Article
Engineering, Electrical & Electronic
Amit K. Das, V. K. Sahu, R. S. Ajimsha, P. Misra
Summary: To achieve ultrafast response in MgZnO based self-powered Schottky type photodetectors, it is essential to decrease the junction capacitance and carrier transit time. In this study, Au/MgZnO/ITO Schottky junction photodetectors were fabricated in a crossbar pattern, resulting in a low junction capacitance of 27 pF and very fast visible blind self-powered ultraviolet (UV) photoresponse with rise and fall times of approximately 1.5 μs. These photodetectors also exhibited a peak responsivity of 49 mA/W at a wavelength of 280 nm and could potentially be applied in UV communication and imaging applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Nanoscience & Nanotechnology
Jun Dar Hwang, Meng-Shu Wu
Summary: High-performance solar-blind SAM-APDs were fabricated with a p-NiO/MgO/n-ZnO structure, showing carrier avalanche multiplication with a high gain and quantum efficiency. They have a high rejection ratio for UV/visible light and are suitable for practical applications as UV solar-blind photodetectors.
Article
Optics
Ning Li, Qingyi Zhang, Yongtao Yang, Yuanjun Tang, Tao Zhang, Jiaying Shen, Yuehui Wang, Fan Zhang, Yang Zhang, Zhenping Wu
Summary: Ga2O3-based avalanche photodetectors (APDs) have attracted increasing attention for their excellent photoelectric conversion capability in the UV solar-blind region. However, integrating high-quality epitaxial Ga2O3 with p-type semiconductor remains a challenge. In this work, we construct an APD consisting of epitaxial β-Ga2O3/La0.8Ca0.2MnO3 heterostructure. The pn junction APDs exhibit high responsivity and enhanced avalanche gain, demonstrating exciting opportunities for further development of Ga2O3-based electronics and optoelectronics.
CHINESE OPTICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Zhao Wang, Jun Lin, Xuan Wei, Wei Zheng, Qichang Hu
Summary: In this study, a heterojunction solar-blind UV detector with Gr/MZO/GaN structure was successfully fabricated by growing MZO films on the surface of p-GaN and introducing Gr as the window layer film. The device exhibited excellent detection ability for solar-blind UV light with high responsivity and external quantum efficiency. This work provides a reference for the application of Gr-based photodetectors.
FRONTIERS IN MATERIALS
(2021)
Article
Optics
Hengping Dong, Kunji Chen, Huafeng Yang, Zhongyuan Ma, Jun Xu, Wei Li, Linwei Yu, Xinfan Huang
Summary: This study proposes an all-silicon based a-SiNx:O/c-Si heterostructure solar-blind photodetector (SBPD) that overcomes the inherent contradiction between photoresponsivity and response speed in normal photoconductive-type PDs. The designed SBPD exhibits high responsivity and fast response speed, and the adopted materials and manufacturing processes are economical and compatible with mature technology, making it suitable for the development of cost-effective large-area SBPD arrays.
Article
Chemistry, Physical
Kai Qi, Shihao Fu, Yuefei Wang, Yurui Han, Rongpeng Fu, Chong Gao, Jiangang Ma, Haiyang Xu, Bingsheng Li, Aidong Shen, Yichun Liu
Summary: Mixed-phase (InxGa1_x)2O3 films were fabricated by excessive doping of In in Ga2O3 and controlling different precursor weight ratios of monoclinic Ga2O3 and cubic In2O3. These films exhibited coexistence of monoclinic (InxGa1_x)2O3 (& beta;-IGO) and cubic (InxGa1_x)2O3 (c-IGO). The photodetector based on (InxGa1_x)2O3 with a Ga2O3: In2O3 ratio of 10: 1 showed high sensitivity to solar-blind radiation with ultralow dark current and large responsivity and detectivity. The proposed alloying method has potential for future photoelectric devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yuan Qin, Li-Heng Li, Zhaoan Yu, Feihong Wu, Danian Dong, Wei Guo, Zhongfang Zhang, Jun-Hui Yuan, Kan-Hao Xue, Xiangshui Miao, Shibing Long
Summary: This study focuses on ultrahigh-performance metal-semiconductor-metal (MSM) solar-blind photodetectors (SBPDs) based on post-annealed amorphous (a-) Ga2O3, demonstrating superhigh sensitivity and response speed, as well as ultrahigh photo-to-dark current ratio and specific detectivity, indicating practicality for applications in solar-blind imaging, environmental monitoring, artificial intelligence, and machine vision.
Article
Engineering, Electrical & Electronic
Shihao Fu, Yuefei Wang, Yurui Han, Bingsheng Li, YunXiao Zhang, Jiangang Ma, Zhendong Fu, Haiyang Xu, Yichun Liu
Summary: High-quality beta-Ga2O3 films were prepared and metal-semiconductor-metal-structured photodetectors were constructed. The photodetectors exhibited high sensitivity in the solar-blind region, with a peak response at 254 nm and a cut-off wavelength around 266 nm. They also demonstrated a deep UV/visible light suppression effect and high light-dark current ratio, detectivity, and response time. The study also demonstrated a non-linear effect induced by avalanche ionization under a high electric field.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Materials Science, Multidisciplinary
H. Wang, J. Ma, L. Cong, D. Song, L. Fei, P. Li, B. Li, Y. Liu
Summary: In this work, dual-band ultraviolet photodetectors with peak responses at solar blind and near UV region were fabricated successfully, showing low dark current and high gain. These devices hold promise for developing high-performance dual-band photodetectors in the UV range.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Analytical
Daoqun Liu, Tingting Li, Bo Tang, Peng Zhang, Wenwu Wang, Manwen Liu, Zhihua Li
Summary: This paper designs and fabricates a silicon avalanche photodetector (APD) with a punch-through structure, which has the characteristics of low dark current, high multiplication gain, and low temperature coefficient. This high-performance device provides a promising solution for near-infrared weak light detection.
Article
Chemistry, Multidisciplinary
Jun Lin, Xiaozhang Chen, Xinpei Duan, Zhiming Yu, Wencheng Niu, Mingliang Zhang, Chang Liu, Guoli Li, Yuan Liu, Xingqiang Liu, Peng Zhou, Lei Liao
Summary: This study demonstrates ultra-low subthreshold swing (SS) and ultra-steep slope by integrating atomic-scale resistive filament with conventional MoS2 transistors. The nanoscale resistive filament ensures rapid device switching, leading to ultra-steep SS. The study also shows high on/off ratio and superior reproducibility and reliability. These findings provide exciting potential for future low-power electronics and monolithic integration.
Article
Engineering, Mechanical
Xiao Liang, Fang Zhang, Jinhui Jiang
Summary: This paper introduces a novel hierarchical metamaterial with ultra-broadband vibration suppression property through gradient design. Characterization of a one-dimensional outward-hierarchical lattice system and proposed two gradient design methods to overlap and merge bandgaps.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2022)
Article
Materials Science, Multidisciplinary
F. Xie, R. Yan, R. Wang, C. C. Bao, J. Wang
Summary: The designed AlGaN solar-blind avalanche photodiode shows improved optoelectronic characteristics compared to conventional APD, with significantly enhanced avalanche gain and reduced avalanche breakdown voltage, attributed to higher holes impact ionization coefficient and generated polarization electric field in the same direction as the applied bias field.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Instruments & Instrumentation
Andreas Bablich, Maurice Mueller, Rainer Bornemann, Andreas Nachtigal, Peter Haring Bolivar
Summary: In this study, massive nonlinearities in amorphous silicon p-i-n photodiodes enabled by photogating are presented, resulting in responsivities up to 744 mA/W at blue wavelengths. The detectors exhibit significant responsivity gains at optical modulation frequencies exceeding MHz and a more than 60-fold enhanced spectral response compared to the non-gated state. Electro-optical simulations verify photocarrier modulation due to defect-induced field screening to be the origin of such high responsivity gains. The experimental results validate the theory and enable the development of commercially viable and CMOS compatible high responsivity photodetectors operating in the visible range for low-light level imaging and detection.
Article
Nanoscience & Nanotechnology
Cunhua Xu, LiLi Lan, Zhao Wang, Peiwen Lv, Wei Zheng
Summary: In this study, AlSnO films were grown by the magnetron sputtering technique and different band gaps ranging from 4.40-5.43 eV were achieved. Solar-blind ultraviolet detectors were fabricated based on these films, demonstrating excellent spectral selectivity, detectivity, and narrow full widths at half-maximum in the response spectra. The fabrication of detectors via band gap engineering presented in this study can serve as a significant reference for researchers interested in solar-blind ultraviolet detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Hong-Xiang An, Bao-Shi Qiao, Zhi-Hong Zhang, Zhen-Dong Lian, Zhipeng Wei, Xiao-Shuang Li, Qing-Guang Zeng, Bo Wang, Kar Wei Ng, Shuang-Peng Wang
Summary: High-quality RbCu2I3 microwires were successfully synthesized by a fast-cooling hot saturated solution method. The microwires exhibited an orthorhombic structure with a smooth surface. Optical measurements showed sharp ultraviolet absorption and ultralarge Stokes shift (300 nm) in photoluminescence of RbCu2I3 microwires. The photodetector based on a single RbCu2I3 microwire demonstrated excellent ultraviolet detection performance, with a specific detectivity of 5.0 x 10(9) Jones and a responsivity of 380 mA center dot W-1. The synthesis method and physical properties of RbCu2I3 can guide the future optoelectronic application of this new material.
Review
Chemistry, Physical
Pengfei Zhou, Haoyun Bai, Jinxian Feng, Di Liu, Lulu Qiao, Chunfa Liu, Shuangpeng Wang, Hui Pan
Summary: Alkaline water electrolysis (AWE) is the most established technology for producing green hydrogen, but its high cost limits its market penetration. Developing low-cost and efficient electrocatalysts that can be produced on an industrial scale is crucial for improving the market share. Bulk Fe-based alloys are promising candidates due to their low cost, abundance, stability, and suitability for mass production. This review provides a comprehensive summary of recent strategies to enhance the catalytic activity of bulk Fe-based alloys and discusses their prospects in industrial AWE.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Pengfei Zhou, Po Kee Wong, Pengda Niu, Mingpeng Chen, Chi Tat Kwok, Yuxin Tang, Ruidi Li, Shuangpeng Wang, Hui Pan
Summary: Alkaline water electrolysis is a prospective method for green hydrogen production, but its efficiency is low. The use of anodized high-entropy alloy AlCoCrFeNi as an efficient electrode shows ultra-high catalytic activity and stability, making it suitable for industrial water electrolysis for hydrogen production.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Bao-Shi Qiao, Su-Yun Wang, Zhi-Hong Zhang, Zhen-Dong Lian, Zhi-Yao Zheng, Zhi-Peng Wei, Lin Li, Kar Wei Ng, Shuang-Peng Wang, Zhi-Bo Liu
Summary: Stacked 2D perovskites offer new possibilities for next generation photodetectors with enhanced features. This study demonstrates a bifunctional perovskite-based photovoltaic detector capable of demultiplexing two wavelengths. By utilizing the photosensitive and dielectric properties of 2D perovskite, the device exhibits different modes of operation. It shows continuous photoresponse under 405 nm and a transient spike response to longer wavelength visible light. This work provides a new strategy for multispectral detection and demultiplexing, which can improve data transfer rates and encrypted communications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jun Yan, Qi Zheng, Shuang-Peng Wang, Yong-Zhi Tian, Wei-Qiang Gong, Feng Gao, Ji-Jun Qiu, Lin Li, Shu-Hui Yang, Mao-Sheng Cao
Summary: High-efficiency electromagnetic functional materials are essential for high-performance electromagnetic absorbers and devices in various fields. Finding and realizing these materials pose great challenges.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Di Liu, Lulu Qiao, Yuyun Chen, Pengfei Zhou, Jinxian Feng, Chon Chio Leong, Kar Wei Ng, Shengjie Peng, Shuangpeng Wang, Weng Fai Ip, Hui Pan
Summary: In this study, the incorporation of manganese into the Co3O4 lattice is found to achieve high activity and selectivity in electrocatalytic nitrate reduction reaction (e-NO3RR). The Mn-incorporated Co3O4 nanotubes exhibit remarkable e-NO3RR activity with a high ammonia yield rate of 35 mg h-1 cm-2 and excellent selectivity with a Faraday efficiency for ammonia up to 99.5% in neutral media, outperforming transition-metal oxides.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Wushuang Han, Kewei Liu, Jialin Yang, Xing Chen, Qiu Ai, Yongxue Zhu, Zhen Cheng, Binghui Li, Lei Liu, Dezhen Shen
Summary: This study demonstrates a high-performance self-powered UV-visible photodetector enhanced by the ferroelectric effect on amorphous BaTiO3/p-Si heterojunction. The device achieves significantly improved responsivities of 14 mA/W, 27 mA/W, and 223 mA/W at 254 nm, 365 nm, and 600 nm, respectively, outperforming other BaTiO3-based self-driven photodetectors reported. The device also exhibits a fast response speed with rising/fall times of 450 μs/460 μs at 254 nm and 80 μs/140 μs at 600 nm. The defect-assisted recombination of photogenerated carriers at the amorphous BaTiO3/p-Si interface and grain boundaries enables the visualization of transient photocurrent spikes under 254 nm illumination. This work presents a novel strategy for the design and research of high-performance self-powered photodetectors.
APPLIED SURFACE SCIENCE
(2023)
Review
Engineering, Environmental
Mingpeng Chen, Di Liu, Lulu Qiao, Pengfei Zhou, Jinxian Feng, Kar Wei Ng, Qingju Liu, Shuangpeng Wang, Hui Pan
Summary: The dynamical processes in electrochemical reactions in electrocatalysis are not well understood, which leads to wasted efforts in the design of electrocatalysts. However, in-situ/operando Raman technique can provide guidance for the design of electrocatalysts. This review summarizes recent advances of in-situ/operando Raman studies in different electrocatalytic systems and their applications in understanding the mechanisms.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Di Liu, Jia Zhao, Youchao Kong, Haoqiang Ai, Haoyun Bai, Chon Chio Leong, Kin Ho Lo, Shuangpeng Wang, Weng Fai Ip, Sen Lin, Hui Pan
Summary: This study investigates the production of C2 fuels through the electrocatalytic carbon monoxide reduction reaction (e-CORR) using dual-atom catalysts (DACs). Methanol, ethanol, ethylene, and acetate can be produced on DAC-Co and DAC-Cu, but with different preferences. The presence of solvent enhances adsorption and influences the protonation steps, thus affecting the performance and selectivity of e-CORR on DACs.
Article
Chemistry, Physical
Xin Zhang, Hui Bao, Cuili Chen, Xian-Gang Wu, Menglin Li, Wenyu Ji, Shuangpeng Wang, Haizheng Zhong
Summary: The operational stability of red emissive CdSe QLEDs was investigated at different applied voltages. The device luminance quickly decreases when loaded around the turn-on voltage, but recovers after unloading or slight heat treatment, known as the fatigue effects of operational QLED. The decrease in device luminance is attributed to the reduction of quantum yield in quantum dots.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Hui Bao, Cuili Chen, Yongqi Cao, Shuai Chang, Shuangpeng Wang, Haizheng Zhong
Summary: In this study, the charge accumulation and recombination in an operational QLED were quantitatively determined using time-resolved electroluminescence (TREL) spectroscopy. Time-resolved current (TRC) measurement was introduced and simulated using an equivalent circuit model, including a series resistance, a parallel resistance, and a capacitance. The key processes in a typical TREL spectra were modeled, and the stages of delay, rising, and decay were correlated to charge accumulations, charge injection and recombination, and charge release and recombination, respectively. The electroluminescence recombination rate was derived by fitting the rising stage curves in the TREL spectra, providing an intrinsic parameter of the emissive materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Zhen Cheng, Kewei Liu, Baoshi Qiao, Jialin Yang, Xing Chen, Qiu Ai, Yongxue Zhu, Binghui Li, Lei Liu, Dezhen Shen
Summary: Heterojunctions consisting of hybrid organic-inorganic lead halide perovskites and other semiconductors have attracted attention for their potential application in photodetectors. However, their performance is limited by the low crystalline quality of perovskites and the difficulty in adjusting response spectra. This study successfully fabricated high quality CH3NH3PbCl3 micro-sized crystals on one side of individual ZnO microwires to form a heterojunction photodetector, which showed low dark current and rapid response speed. The modulation of response spectra and responsivity can be achieved by front or back illumination due to self-filtering properties, providing a promising method for high-performance heterojunction photodetectors.
Article
Nanoscience & Nanotechnology
Chenjing Zhao, Chunrong Zhu, Yue Yu, Wenhao Xue, Xiaoyun Liu, Fang Yuan, Jinfei Dai, Shuangpeng Wang, Bo Jiao, Zhaoxin Wu
Summary: By using 2-thiophenepropylamine bromide (ThPABr) as a multifunctional ligand in CsPbBr3 quantum dots, the film's photoluminescence quantum yield (PLQY) was increased to 83%, and the green LED exhibited significant performance improvement, including ultrahigh spectral stability, a maximum external quantum efficiency of 10.5%, and an extended operating lifetime that is 5 times longer than the reference sample.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Pengfei Zhou, Songbo Chen, Haoyun Bai, Chunfa Liu, Jinxian Feng, Di Liu, Lulu Qiao, Shuangpeng Wang, Hui Pan
Summary: In this study, a simple spontaneous corrosion and cyclic voltammetry (CV) activation method was used to fabricate Zn-incorporated NiFe layered double hydroxide (LDH) on commercial NiFe foam, which showed excellent oxygen evolution reaction (OER) performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Sujuan Wang, Ligan Qi, Zhonghui Xia, Wenhai Wang, Dewu Yue, Shuangpeng Wang, Shichen Su
Summary: In this study, a polarization-sensitive detector based on a MoTe2/WTe2 heterojunction was presented. It achieved wide spectral detection and high polarization sensitivity, showing potential for developing high-performance optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
