University of Oulu

J. Mater. Chem. C, 2023,11, 10198-10204

MAPbBr3−nXn (X = Cl, I) single-crystal narrowband photodetectors for potential application in traffic light recognition

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Author: Liang, Feng-Xia1; Li, Shi-Fu2; Yu, Jie2;
Organizations: 1School of Microelectronics, Hefei University of Technology, Hefei, Anhui 230009, P. R. China
2School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, P. R. China
3Faculty of Medicine, Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu 90220, Finland
Format: article
Version: accepted version
Access: embargoed
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Language: English
Published: Royal Society of Chemistry, 2023
Publish Date: 2024-06-08


A narrowband photodetection system that can specifically distinguish green, yellow and red light has potential application in intelligent transportation systems. In this work, a series of MAPbBr3−nXn (X = Cl, I) single-crystal films with controllable thickness have been grown through space-limited inverse temperature crystallization. Filter-free narrowband photodetectors with peak responses at 505, 590 and 620 nm, corresponding to the green, yellow and red of traffic lights, are successfully achieved through the charge collection narrowing mechanism. The as-fabricated narrowband photodetectors demonstrate superior performance, with full width at half-maximum all less than 35 nm, a maximum responsivity of 182 mA W−1, and specific detectivity of 9.68 × 10¹⁰ Jones. Finally, a traffic light recognition assembly based on the three narrowband photodetectors is constructed. The photocurrent of the photodetector is approximately five to ten times that of the interference from other light sources, indicating good color recognition capability for traffic lights.

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Series: Journal of materials chemistry. C, Materials with applications in optical, magnetic & electronic devices
ISSN: 2050-7526
ISSN-E: 2050-7534
ISSN-L: 2050-7526
Volume: 11
Issue: 30
Pages: 10198 - 10204
DOI: 10.1039/D3TC01236K
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work was supported by the National Natural Science Foundation of China (NSFC, no. 62074048, 61675062 and 62311530047), the Fundamental Research Funds for the Central Universities under Grant PA2020GDKC0014, Grant JZ2022HGQA0185 and Grant JZ2018HGXC0001, the Key Research and Development Plan of Anhui Province under Grant 2022f04020007, the Key Project of Natural Science Research in Universities of Anhui Province under Grant KJ2020A0536, and the Postgraduate Academic Innovation Project of Anhui Province under Grant 2022xscx014.
Copyright information: © The Royal Society of Chemistry 2023.