Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Methylammonium lead halide perovskites have become one of the most promising photovoltaic materials, with power conversion efficiencies now beyond 20%. Most of these certified solar cells are processed from solution, and the perovskite layer is deposited from toxic solvents such as dimethylformamide (DMF) or dimethyl sulfoxide(DMSO) on (mesoscopic) metal oxides. Vacuum techniques are solvent-free with unique intrinsic characteristics such as a precise control over the film thickness and composition, low-temperature processing, and the possibility of preparing multilayer structures. These advantages make vacuum techniques a viable alternative to solution-based processing for perovskite solar cell preparation. Here, we present the preparation and optimization of fully vacuum deposited perovskite solar cells employing doped organic charge transport layers. In this work we perform a direct comparison between two common configurations, one inverted with respect to the other (p-i-n and n-i-p), where the intrinsic layer (i) is a methylammonium lead iodide film. This configuration leads to planar solar cells without hysteresis and high efficiencies, 15% for p-i-n and 18% for n-i-p on average.
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