期刊
SCIENCE BULLETIN
卷 63, 期 17, 页码 1118-1124出版社
SCIENCE PRESS
DOI: 10.1016/j.scib.2018.08.003
关键词
CdS-CdSxTe1-x-CdTe; Core-shell; Photodetector; Fast response
资金
- National Natural Science Foundation of China [51672245, 61735017]
- National Key Basic Research Program of China [2015CB352003]
- Zhejiang Provincial Natural Science Foundation of China [R17F050003]
- Fundamental Research Funds for the Central Universities
- Program for Zhejiang Leading Team of ST Innovation
Quasi-one-dimensional semiconductor nanostructure-based photodetectors show high sensitivity but suffer from slow response speed due to surface reaction. Here, we report a fast-response CdS-CdSxTe1-x-CdTe core-shell nanobelt photodetector with a rise time of 11 mu s, which is the fastest among CdS based photodetectors reported previously. The improved response speed is ascribed to the suppressed possibilities of surface reaction resulting from the core-shell structure and heterojunction among the CdS, CdSxTe1-x and CdTe. The measured response spectrum of CdS-CdSxTe1-x-CdTe core-shell nanobelt photodetector covers a wide range from 355 to 785 nm. Moreover, high responsivity (1,520 A/W) and large 3 dB bandwidth (similar to 22.9 kHz) are obtained along with the fast response. The high performance in responsivity, sensitivity, spectral response and photoresponse speed makes this device a promising candidate for practical application in optical sensing, communication and imaging. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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