Issue 6, 2022

Tailoring capping-layer composition for improved stability of mixed-halide perovskites

Abstract

Incorporating a low dimensional (LD) perovskite capping layer on top of a perovskite absorber, improves the stability of perovskite solar cells (PSCs). However, in the case of mixed-halide perovskites, which can undergo halide segregation into single-halide perovskites, a systematic study of the capping layer's effect on mixed-halide perovskite absorber is still lacking. This study bridges this gap by investigating how the 1D perovskite capping layers on top of MAPb(IxBr1−x)3 (x = 0, 0.25, 0.5, 0.75, 1) absorbers affect the films' stability. We utilize a new method, dissimilarity matrix, to investigate the image-based stability performance of capping-absorber pair compositions across time. This method overcomes the challenge of analyzing various film colors due to bandgap difference in mixed-halide perovskites. We also discover that the intrinsic absorber stability plays an important role in the overall stability outcome, despite the capping layer's support. Within the 55 unique capping-absorber pairs, we observe a notable 1D perovskite material, 1-methoxynaphthalene-2-ethylammonium chloride (2MeO–NEA–Cl or 9-Cl), that improves the stability of MAPbI3 and MAPb(I0.5Br0.5)3 by at least 8 and 1.5 times, respectively, compared to bare films under elevated humidity and temperature. Surface photovoltage results also show that the accumulation of electrostatic charges on the film surface depends on the capping layer type, which could contribute to the acceleration/deceleration of degradation.

Graphical abstract: Tailoring capping-layer composition for improved stability of mixed-halide perovskites

Supplementary files

Article information

Article type
Paper
Submitted
13 set 2021
Accepted
13 dez 2021
First published
21 dez 2021
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2022,10, 2957-2965

Tailoring capping-layer composition for improved stability of mixed-halide perovskites

N. T. P. Hartono, M. Tremblay, S. Wieghold, B. Dou, J. Thapa, A. Tiihonen, V. Bulovic, L. Nienhaus, S. R. Marder, T. Buonassisi and S. Sun, J. Mater. Chem. A, 2022, 10, 2957 DOI: 10.1039/D1TA07870D

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