Publication date: 1st July 2014
Organometal halide perovskite-based solar cells have recently realized large conversion efficiency over 17% showing great promise for a new large scale cost-competitive photovoltaic technology. The proficient operation of the CPbX3 perovskite solar cell, where C is an organic cation, has been accomplished by many different approaches, and it points to a robust photovoltaic operation mechanism that so far has not yet been fully understood. We report the behaviour of lead halogenate perovskite solar cell probed by a number of dynamic techniques including impedance spectroscopy and time transient dynamics. We compare a number of compositions and morphologies and we show the general characteristics of the observed processes. The perovskite solar cell shows recombination resistance and chemical capacitance, but new and interesting phenomena govern the solar cell behaviour in the long time scale, that influence the solar cell performance in phenomena as hysteresis or time dependent luminescence. These results indicate the need for detailed studies to relate structural, ionic and electronic behaviours in the perovskite solar cells.
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