Surface Passivation of Organometal-Halide Perovskite Solar Cells
Antonio Abate a, Henry Snaith a
a University of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Ecublens, Switzerland, 2014 May 11th - 14th
Organizers: Michael Graetzel and Mohammad Nazeeruddin
Poster, Antonio Abate, 040
Publication date: 1st March 2014

Organometal trihalide perovskites, such as CH3NH3Pb X3 (X = I-, Br-, Cl-), are attracting growing interest to prepare low cost solar cells that are capable of converting sun light to electricity at the highest efficiencies.  Despite negligible effort on enhancing materials purity or passivation of surfaces, high efficiencies have already been achieved.  However, we show that trap states at the perovskite surface generate charge accumulation and consequent recombination losses in working solar cells.  We identify that under-coordinated iodine ions within the perovskite structure are responsible and establish a supramolecular strategy to successfully passivate these sites.  Following this strategy we demonstrate solution-processed perovskite solar cells with maximum power conversion efficiency improved from 13 to 15.7% and stable power output of 15% under constant 0.76 V forward bias in simulated full sun light.  Beyond advancing the current technology, our work demonstrates that chemical treatments of the perovskite crystal surface can lead to enhanced operation in the solar cells.



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