Fast response CdS-CdSxTe1-x-CdTe core-shell nanobelt photodetector

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2018,（17）
• 页码范围: 1118-1124
• 页数: 7页
• 语种: 英文

摘要

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 μs,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 (～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.