Fabrication visible-blind ultraviolet photodetector based on ZnS/GaN heterostructure with fast response

2020 ◽  
Vol 10 (5) ◽  
pp. 629-633
Author(s):  
Yong Wang ◽  
Naisen Yu
Keyword(s):  
Magnetron Sputtering ◽  
Low Cost ◽  
Response Speed ◽  
Fast Response ◽  
Ultraviolet Photodetector ◽  
Radio Frequency Magnetron Sputtering ◽  
Uv Detectors ◽  
Heterojunction Structure ◽  
Gan Heterostructure ◽  
Visible Blind

In this paper, visible-blind ultraviolet (UV) detectors based on a ZnS/p-GaN heterojunction structure were fabricated. The heterojunction structure was composed of a ZnS nanostructure deposited on a p-GaN/sapphire substrate. The ZnS nanostructured component was obtained via radio-frequency magnetron sputtering. The device based on this ZnS/p-GaN heterojunction structure showed a reproducible, stable, and fast response speed. Therefore, the results demonstrated that the ZnS/p-GaN heterojunction was successfully fabricated using this relatively low-cost method.

Enhanced UV Photon-response of Tin Nano Cluster Loaded- laser Irradiated ZnO Thin film detector

2011 ◽  
Vol 1288 ◽  
Author(s):  
Rashmi Menon ◽  
K. Sreenivas ◽  
Vinay Gupta
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Surface States ◽  
Response Speed ◽  
Rf Magnetron Sputtering ◽  
Fast Response ◽  
Zno Thin Films ◽  
Zno Thin Film ◽  
Photo Response

ABSTRACTZinc Oxide (ZnO), II-VI compound semiconductor, is a promising material for ultraviolet (UV) photon sensor applications due to its attractive properties such as good photoconductivity, ease processing at low temperatures and excellent radiation hardness. The rf magnetron sputtering is a suitable deposition technique due to better control over stoichiometry and deposition of uniform film. Studies have shown that the presence of surface defects in ZnO and subsequently their passivation are crucial for enhanced photo-response characteristics, and to obtain the fast response speed. Worldwide efforts are continuing to develop good quality ZnO thin films with novel design structures for realization of an efficient UV photon sensor. In the present work, UV photon sensor is fabricated using a ZnO thin films deposited by rf magnetron sputtering on the corning glass substrate. Photo-response, (Ion/Ioff) of as-grown ZnO film of thickness 100 nm is found to be 3×103 with response time of 90 ms for UV intensity of 140 μW/cm2 (λ = 365 nm). With irradiation on ZnO thin film by pulsed Nd:YAG laser (forth harmonics 266 nm), the sensitivity of the UV sensor is found to enhance. The photo-response increases after laser irradiation to 4x104 with a fast response speed of 35 ms and attributed to the change in surface states and the native defects in the ZnO thin film. Further, enhancement in the ultraviolet (UV) photo-response (8×104) of detector was observed after integrating the nano-scale islands of Sn metal on the surface of laser irradiated ZnO thin film.

Design of the PTO/PZO Ferroelectric Superlattice Assembly

2012 ◽  
Vol 512-515 ◽  
pp. 1296-1299
Author(s):  
Tuo Hu ◽  
Cheng Zhang ◽  
Na Zhang
Keyword(s):  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Absorption Spectra ◽  
Low Cost ◽  
Radio Frequency Magnetron ◽  
Radio Frequency Magnetron Sputtering ◽  
Non Destructive

A series of ferroelectric superlattice films on ITO substrates have been artificially fabricated by radio frequency magnetron sputtering, starting from the PbZrO3 (PZO) and PbTiO3 (PTO) matrix targets. The design sequence of the layers has been changed via shifting sputtering target in the preparing processes. Diverse systems have been shaped and discussed by XRD, SEM and UV-Vis. UV-Vis absorption spectra have been paid more attention especially, due to the low-cost and non-destructive method to provide the information about the thicknesses of the films.

A flexible ultraviolet photodetector based on single crystalline MoO3 nanosheets

2015 ◽  
Vol 3 (28) ◽  
pp. 7469-7475 ◽  
Author(s):  
Qinghong Zheng ◽  
Jin Huang ◽  
Shilin Cao ◽  
Haili Gao
Keyword(s):  
Response Speed ◽  
Fast Response ◽  
Mechanical Forces ◽  
Ultraviolet Photodetector ◽  
Uv Photodetector ◽  
Single Crystalline ◽  
Spectral Selectivity ◽  
Excellent Stability

A flexible UV photodetector was fabricated based on highly crystalline MoO3 nanosheets. The photodetector exhibits high UV spectral selectivity, excellent stability, fast response speed and is able to bear significant external mechanical forces.

Ultraviolet Photodetector Based on a MgZnO Film Grown by Radio-Frequency Magnetron Sputtering

2009 ◽  
Vol 1 (11) ◽  
pp. 2428-2430 ◽  
Author(s):  
Yanmin Zhao ◽  
Jiying Zhang ◽  
Dayong Jiang ◽  
Chongxin Shan ◽  
Zhenzhong Zhang ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Radio Frequency Magnetron ◽  
Ultraviolet Photodetector ◽  
Radio Frequency Magnetron Sputtering ◽  
Mgzno Film

Development of an Over-Temperature Supervising System of Switch Cabinet Based on Gas Sensing Technology

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
Jian Le ◽  
Qian Zhou ◽  
Cao Wang ◽  
Zhi-chun Yang ◽  
Hao Zhang
Keyword(s):  
Field Experiments ◽  
Gas Sensing ◽  
High Reliability ◽  
Low Cost ◽  
Special Kind ◽  
Response Speed ◽  
Fast Response ◽  
Storage Unit ◽  
Sensing Technology ◽  
Temperature State

Abstract Existing over-temperature supervising (OTS) systems available for switch cabinet, even those based on advanced optical fiber sensing technology, are unable to satisfy the critical requirements such as reliability, safety, practicability and economy simultaneously. In this paper, a novel OTS scheme that take a special kind of gas to carry the signal indicating the over-temperature state of a switch cabinet is developed elaborately. Serving for the CO2 gas which has comprehensive and overwhelming superiorities in situation of OTS, a gas storage unit that is composed of a hard plastic crust and an inner tubular airbag, a gas releasing mechanism that consists of bimetallic and acupuncture, and a gas sensing terminal are designed artfully. The overall OTS system is finally developed by integrating these three parts with a background server via wireless communication technology. The advantages of the proposed system, such as high reliability and safety, fast response speed and universal applicability have been proven by lab tests and field experiments. Moreover, the inherent low cost and easy installation and maintenance features of our scheme facilitate the development of OTS systems for other electrical devices in power system.

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