@article{Zuo2023, 
author = {Chuantian Zuo and Lixiu Zhang and Xiyan Pan and He Tian and Keyou Yan and Yuanhang Cheng and Zhiwen Jin and Chenyi Yi and Xiaoliang Zhang and Wu-Qiang Wu and Qinye Bao and Liyuan Han and Liming Ding},
title = {Perovskite films with gradient bandgap for self-powered multiband photodetectors and spectrometers},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {7},
pages = {10256-10262},
keywords = {interdiffusion, self-spreading, bandgap-graded perovskite, self-powered spectrometers, multiband photodetectors},
url = {https://www.sciopen.com/article/10.1007/s12274-023-5714-y},
doi = {10.1007/s12274-023-5714-y},
abstract = {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 MAPbCl3-MAPbBr3 and MAPbBr3-MAPbI3 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.}
}