Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Organic–inorganic halide perovskites have been studied intensively in recent years, for applications in solar cells. Many studies have been reported on the light-induced phenomena for Organic–inorganic halide perovskite materials and solar cells until now. We investigate the light-induced degradation of organic–inorganic halide perovskite solar cells, using multiple techniques as follows: microwave photoconductivity decay, impedance spectroscopy, and hard X-ray photoemission spectroscopy.
From the results of microwave photoconductivity decay measurements for device-quality perovskite films, the comparably long bulk lifetime and low surface recombination velocity were determined. In addition, the damage into the perovskites by stacking another layers was clearly detected.
Under light illumination and dark condition (after light-induced degradation), characteristic impedance responses were observed for a highly damaged sample. From Warburg impedance analysis, large ionic diffusion coefficients were determined, suggesting iodine ion diffusion.
Hard X-ray photoemission spectroscopy revealed the change in chemical bonding states before and after light-induced degradation. The light-induced phenomena based on these data will be discussed.
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