Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.28: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

Recombination in organic donor-acceptor bulk heterojunction solar cells — •Jȩdrzej Szmytkowski — Department of Chemistry, University of Florida, Gainesville, USA — Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland

Recombination of generated charge carriers is a dominant mechanism which causes loss of photocurrent and limits the achievement of high efficiencies in organic solar cells. In this work, we present new theoretical model of bimolecular recombination in organic bulk heterojunction photovoltaic devices. Based on analysis of excitons annihilation on polarons near interface between donor and acceptor materials, we have derived analytical formula to describe the reduced Langevin recombination, which is typically observed in such molecular systems. The model explains the dependence of recombination coefficient with charge carrier concentration and also the origin of higher orders of nongeminate recombination. In addition, we discuss the light intensity dependence of polaron concentration.