scholarly journals Simultaneously improved sensitivity and response speed of β-Ga2O3 solar-blind photodetector via localized tuning of oxygen deficiency

2019 ◽  
Vol 114 (11) ◽  
pp. 113506 ◽  
Author(s):  
L. X. Qian ◽  
H. Y. Liu ◽  
H. F. Zhang ◽  
Z. H. Wu ◽  
W. L. Zhang
Keyword(s):  
Oxygen Deficiency ◽  
Response Speed ◽  
Solar Blind

scholarly journals Single-layer graphene electrode enhanced sensitivity and response speed of β-Ga2O3 solar-blind photodetector

2019 ◽  
Vol 9 (3) ◽  
pp. 1394 ◽  
Author(s):  
Han Wu ◽  
Yuanqi Huang ◽  
Yusong Zhi ◽  
Xia Wang ◽  
Xulong Chu ◽  
...  
Keyword(s):  
Single Layer ◽  
Response Speed ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Graphene Electrode ◽  
Enhanced Sensitivity ◽  
Solar Blind

scholarly journals Solar-blind deep-ultraviolet photodetectors based on solution-synthesized quasi-2D Te nanosheets

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2459-2466 ◽  
Author(s):  
Rui Cao ◽  
Ye Zhang ◽  
Huide Wang ◽  
Yonghong Zeng ◽  
Jinlai Zhao ◽  
...  
Keyword(s):  
Response Speed ◽  
Fast Response ◽  
Pollution Monitoring ◽  
Practical Applications ◽  
Ambient Exposure ◽  
Photoelectric Properties ◽  
Solar Blind ◽  
Deep Ultraviolet ◽  
Viable Approach ◽  
Ultraviolet Photodetectors

AbstractSolar-blind deep ultraviolet (DUV) photodetectors with high responsivity (R) and fast response speed are crucial for practical applications in astrophysical analysis, environmental pollution monitoring, and communication. Recently, 2D tellurium has emerged as a potential optoelectronic material because of its excellent photoelectric properties. In this study, solar-blind DUV photodetectors are demonstrated based on solution-synthesized and air-stable quasi-2D Te nanosheets (Te NSs). An R of 6.5 × 104 A/W at 261 nm and an external quantum efficiency (EQE) of higher than 2.26 × 106% were obtained, which are highest among most other 2D material-based solar-blind DUV photodetectors. Moreover, the photoelectric performance of the quasi-2D Te-based photodetector exhibited good stability even after ambient exposure for 90 days without any encapsulation. These results indicate that quasi-2D Te NSs provide a viable approach for developing solar-blind DUV photodetectors with ultrahigh R and EQE.

Self-powered solar-blind ZnGa2O4 UV photodetector with ultra-fast response speed

2020 ◽  
Vol 315 ◽  
pp. 112354 ◽  
Author(s):  
Dongyang Han ◽  
Kewei Liu ◽  
Qichao Hou ◽  
Xing Chen ◽  
Jialin Yang ◽  
...  
Keyword(s):  
Response Speed ◽  
Fast Response ◽  
Uv Photodetector ◽  
Solar Blind ◽  
Self Powered

Room-Temperature Fabricated Amorphous Ga2 O3 High-Response-Speed Solar-Blind Photodetector on Rigid and Flexible Substrates

2017 ◽  
Vol 5 (19) ◽  
pp. 1700454 ◽  
Author(s):  
Shujuan Cui ◽  
Zengxia Mei ◽  
Yonghui Zhang ◽  
Huili Liang ◽  
Xiaolong Du
Keyword(s):  
Room Temperature ◽  
Response Speed ◽  
High Response ◽  
Flexible Substrates ◽  
Solar Blind

scholarly journals A self-powered solar-blind ultraviolet photodetector based on a Ag/ZnMgO/ZnO structure with fast response speed

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13092-13096 ◽  
Author(s):  
Ming-Ming Fan ◽  
Ke-Wei Liu ◽  
Xing Chen ◽  
Zhen-Zhong Zhang ◽  
Bing-Hui Li ◽  
...  
Keyword(s):  
Response Speed ◽  
Fast Response ◽  
Ultraviolet Photodetector ◽  
Uv Photodetectors ◽  
Solar Blind ◽  
Self Powered

Realization of Ag/ZnMgO/ZnO photodetectors provides a feasible route to develop self-powered solar-blind UV photodetectors with fast response speed.

scholarly journals Design of a Sandwich Hierarchically Porous Membrane with Oxygen Supplement Function for Implantable Glucose Sensor

2020 ◽  
Vol 10 (8) ◽  
pp. 2848 ◽  
Author(s):  
Lijuan Huang ◽  
Ziru Jia ◽  
Hongying Liu ◽  
Xitian Pi ◽  
Jiawen Zhou
Keyword(s):  
Glucose Sensor ◽  
Oxygen Deficiency ◽  
Response Speed ◽  
Relative Sensitivity ◽  
Porous Membrane ◽  
Glucose Sensors ◽  
Hierarchically Porous ◽  
Rapid Responses ◽  
Oxygen Supplement ◽  
Module Development

This study aims to develop an oxygen regeneration layer sandwiched between multiple porous polyurethanes (PU) to improve the performance of implantable glucose sensors. Sensors were prepared by coating electrodes with platinum nanoparticles, Nafion, glucose oxidase and sandwich hierarchically porous membrane with an oxygen supplement function (SHPM-OS). The SHPM-OS consisted of a hierarchically porous structure synthesized by polyethylene glycol and PU and a catalase (Cat) layer that was coated between hierarchical membranes and used to balance the sensitivity and linearity of glucose sensors, as well as reduce the influence of oxygen deficiency during monitoring. Compared with the sensitivity and linearity of traditional non-porous (NO-P) sensors (35.95 nA/mM, 0.9987, respectively) and single porous (SGL-P) sensors (45.3 nA /mM, 0.9610, respectively), the sensitivity and linearity of the SHPM-OS sensor was 98.45 nA/mM and 0.9989, respectively, which was more sensitive with higher linearity. The sensor showed a response speed of five seconds and a relative sensitivity of 90% in the first 10 days and remained 78% on day 20. This sensor coated with SHPM-OS achieved rapid responses to changes of glucose concentration while maintaining high linearity for long monitoring times. Thus, it may reduce the difficulty of back-end hardware module development and assist with effective glucose self-management for people with diabetes.

Surface reconstructions of (001) cleaved GdBa2Cu3O7-δ

1992 ◽  
Vol 50 (1) ◽  
pp. 106-107
Author(s):  
H.W. Zandbergen ◽  
M.R. McCartney
Keyword(s):  
Electron Microscopy ◽  
Copper Oxide ◽  
Grain Boundaries ◽  
Atomic Structure ◽  
Oxygen Deficiency ◽  
Surface Layers ◽  
Layer Sequence ◽  
Surface Reconstructions ◽  
Good Agreement

Very few electron microscopy papers have been published on the atomic structure of the copper oxide based superconductor surfaces. Zandbergen et al. have reported that the surface of YBa2Cu3O7-δ was such that the terminating layer sequence is bulk-Y-CuO2-BaO-CuO-BaO, whereas the interruption at the grain boundaries is bulk-Y-CuO2-BaO-CuO. Bursill et al. reported that HREM images of the termination at the surface are in good agreement with calculated images with the same layer sequence as observed by Zandbergen et al. but with some oxygen deficiency in the two surface layers. In both studies only one or a few surfaces were studied.

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