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Research Article

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

Chuantian Zuo1,11, Lixiu Zhang1, Xiyan Pan1, He Tian3, Keyou Yan4, Yuanhang Cheng5, Zhiwen Jin6, Chenyi Yi7, Xiaoliang Zhang8, Wu-Qiang Wu9, Qinye Bao2( ), Liyuan Han10, Liming Ding1 ( )
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China
School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
School of Integrated Circuits, Tsinghua University, Beijing 100084, China
School of Environment and Energy, South China University of Technology, Guangzhou 510000, China
School of New Energy, Nanjing University of Science and Technology, Jiangyin 214443, China
School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
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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.

Graphical Abstract

Perovskite films with gradient bandgap were made by using a facile solution interdiffusion method. Self-powered multiband photodetectors and spectrometers were fabricated by using the bandgap-graded perovskite films.

Keywords

self-spreadinginterdiffusionbandgap-graded perovskitemultiband photodetectorsself-powered spectrometers

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 10256-10262
DOI: 10.1007/s12274-023-5714-y

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Cite this article:
Zuo C, Zhang L, Pan X, et al. Perovskite films with gradient bandgap for self-powered multiband photodetectors and spectrometers. Nano Research, 2023, 16(7): 10256-10262. https://doi.org/10.1007/s12274-023-5714-y
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Received: 06 February 2023
Revised: 28 March 2023
Accepted: 05 April 2023
Published: 29 April 2023
© Tsinghua University Press 2023