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HL: Fachverband Halbleiterphysik

HL 18: Perovskite and Hybrid Photovolatics

HL 18.4: Vortrag

Dienstag, 13. März 2018, 10:15–10:30, EW 203

Scalable, uniform coevaporated formamidinium lead triiodide thin-films for photovoltaics — •Juliane Borchert, Rebecca L. Milot, Jay B. Patel, Christopher L. Davies, Adam D. Wright, Laura Martínez Maestro, Henry J. Snaith, Laura M. Herz, and Michael B. Johnston — Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OX1 3PU, United Kingdom

A rapid rise in solar cell efficiencies and bandgap tunablity over much of the visible spectrum have made perovskite materials the focus of intense research. Initially, MAPbI₃ was the most commonly investigated material, however recently, a variety of other materials have been developed by substituting the organic cation in the perovskite structure. In particular, perovskites containing formamidinium (FA) and cesium as well as mixed cations have shown promise. With mixed cation perovskites high efficiencies and also stability improvements have been achieved [1]. Coevaporation is an advantageous deposition technique for perovskite thin-films allowing for the deposition of smooth, pinhole free, uniform films over a large area [2]. Currently, only a small number of perovskite materials have been realized using this technique. We present a study showing that coevaporation can be used to deposit FAPbI₃. We fabricated solar cells with efficiencies of up to 15% . The material exhibited high charge carrier mobilities and excellent optical properties [3]. This is an important step towards the fabrication of evaporated, stable, mixed cation perovskite thin-films.

[1] S.N. Habisreutinger et al., APL Mater. 2016, 4 [2] M. Liu et al., Nature 2013, 501 [3] J. Borchert et al., ACS Energy Lett 2017, 2