zhibin Jiang, Lei Tong, Wentao Deng, Xiaoyan Gao, Xinyu Huang, Hailong Zhou, Yu Yu, Lei Ye, Xi Xiao, Xinliang Zhang
Summary: Graphene-based photodetectors have advantages such as large bandwidth, compact size, and compatibility with silicon-based photonics platforms. An integrated optical coherent receiver based on graphene-on-plasmonic slot waveguide photodetectors was proposed and demonstrated, featuring a compact footprint and a large bandwidth exceeding 67 GHz. High-speed optical communication networks can benefit from the use of graphene-based photodetectors.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Abbas M. Selman, M. J. Kadhim
Summary: Vanadium dioxide nanocrystalline thin films were fabricated on Si substrates using RF magnetron sputtering method, showing good surface quality and particle distribution. The infrared photodetectors based on these films exhibited high sensitivity, responsivity, and detectivity at different bias voltages.
Article
Engineering, Electrical & Electronic
Ali Jabbar Fraih, Muneer H. Jaduaa Alzubaidy
Summary: This study investigates the impact of the number of graphene layers on the optoelectronic properties of the graphene/silicon heterojunction Schottky diode. The single-layer sample exhibited the highest responsivity in red light. The response of the samples to all wavelengths decreased with increasing temperature, and the response stability to light was favorable with less than a 2% change observed after one month.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Chan Wook Jang, Dong Hee Shin, Suk-Ho Choi
Summary: The use of h-BN interlayer and BCP passivation layer in TFSA-GR/PSi heterostructures enhances photodetection and photovoltaic parameters. The combination of h-BN and BCP layers reduces dark current and facilitates photocarrier collection, leading to improved photoresponse and energy harvesting efficiency. These heterostructures show great promise for application in self-powered or self-driving multifunctional optoelectronic devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Emre Arkan, M. Zeliha Yigit Arkan, Muhittin Unal, Eyup Yalcin, Hasan Aydin, Cem Celebi, Mustafa Can, Cem Tozlu, Serafettin Demic
Article
Materials Science, Multidisciplinary
N. Sahan, M. Fidan, C. Celebi
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2020)
Article
Chemistry, Physical
Yasemin Keskin, Ozhan Unverdi, Dogan Erbahar, Ismet Inonu Kaya, Cem Celebi
Summary: The friction coefficients of single-layer epitaxial graphene grown on Si-terminated and C-terminated faces of SiC substrate were measured using FFM under ambient conditions. The results showed that the friction coefficient of graphene on the C-terminated face of SiC is about two times smaller than on its Si-terminated face. The observed difference in friction coefficients cannot be solely attributed to the roughness of the graphene layers.
Article
Materials Science, Multidisciplinary
Dilce Ozkendir Inanc, Cem Celebi, Umit Hakan Yildiz
Summary: This study presents a lipid bilayer-based sensor interface on SiO2 encapsulated graphene field effect transistors (GFET). The pH sensitivity of wrinkled interfaced-GFETs was found to be ten fold larger than the flat ones, attributed to thinning of the oxide layer by formation of wrinkles facilitating electrostatic gating on graphene.
Article
Engineering, Electrical & Electronic
Nesli Yagmurcukardes, Abdullah Bayram, Hasan Aydin, Mehmet Yagmurcukardes, Yaser Acikbas, Francois M. Peeters, Cem Celebi
Summary: The sensitivity of graphene-based sensors to ammonia was improved by etching, and the etched sensors showed higher resistance to humidity.
IEEE SENSORS JOURNAL
(2022)
Article
Instruments & Instrumentation
M. Fidan, G. Donmez, A. Yanilmaz, O. Unverdi, C. Celebi
Summary: The impact of light on the Schottky barrier height in p-type graphene/n-type Si based near-infrared photodiodes is investigated. The zero-bias SBH in such photodiodes can be effectively tuned by illumination, and the nonlinear dependence of SBH on incident light is explained using the Shockley-Read-Hall model. Light-induced tunability of SBH at the graphene/semiconductor heterojunction is crucial for the development of optically driven devices with graphene as a key element.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Mehmet Fidan, Oezhan uenverdi, Cem celebi
Summary: This study investigated the impact of the number of graphene layers on the spectral responsivity and response speed of graphene/n-type Si-based Schottky barrier photodiodes. The results showed that increasing the number of graphene layers can enhance both spectral responsivity and response speed of the devices.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Physics, Applied
A. Yanilmaz, M. Fidan, O. Unverdi, C. celebi
Summary: In this study, a graphene/silicon on insulator based photodiode array was fabricated and its optoelectronic device performance was investigated. The results showed that each element in the array exhibited high spectral responsivity and excellent photocurrent reversibility under a self-powered operational mode, with good detectivity and low noise equivalent power.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Ogulcan Acikgoz, Enrique Guerrero, Alper Yanilmaz, Omur E. Dagdeviren, Cem Celebi, David A. Strubbe, Mehmet Z. Baykara
Summary: In this study, atomic force microscopy was used to measure the friction on Re-doped MoS2. Unlike the common observation of decreasing friction with increasing number of layers in two-dimensional materials, Re-doped MoS2 exhibits friction that is inversely proportional to the number of layers. Raman spectroscopy measurements and ab initio calculations reveal that this phenomenon is related to Re intercalation, with an increase in out-of-plane stiffness inversely correlating with the number of layers as the physical mechanism behind this remarkable observation, revealing a distinctive regime of puckering for 2D materials.
Article
Engineering, Electrical & Electronic
Nesli Yagmurcukardes, Abdullah Bayram, Hasan Aydin, Mustafa Can, Serafettin Demic, Yaser Acikbas, Cem Celebi
Summary: In this study, the NH3 sensing capabilities of graphene films were improved by modifying self-assembled monolayers. The modified graphene films showed a two-fold increase in NH3 uptake compared to the unmodified films. This suggests that self-assembled monolayers can enhance NH3 adsorption and improve the detection response.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ala K. Jehad, Mehmet Fidan, Ozhan Unverdi, Cem Celebi
Summary: A self-powered, high-performance graphene/Silicon Carbide ultraviolet photodetector was fabricated, and the effect of using monolayer and bilayer graphene on device performance parameters was investigated. The photodetector exhibited high spectral responsivity, maximum detectivity, and minimum noise equivalent power. Bilayer graphene showed no significant change in spectral responsivity but improved the response speed compared to monolayer graphene.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Alper Yanilmaz, Ozhan Unverdi, Cem Celebi
Summary: The study aims to reduce optical crosstalk and improve device performance by integrating graphene with silicon. The results show that using monolayer graphene as a separate electrode on the SOI substrate can greatly minimize optical crosstalk between neighboring elements. This research is expected to have significant implications in various technological applications such as multi-wavelength light measurement, level metering, high-speed photometry, and position/motion detection.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Physical
Emine Karagoz, Cigdem Tuc Altaf, Ecenaz Yaman, Ipek Deniz Yildirim, Emre Erdem, Cem Celebi, Mehmet Fidan, Mehmet Sankir, Nurdan Demirci Sankir
Summary: This study examines the performance of a metal/semiconductor/metal-type flexible photodetector made from pristine and manganese doped ZnO nanorods. The results show that increasing the concentration of zinc precursor improves the detectivity and responsivity of the photodetectors. Additionally, manganese doping further enhances the detectivity and responsivity of the photodetectors. This research demonstrates the ability to create high-performance flexible photodetectors even with low concentrations of zinc precursor.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Nazrin Abdullayeva, Cigdem Tuc Altaf, Alihan Kumtepe, Nazmi Yilmaz, Ozlem Coskun, Mehmet Sankir, Hamza Kurt, Cem Celebi, Alper Yanilmaz, Nurdan Demirci Sankir
ACS APPLIED NANO MATERIALS
(2020)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)