Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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