Issue 25, 2022

Uniaxially oriented FAxMA1−xPbI3 films with low intragrain and structural defects for self-powered photodetectors

Abstract

Metal halide perovskite films are promising candidates for applications in self-powered photodetectors owing to their astonishing photoelectric properties. Intragrain and structural defects present in the films can easily cause significant energy loss via carrier non-radiative recombination. Herein, a synergetic strategy of composition engineering and crystal engineering is developed for fabrication of (110)-uniaxially oriented FA0.2MA0.8PbI3 films on different substrates based on the pressure-induced fusion growth mechanism. The resulting composition-optimized films are composed of large grains with an average lateral size of 5 μm (on the SnO2 layer) and even 30.8 μm (directly on the Si substrate). Meanwhile, films with different thicknesses (0.2–1.5 μm) exhibit a single-crystal-like surface and single-crystal penetration across the film thickness, realizing lower trap densities, longer carrier lifetimes and excellent environmental stability. The corresponding perovskite self-powered photodetector presents a giant responsivity under white light (470 mA W−1 at 770 nm) and laser light (512 mA W−1, 671 nm) simultaneously. Moreover, the device exhibits markedly improved environmental stability, reproducibility, and a fast response.

Graphical abstract: Uniaxially oriented FAxMA1−xPbI3 films with low intragrain and structural defects for self-powered photodetectors

Supplementary files

Article information

Article type
Paper
Submitted
08 Mar 2022
Accepted
23 May 2022
First published
25 May 2022

J. Mater. Chem. C, 2022,10, 9546-9553

Uniaxially oriented FAxMA1−xPbI3 films with low intragrain and structural defects for self-powered photodetectors

L. Zhang, T. Zhang, Y. Gao, D. Cui, Q. Wang, G. Lian, H. Yu, H. Zhang and C. Wong, J. Mater. Chem. C, 2022, 10, 9546 DOI: 10.1039/D2TC00938B

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