Open AccessOptical characterization of voltage-accelerated degradation in CH_3NH_3PbI_3 perovskite solar cells
Author(s) -
Taketo Handa,
David M. Tex,
Ai Shimazaki,
Tomoko Aharen,
Atsushi Wakamiya,
Yoshihiko Kanemitsu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.00a917
Subject(s) - photoluminescence , perovskite (structure) , electroluminescence , materials science , degradation (telecommunications) , optoelectronics , biasing , optics , energy conversion efficiency , voltage , layer (electronics) , chemistry , nanotechnology , electronic engineering , physics , quantum mechanics , engineering , crystallography
We investigate the performance degradation mechanism of CH 3 NH 3 PbI 3 perovskite solar cells under bias voltage in air and nitrogen atmospheres using photoluminescence and electroluminescence techniques. When applying forward bias, the power conversion efficiency of the solar cells decreased significantly in air, but showed no degradation in nitrogen atmosphere. Time-resolved photoluminescence measurements on these devices revealed that the application of forward bias in air accelerates the generation of non-radiative recombination centers in the perovskite layer buried in the device. We found a negative correlation between the electroluminescence intensity and the injected current intensity in air. The irreversible change of the perovskite grain surface in air initiates the degradation of the perovskite solar cells.