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-CdS_xTe_1−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, CdS_xTe_1−x and CdTe. The measured response spectrum of CdS-CdS_xTe_1−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.

基于准一维半导体纳米结构的光电探测器显示出高灵敏度，但由于表面反应而响应速度慢。在这里，我们报告了一种快速响应的 CdS-CdS _x Te _{1− x} -CdTe 核壳纳米带光电探测器，其上升时间为 11 μs，这是之前报道的基于 CdS 的光电探测器中最快的。_{提高的响应速度归因于抑制了由 CdS、CdS x} Te _{1− x}和 CdTe之间的核壳结构和异质结引起的表面反应的可能性。CdS-CdS _x Te _{1− x的实测响应谱}-CdTe核壳纳米带光电探测器覆盖355至785 nm的宽范围。此外，还获得了高响应度 (1,520 A/W) 和大 3 dB 带宽 (∼22.9 kHz) 以及快速响应。响应率、灵敏度、光谱响应和光响应速度方面的高性能使该器件成为光学传感、通信和成像实际应用的有希望的候选者。