Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.28: Poster

Monday, March 14, 2011, 17:30–19:30, P2

Diindenoperylene derivatives as green donors for organic solar cells — •Felix Holzmueller, Joerg Alex, Jan Meiss, Christoph Schuenemann, Wolfgang Tress, Markus Hummert, Karl Leo, and Moritz Riede — Institut für Angewandte Photophysik, Technische Universität Dresden, 01069 Dresden, Germany

Clean energy production is one of the most challenging problems of this century. Organic solar cells (OSC) may contribute to a sustainable solution, providing a cost-efficient way to convert sunlight into electrical power. For high OSC performance, a full coverage of a broad part of the solar spectrum is necessary, which will require materials with blue, green, and red absorption.

Here, we present a series of diindenoperylene derivatives (DIPD) as green donors for OSC. We study the structure-property relationship by investigating their molecular properties and morphology of thin films, and then incorporating such materials into OSC.

Both type and size of DIPD sidegroups are found to significantly influence molecular stacking and absorption properties. We relate these results to OSC with C60 as acceptor with high open circuit voltages of around 1V and fill factors of up to 75%. The device efficiency is limited by the exciton diffusion length, which can be approximated from systematic thickness variations in flat heterojunction (FHJ) OSC. Bulk heterojunction and FHJ devices yield power conversion efficiencies of over 2% and are promising for application in tandem OSC with additional materials covering the red spectrum.