Unravelling the Effect of Crystal Structure on Degradation of Methylammonium Lead Halide Perovskite.

Author(s) Dhamaniya, B.Pratap; Chhillar, P.; Roose, B.; Dutta, V.; Pathak, S.
Journal ACS Appl Mater Interfaces
Date Published 2019 May 30

Despite the remarkable efficiencies of perovskite solar cells, moisture instability has still been the major constrain in the technology deployment. Although, some research groups have discussed the possible mechanisms involved in the perovskite degradation, but still no broader understanding has been developed so far. Here, we demonstrate that the crystal orientation of perovskite film plays a major role in its degradation. We observed that the films fabricated via different routes led to different degradation behaviour and unravelled that diversity in degradation rate arises due to the difference in crystallographic characteristics of the films. Using optical and electrical measurements, we show that the film prepared via single step (lead chloride based) route undergoes at much faster degradation rate as compared to films prepared using single step (acetate based) and two-step (or sequential deposition) routes. Although, the resulting film is MAPbI3 regardless of processing via different routes, however, their respective crystal orientation is different. In this manuscript we correlate crystal orientation of MAPbI3 with their degradation pattern. Our studies also suggest a possible way to make stable perovskite film.

DOI 10.1021/acsami.9b00831
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2019.

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