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2. Optical characterization of voltage-accelerated degradation in CH_3NH_3PbI_3 perovskite solar cells

Author

Atsushi Wakamiya, Tomoko Aharen, David M. Tex, Yoshihiko Kanemitsu, Taketo Handa, and Ai Shimazaki

Subjects
Photoluminescence, Materials science, business.industry, Photovoltaic system, Energy conversion efficiency, Biasing, 02 engineering and technology, Electroluminescence, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, law.invention, Optics, Solar cell efficiency, law, Optoelectronics, 0210 nano-technology, business, Perovskite (structure), Light-emitting diode
Abstract

We investigate the performance degradation mechanism of CH3NH3PbI3 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.

Published
2016

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