Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Focus Session: Structural Ordering and Electronic Transport I (jointly with CPP)
HL 2.11: Talk
Monday, March 26, 2012, 13:00–13:15, ER 270
Morphology controlled charge transport in diblock copolymer based solar cells — •Chetan Raj Singh1, Ruth Lohwasser2, Olesia Synooka1, Mukundan Thelakkat2, Gerhard Gobsch1, and Harald Hoppe1 — 1Institute of Physics, TU Ilmenau, Germany — 2Applied Functional Polymers, University of Bayreuth, Germany
The block copolymers as an active material have been sought after in solar cells to realize scalable and morphologically stable polymer solar cells. We report here the charge carrier mobilities of holes and electrons in the studied diblock copolymer (P3HT-b-PPerAcr) and in its constituting homopolymers, P3HT and PPerAcr. We discuss the effects of charge carrier mobility imbalance and its consequence on solar cell properties. In the study, the morphology of the diblock copolymer is altered by blending donor component and subsequent thermal treatments which have given rise to up to two orders of magnitude increase in charge carrier mobilities. Furthermore, the influence of morphology and achieved charge carrier mobility balance are studied on solar cell devices.