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From BiI3 to CuBiI4: a striking improvement in the photoelectric performance of a novel photodetector candidate

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Abstract

Bismuth halide based semiconductors have attracted increasing attention as the next generation photodetectors because of their excellent photoelectric performance, environmental friendliness, and high-element-abundance characteristics. However, it is still challenging to prepare a thin film under normal conditions because of the instability of BiI3. In this work, we use a room temperature elemental powder reaction in ambient conditions for the easy preparation of Cu incorporated perovskite-like CuBiI4 on a large scale. The crystalline and photoelectric characteristics of the resulting CuBiI4 thin films with different initial Cu content have been investigated by X-ray diffraction (XRD), UV-Vis spectroscopy, photoluminescence spectroscopy (PL), and transient surface photovoltage (TSPV) studies. The CuBiI4 based photodetectors were first assembled, which showed a striking improvement in the responsivity of the photodetectors compared with pure binary BiI3. Particularly, the responsivity of the photodetector with a 1 : 1 molar ratio of copper to bismuth is 106 times larger than that with an initial molar ratio of 0 : 1 (pure BiI3). A possible mechanism for such an improvement was preliminarily discussed by taking advantage of the Hall effect measurements. Our work not only provides a universal synthetic strategy for preparing high quality Bi-based perovskite-like photoelectric materials but also presents a novel Bi-based photodetector material.

Graphical abstract: From BiI3 to CuBiI4: a striking improvement in the photoelectric performance of a novel photodetector candidate

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Supplementary files

Article information


Submitted
07 Mar 2020
Accepted
15 May 2020
First published
18 May 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

From BiI3 to CuBiI4: a striking improvement in the photoelectric performance of a novel photodetector candidate

N. Qu, Y. Lei, X. Yang, X. Hu, W. Zhao, C. Zhao and Z. Zheng, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01188F

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