Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
High crystal orientation in perovskite absorber layers is beneficial for photovoltaic device performance. Recently, we have shown perfectly oriented MAPbBr3 perovskite crystallites incorporated in solar cells which resulted in internal quantum efficiencies approaching unity.[1] Here, we have developed a simple and fast route for MAPbI3 in order to tune the crystal orientation and crystal size independently. With this route, we show that the orientation of the long c-axis is switchable for the tetragonal MAPbI3 crystallites, where we can align it parallel to the substrate as well as the usual orientation with the c-axis perpendicular to the substrate. Our approach is based on different interactions of solvents and the Pb(Ac)2 precursor during perovskite crystal growth. We specified the influence of these parameters, grain size and crystal orientation in photovoltaic devices and investigated their optoelectronic characteristics with Time of Flight (ToF). Films with large and perfectly oriented grains show very high charge carrier mobility exceeding 8 cm2/Vs, approximately an order of magnitude higher than standard disordered samples. When applied in planar heterojunction solar cells, the short-circuit currents exceed 22 mA/cm2 with open-circuit voltages about 1.1 V. This results promote a further understanding of perovskite thin film crystallization behaviour and its resulting different film properties.
[1] N. Giesbrecht, J. Schlipf, L. Oesinghaus, A. Binek, T. Bein, et al. ACS Energy Lett., 2016, 1, 150-154
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