Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 25: Organic Electronics and Photovoltaics I
(Joint session of CPP, DS, HL and O, organized by CPP)

DS 25.3: Talk

Tuesday, March 8, 2016, 14:30–14:45, H37

Strong influence of morphology on charge transport and recombination in solution processed small molecule based solar cells — •Alexey Gavrik¹, Andreas Baumann², Yuriy Luponosov³, Sergey Ponomarenko^3,4, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), 97074 Würzburg — ³Enikolopov Inst Synthet Polymer Mat, 117393 Moscow, Russia — ⁴Lomonosov Moscow State University, 119991 Moscow, Russia

Solution processed small molecules (SSM) are promising materials for solar cell (SC) applications due to their well defined structure and high chemical reproducibility. Donor-acceptor-donor layout of SSM provides enhanced exciton splitting, as well as good possibility for effective charge transfer. The blend morphology in a bulk-heterojunction (BHJ) SC is assumed to play a crucial role in the cell performance. Therefore, we set to find optimal BHJ fabrication method keeping track of corresponding transport properties. In this work we studied DTS(EtHex)₂-(2T-DCV-Me)₂:PC₆₀BM BHJ SC using the photogenerated charge carrier extraction technique OTRACE in order to analyze non-geminate recombination and determine charge carrier mobility in context of varying blend morphology. We show that different preparation conditions have a strong impact on the blend morphology and thus on the charge carrier transport (i.e. mobility and recombination rate). Furthermore, introduced modifications allowed to achieve a 4-fold enhancement of SC efficiency up to 4.3%.