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Perovskite films with gradient bandgap for self-powered multiband photodetectors and spectrometers

Nano Research, ISSN: 1998-0000, Vol: 16, Issue: 7, Page: 10256-10262
2023
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Article Description

Bandgap-graded materials present varying spectral responses at different positions, making them possible to be used as an alternative to photoactive materials array in multi-spectral responsive devices, thus miniaturizing the apparatus. However, the preparation of bandgap-graded materials usually requires complicated deposition process. Here we report a facile low-temperature solution process to make films with lateral bandgap gradients, which form spontaneously via self-spreading and interdiffusion of solutions. We show lead halide perovskite films with MAPbCl−MAPbBr and MAPbBr−MAPbI gradients, which exhibit light absorption onsets ranging from 410 to 781 nm. The bandgap-graded films were used to make self-powered multiband photodetectors, which show different spectral responses at different positions without applying bias voltage. Furthermore, self-powered spectrometers were made by using the multiband photodetectors. [Figure not available: see fulltext.].

Bibliographic Details

Chuantian Zuo; Lixiu Zhang; Xiyan Pan; Liming Ding; Qinye Bao; He Tian; Keyou Yan; Yuanhang Cheng; Zhiwen Jin; Chenyi Yi; Xiaoliang Zhang; Wu Qiang Wu; Liyuan Han

Tsinghua University Press

Physics and Astronomy; Materials Science; Engineering

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