Article
Physics, Applied
Yongle Zhang, Hanyi Xue, Meng Zhu, Zhaona Wang
Summary: A self-powered photodetector with distinguishable wavelength detection has been developed by using two tandem p-n junctions, which effectively reduce wavelength interference and separate photo-generated carriers. The photodetector achieves bidirectional transient photocurrents for ultraviolet and visible detection, and significantly improves peak-to-peak current through the pyro-phototronic effect.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Naveen Kumar, Umme Farva, Malkeshkumar Patel, Wu-Shin Cha, Jaehyeong Lee, Joondong Kim
Summary: In this study, a novel, eco-friendly sputtergrown p-n heterojunction thin-film device utilizing n-Ga2O3 and p-SnS was proposed and investigated for transparent photovoltaic (TPV) applications. By optimizing the thickness of Ga2O3 thin-film, the device achieved high photocurrent density and open-circuit voltage, demonstrating excellent photovoltaic performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Jonatan Holmer, Lunjie Zeng, Thomas Kanne, Peter Krogstrup, Jesper Nygard, Eva Olsson
Summary: In this study, the effect of mechanical strain on the photocurrent and electrical properties of single GaAs nanowires with radial p-i-n junctions was investigated using a nanoprobing setup. A uniaxial tensile strain of 3% led to a significant increase in photocurrent during NIR illumination, attributed to a decrease in nanowire bandgap energy. Analysis also showed how other properties, including nanowire resistance, were affected by the strain. Additionally, electron-beam-induced current maps indicated that the charge collection efficiency within the nanowire was not affected by strain up to 0.9%.
Article
Chemistry, Multidisciplinary
Hongxia Qian, Zhifeng Liu, Zhengang Guo, Mengnan Ruan, Weiguo Yan
Summary: This study investigated the photoelectrochemical performance of ternary sulfide photoelectrodes with the same nanostructure and applied bidirectional p-n heterojunctions. The use of ZnIn2S4/CuInS2 and CuInS2/ZnIn2S4 as photoanode and photocathode in the unassisted tandem PEC cell device achieved a relatively high photocurrent density of 0.06 mA cm(-2), providing new ideas for the design and manufacture of high-efficiency unassisted tandem PEC cell devices.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Xuan Wang, Yehua Tang, Wanping Wang, Hao Zhao, Yanling Song, Chaoyang Kang, Kefan Wang
Summary: In this study, Bi2Se3 film was deposited onto silicon nanowires using vacuum evaporation method to create a bulk heterojunction, resulting in a self-powered photodetector with a wide detection range and fast response speed. This silicon-based photodetector shows promise for near- and mid-infrared applications, making it a potential candidate for future optoelectronic devices.
Article
Materials Science, Multidisciplinary
Jianfeng He, Hongyu Chen, Qixiao Zhao, Yifan Wang, Yuan Pan, Shan Huang, Francis Chi-Chung Ling, Shuangpeng Wang, Shichen Su
Summary: Layer-structured beta-In2Se3 microwires were successfully prepared without a catalyst, serving as building blocks for high-performance photodetectors. A lateral p-n junction based on CuInSe2/In2Se3 microwire exhibited excellent photovoltaic characteristics with high rejection ratio and responsivity, offering new insights for the rational design of efficient and cost-effective photodetectors.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Priyanka Ramaswamy, Kendall Dawkins, Hirandeep Kuchoor, Rabin Pokharel, Jia Li, Shanthi Iyer
Summary: In this paper, high-performance self-assisted molecular beam epitaxy (MBE)-grown conventional core-shell (C-S) n-i-p GaAsSb nanowires (NWs) and a novel hybrid axial C-S n-i-p GaAsSb ensemble NW-based near-infrared photodetector (NIRPD) on nonpatterned Si substrate are demonstrated. The conventional C-S n-i-p GaAsSb NW exhibits a high responsivity and detectivity, while the hybrid axial C-S n-i-p GaAsSb has band-gap-engineered for a longer wavelength. The findings suggest the potential of the hybrid axial C-S NW architecture in expanding the applications of IRPD and other optoelectronic devices.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Dewu Yue, Xin Ju, Tao Hu, Ximing Rong, Xinke Liu, Xiao Liu, Hong Kuan Ng, Dongzhi Chi, Xinzhong Wang, Jing Wu
Summary: A lateral 2D WSe2 p-n homojunction with low contact resistance and high photoresponsivity was constructed using a plasma-treated doping method.
Article
Chemistry, Multidisciplinary
Jia-Jia Tao, Jinbao Jiang, Shi-Nuan Zhao, Yong Zhang, Xiao-Xi Li, Xiaosheng Fang, Peng Wang, Weida Hu, Young Hee Lee, Hong-Liang Lu, David-Wei Zhang
Summary: By employing mixed-dimensional heterojunction technology, a high-performance Te/ReS2 photodetector has been successfully fabricated, demonstrating superior sensitivity, fast response speed, and high responsivity and detectivity compared to pristine Te and ReS2 photodetectors.
Article
Environmental Sciences
Ajeet Kumar Singh, Rajan Walia, Madan Singh Chauhan, Ravi S. Singh, Vineet Kumar Singh
Summary: Through numerical simulation studies, it was found that interface defects have a significant impact on the performance of heterojunction solar cells, and increasing the bandgap of the absorber layer can improve the performance of the solar cells. Compared to n-TiO2/p-Cu2O heterojunction solar cells, n-TiO2/p-WS2 heterojunction solar cells showed an increase in performance of nearly 182%, and the performance was further enhanced by about 139% with the addition of a p-Cu2O hole transport layer. The best-simulated efficiency of the proposed hetero-structure solar cell was 28.86%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Shisir Devkota, Hirandeep Kuchoor, Kendall Dawkins, Rabin Pokharel, Mehul Parakh, Jia Li, Shanthi Iyer
Summary: In this study, a systematic design of growth experiments and subsequent characterization of GaAsSb heterostructure axial p-i-n nanowires on p-Si for ensemble photodetector application were presented. Various growth methods were explored to mitigate several growth challenges and improve the electrical and optical properties of the nanowires. The optimized GaAsSb axial p-i-n nanowires showed enhanced responsivity, detectivity, and reduced noise level, making them suitable for high-speed optoelectronic applications.
Article
Materials Science, Multidisciplinary
Nikita Gagrani, Kaushal Vora, Sonachand Adhikari, Yuxin Jiang, Chennupati Jagadish, Hark Hoe Tan
Summary: This study investigates the electrical and optical properties of n-type tin oxide film and explores its application in InP nanowire light emitting diodes. The research finds that the device with lower resistance and higher absorption performs better in terms of output power.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Applied
M. D. Dhileepan, Sandeep Kumar Lakhera, Bernaudshaw Neppolian
Summary: In this study, a Cu2NiSnS4/TiO2(B) heterojunction photocatalyst was prepared and showed significantly improved hydrogen production through optimizing interfacial contact and charge carrier separation.
Article
Nanoscience & Nanotechnology
Dong Hun Lee, Honghwi Park, Michael Clevenger, Hyeonghun Kim, Chung Soo Kim, Mingyuan Liu, Giyong Kim, Han Wook Song, Kwangsoo No, Sung Yeol Kim, Dong-Kyun Ko, Anne Lucietto, Hongsik Park, Sunghwan Lee
Summary: This study demonstrates a simple processing route to fabricate oxide-based p-n heterojunctions with high rectification performance. By selecting appropriate materials and post-processing methods, high on/off rectification behavior, low saturation current, and small turn-on voltage were achieved in the heterojunctions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Pawan Kumar, Sahana Nagappa Moger, Gowrish K. Rao, M. G. Mahesha
Summary: In this study, three functional heterojunctions based on SnS were fabricated using the low-cost SILAR technique, and detailed analysis was conducted. The experimental results showed that the n-SnO2/p-SnS heterojunction exhibited significant photo response and excellent photodetection figures of merit.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Automation & Control Systems
Juntian Qu, Renjie Wang, Peng Pan, Linghao Du, Zetian Mi, Yu Sun, Xinyu Liu
Summary: Nanomaterials possess superior properties and are suitable for various device applications. Nanomanipulation techniques under scanning electron microscopy (SEM) have enabled the testing of mechanical and electrical properties of nanomaterials. However, the seamless integration of mechanical, electrical, and optical testing techniques inside an SEM for multiphysical characterization of nanomaterials is still unexplored. In this work, a nanomanipulation system with integrated micro-photoluminescence setup is reported, and the effect of mechanical compression on the optoelectronic property of nanomaterials is revealed.
IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING
(2023)
Article
Physics, Applied
Zhanyong Xing, Haochen Zhang, Yue Sun, Lei Yang, Kunpeng Hu, Kun Liang, Dawei Wang, Houqiang Fu, Haiding Sun
Summary: In this work, an enhancement-mode (E-mode) AlGaN/GaN-based high-electron-mobility transistor (HEMT) with a graded AlGaN cap layer (GACL) is proposed. The GACL is designed to produce high-concentration polarization-induced holes and negative net polarization charges to benefit the normally-OFF operation of the device. The optimized graded-AlGaN-gated metal-semiconductor HEMT achieves a large threshold voltage of 4 V, and shortening the gate length and inserting an oxide layer can suppress gate leakage current and enhance gate voltage swing.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Review
Engineering, Electrical & Electronic
Ping Wang, Ding Wang, Shubham Mondal, Mingtao Hu, Jiangnan Liu, Zetian Mi
Summary: III-nitride semiconductors have been extensively studied as promising optoelectronic and electronic materials in the past decades. Recent experimental demonstrations of ferroelectricity in nitride materials have led to significant research interest and expanded their potential in next-generation technologies. Nitride ferroelectric semiconductors, with their unique advantages such as high polarization, breakdown field, Curie temperature, and enhanced optical properties, have enabled a wide range of applications in various devices and systems. This review discusses the development of nitride ferroelectric semiconductors from materials to devices, highlighting their advantages, achievements, challenges, and prospects.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Wan Jae Dong, Yixin Xiao, Ke R. Yang, Zhengwei Ye, Peng Zhou, Ishtiaque Ahmed Navid, Victor S. Batista, Zetian Mi
Summary: This study reports a binary photoelectrode of Pt catalyst-GaN semiconductor with promising efficiency, productivity, and stability for seawater hydrogen evolution. Pt nanoclusters anchored on GaN nanowires were introduced to improve the activity and stability of n(+)-p Si photocathodes for seawater hydrogen evolution. Pt/GaN/Si photocathodes achieved high current density and photon-to-current efficiency in seawater and phosphate-buffered seawater, and also demonstrated a record-high photocurrent density under concentrated solar light.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yang Kang, Danhao Wang, Yunzhi Gao, Siqi Guo, Kejun Hu, Boyang Liu, Shi Fang, Muhammad Hunain Memon, Xin Liu, Yuanmin Luo, Xiyu Sun, Dongyang Luo, Wei Chen, Liuan Li, Hongfeng Jia, Wei Hu, Zhenghui Liu, Binghui Ge, Haiding Sun
Summary: Researchers have developed a simple method to suppress the photocorrosion effect and enhance the photoresponse performance of n-GaN nanowires in a photoelectrochemical-type photodetector by using Co3O4 nanoclusters as a hole charging layer.
Article
Chemistry, Multidisciplinary
Shi Fang, Liuan Li, Danhao Wang, Wei Chen, Yang Kang, Weiyi Wang, Xin Liu, Yuanmin Luo, Huabin Yu, Haochen Zhang, Muhammad Hunain Memon, Wei Hu, Jr-Hau He, Chen Gong, Chengjie Zuo, Sheng Liu, Haiding Sun
Summary: Underwater optical communication (UOC) is gaining significant interest due to the continuous expansion of human activities in marine/ocean environments. Self-powered photoelectrodes that are water-durable and act as a battery-free light receiver in UOC play a crucial role in facing complex underwater conditions. A self-powered photoelectrochemical (PEC) photodetector using n-type gallium nitride (GaN) nanowires as a photoelectrode, decorated with an iridium oxide (IrOx) layer for optimizing charge transfer dynamics, breaks the responsivity-bandwidth trade-off limit and achieves an ultrafast response speed and high responsivity. This device also exhibits a large bandwidth, making it one of the highest performing self-powered photodetectors in optical communication systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shi Fang, Liuan Li, Weiyi Wang, Wei Chen, Danhao Wang, Yang Kang, Xin Liu, Hongfeng Jia, Yuanmin Luo, Huabin Yu, Muhammad Hunain Memon, Wei Hu, Boon S. Ooi, Jr-Hau He, Haiding Sun
Summary: This research reports a bipolar-junction photoelectrode with a gallium nitride (GaN) p-n homojunction nanowire array, operating in electrolyte, and demonstrating bipolar photoresponse controlled by different wavelengths of light. By rationally decorating the nanowires with a ruthenium oxide (RuOx) layer, guided by theoretical modeling, the resulting RuOx/p-n GaN photoelectrode exhibits significantly boosted bipolar photoresponse compared to the pristine nanowires. The loading of the RuOx layer optimizes surface band bending, promotes charge transfer, and enhances the efficiency of redox reactions, leading to improved positive and negative photocurrents. Lastly, a dual-channel optical communication system is constructed using only one photoelectrode to decode encrypted dual-band signals.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
David Arto Laleyan, Woncheol Lee, Ying Zhao, Yuanpeng Wu, Ping Wang, Jun Song, Emmanouil Kioupakis, Zetian Mi
Summary: Two-dimensional hexagonal boron nitride (h-BN) shows great promise for far ultraviolet (UV-C) light emission with higher quantum efficiency than other indirect bandgap materials, enabled by strong excitonic effects and efficient exciton-phonon interactions. This study offers a new approach for the design and development of far UV-C optoelectronic devices and quantum photonic devices using 2D semiconductor active regions.
Article
Chemistry, Physical
Danhao Wang, Ding Wang, Peng Zhou, Mingtao Hu, Jiangnan Liu, Shubham Mondal, Tao Ma, Ping Wang, Zetian Mi
Summary: Through high-resolution X-ray photoelectron spectroscopy measurements, we discovered a thick oxide layer on ScAlN when exposed to air, which significantly affects its characterization and electronic structure evaluation. By excluding the possible impact from the surface oxide layer, the band alignment of Sc0.18Al0.82N/GaN can be accurately determined. Simulation results further demonstrate that the Sc0.18Al0.82N barrier layer offers excellent charge carrier confinement and a high density of two-dimensional electron gas (2DEG) at the heterostructure interface, crucial for high-performance GaN-based high electron mobility transistors (HEMTs).
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Shudan Xiao, Huabin Yu, Muhammad Hunain Memon, Hongfeng Jia, Yuanmin Luo, Rui Wang, Haiding Sun
Summary: In this work, a strategy called perimeter-to-area ratio (P/A ratio) engineering is used to enhance the optical performance of deep-ultraviolet micro-scale LED (DUV mu-LEDs). Different shapes of DUV mu-LEDs were designed and fabricated, and it was found that the quadrilateral mu-LEDs with the largest P/A ratio exhibited the highest external quantum efficiency (EQE) and light output power. The increased P/A ratio also led to better performance in smaller-sized mu-LEDs through improved light extraction, current spreading, and sidewall out-radiation of self-generated heat.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Haochen Zhang, Kunpeng Hu, Yue Sun, Lei Yang, Zhe Huang, Yifu Guo, Junyang Deng, Kun Liang, Zhanyong Xing, Hu Wang, Mingshuo Zhang, Yao Chen, Shiping Guo, Mengmeng Li, Haiding Sun
Summary: In this work, an effective room-temperature passivation strategy for GaN-on-Si high-electron-mobility transistors (HEMTs) is reported, which improves device stability by introducing a spin-coated CYTOP organic passivation layer. The CYTOP coating suppresses the devices' interface states to a low level at a shallow energy trap. As a result, improved device stability is achieved, along with reduced leakage current, smaller voltage hysteresis, reduced current collapse, and mitigated device degradation after long-term electrical stress. It is also found that the CYTOP-passivated HEMT can exhibit stable rectification behavior under elevated temperatures, demonstrating the high-temperature robustness of this organic passivation. These results highlight the potential of this room-temperature passivation strategy for electronic systems in complex conditions and harsh environments.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Suhyun Nam, Wenhao Peng, Ping Wang, Ding Wang, Zetian Mi, Amir Mortazawi
Summary: Modern wireless communication systems are becoming more complex and pose new challenges for RF front-end design. This study introduces a film bulk acoustic wave resonator (FBAR) with a composite ferroelectric/piezoelectric transduction layer that can operate selectively at higher order resonant modes in the millimeter wave spectrum without compromising k(t)(2). The resonator has a fundamental mode at GHz with k(t)(2) of 5.2%, but can switch to a higher order response at 31 GHz with k(t)(2) of 5.5%).
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Chong Xing, Ruichen Liu, Yan Zhang, Dongcheng Xie, Yudong Wang, Yuan Huang, Muhammad Mustafa, Haochen Zhang, Zhongyu Shi, Lei Xu, Feng Wu
Summary: This paper presents a SnO2-based six-channel single-layer-electrode temperature-modulated metal oxide (MOX) gas sensor cell with excellent gas discrimination and ultra-low power consumption. The proposed device features horizontally arranged heater and detecting electrodes on the same layer without an isolation layer. The temperature distribution in the active region of the MOX gas sensor can be effectively tuned by the strategically designed heater width on each sensing channel to achieve high-resolution gas detection.
2023 IEEE 36TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS
(2023)
Review
Chemistry, Physical
Wan Jae Dong, Zetian Mi
Summary: The depletion of carbon-based fuels and emerging environmental problems are driving the demand for green energy sources. This review introduces 1D nanostructured III-nitrides for artificial photosynthesis, highlighting their synthesis methods, properties, efficiency, and stability. The challenges and prospective insights for future development are also discussed.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)