Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Understanding the stability of organo-lead trihalide perovskite materials and photovoltaic devices.
Saif A. Haque
Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
There is currently tremendous interest in the application of methyl ammonium lead trihalide (e.g. MeNH3PbI3) perovskite materials for a wide range of electrical and optoelectronic devices such as transistors, light emitting diodes and solar cells. In recent years, spectacular advances have been made in the power conversion efficiency of perovskite solar cells with recent reports of devices exhibiting PCE’s over 20%. However, the relatively low stability of this technology still remains a concern. A number of factors have been shown to influence the stability of perovskite materials; these include water, UV and temperature. In this talk I will consider the affect of light and oxygen on the stability of perovskite materials and devices [1, 2]. I will first consider the effect of light and oxygen on the absorption properties of the films, device performance / stability and photo-induced charge separation yields. I will then go onto discuss the mechanism of how light and oxygen causes degradation of the perovskite absorber. In particular, I will present data that reveals that the degradation is induced by a photo-generated reactive oxygen species. In the final part of the talk I will outline strategies that can be used to reduce the severity of light and oxygen degradation in perovskite materials and devices via structural modification of perovskite absorber itself and supporting device architecture.
References:
[1] O’Mahony et al. J. Mater. Chem. A. 2015, 3,7219 –7223.
[2] Aristidou et al. Angew. Chemie. Int. Ed. 2015, 54,8208 –8212
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