Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 21: Fundamentals of Perovskite Photovoltaics II (joint session CPP/DS/HL)
HL 21.4: Vortrag
Montag, 20. März 2017, 16:15–16:30, ZEU 222
Time Resolved Microwave Conductivity on Perovskites — •Marvin Grüne1, Andreas Sperlich1, Andreas Baumann2, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
Organo-metal halide perovskites continue to be the star of thin film solar cells exhibiting rapidly rising power conversion efficiencies. For further improvement of these solar cells it is essential to understand the fundamental intrinsic properties like photoconductivity, recombination and charge carrier mobility. Therefore, we investigate the mixed halide perovskite layers of CH3NH3PbX3 (X: I−, Br− and Cl−) using time-resolved microwave conductivity. With this contactless measurement technique we address the charge carrier lifetime, decay kinetics and intrinsic mobility of perovskite structures with different halide substituents X. The mobility increases more than a factor of 2 in this order of substituents up to 8 cm2/Vs. Furthermore, the influence of solvent annealing on the crystallization process of the CH3NH3PbI3 film has been investigated, now considering temperature dependence. This crystallization method generates e.g. bigger crystal domain sizes and almost one order of magnitude higher mobilities. Due to the absence of transport layers, we can relate differences in the results to intrinsic properties of the perovskite layers. Solar cells with the investigated layer achieve up to 16% efficiency in our labs.