Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Focus: Fundamental Physics of Perovskites I - organized by Lukas Schmidt-Mende and Vladimir Dyakonov
CPP 48.4: Talk
Wednesday, March 14, 2018, 16:00–16:15, C 130
The influence of solvent engineering on the fundamental functionality of organolead triiodide perovskite solar cells — •Julian Höcker2, Philipp Rieder1, David Kiermasch1, Andreas Baumann2, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
The organic and hydrophobic polymer poly[N, N'-bis(4-butilphenyl)-N, N'-bis(phenyl)-benzidine] (pTPD) is a representative hole transport layer (HTL) for its use in hybrid perovskite solar cells. Due to its beneficial energy levels, whereby its highest occupied molecular orbital (HOMO) level matches with the valence band level of methylammonium lead iodide perovskite, an efficient hole extraction can be achieved. In this study, we demonstrate highly efficient planar p-i-n perovskite solar cells using pTPD as HTL and CH3NH3PbI3 processed from 2-step interdiffusion as the active layer. We found that the wettability of DMF strongly depends on the preparation method of pTPD. With varying the solvent and material concentrations we increased the wettability of the perovskite layer which lead to an increase in power conversion efficiency (PCE) of the corresponding solar cell devices. Our solvent engineering approach demonstrates that in this case no further interface modifications is needed for the preparation of efficient perovskite solar cell devices.