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Reverse Bias Behavior of Halide Perovskite Solar Cells
Author(s) -
Bowring Andrea R.,
Bertoluzzi Luca,
O'Regan Brian C.,
McGehee Michael D.
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702365
Subject(s) - perovskite (structure) , materials science , reverse bias , halide , diffusion , stability (learning theory) , degradation (telecommunications) , quantum tunnelling , chemical physics , optoelectronics , chemical engineering , inorganic chemistry , chemistry , physics , thermodynamics , computer science , diode , engineering , telecommunications , machine learning
The future commercialization of halide perovskite solar cells relies on improving their stability. There are several studies focused on understanding degradation under operating conditions in light, but little is known about the stability of these solar cells under reverse bias conditions. Reverse bias stability is important because shaded cells in a module are put into reverse bias by the illuminated cells. In this paper, a phenomenological study is presented of the reverse bias behavior of halide perovskite solar cells and it is shown that reverse bias can lead to a partially recoverable loss in efficiency, primarily caused by a decrease in V OC . A general mechanism is proposed, supported by drift–diffusion simulations, to explain how these cells breakdown via tunneling caused by accumulated ionic defects and suggests that the reversible loss in efficiency may be due to an electrochemical reaction of these defects. Finally, the implications of these phenomena are discussed and how they can possibly be addressed is also discussed.