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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47518

Title: Ultrahigh-sensitivity CdS photoconductors with instant response and ultralow power consumption for detection in low-light environments
Authors: Yen-Pei Luc
Keng-Te Lin
Shao-Chin Tseng
Hsuen-Li Chen
Yu-Sheng Lai
Szu-Huang Chen
Yi-Chuan Tseng
Ting-Wei Chu
Ming-Yu Linc
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2013-05
Issue Date: 2018-07-31T03:54:57Z
Publisher: Journal of Materials Chemistry C
Abstract: Abstract: In this study we describe a low-cost cadmium sulfide (CdS) photoconductor that behaves as a highly sensitive and rapidly responding detector toward low-intensity light. Through the observation of TEM images and analysis of micro-Raman spectra, the degree of crystallization of CdS films increased and their dislocation defects were removed effectively after treatment with several shots from a KrF excimer laser. Such laser treatment of CdS photoconductors could be conducted in air and completed within a few seconds. At a very low bias voltage of 1 mV, the laser-treated CdS device provided a record high responsivity of 7200 A W−1 and a detectivity of 1015 Jones. In addition, at a normal bias voltage of 1 V, it displayed an extremely high responsivity of 7 × 106 A W−1 and a detectivity of 6 × 1016 Jones. The measured response time of the laser-annealed CdS device from the dark to illumination at 10−2 fW μm−2 was only 40 ms—much faster than the shutter speed or exposure time required for a professional digital camera for such low-light image detection. Accordingly, KrF laser annealing is a simple and rapid process that can significantly enhance the low-light detection properties of CdS, a commercial photoconductor. Our strategy proposed herein appears to hold great potential for ultralow-light image detection with ultralow power consumption.
Relation: 1(27) pp.4244-4251
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47518
Appears in Collections:[光電科學研究所] 期刊論文

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