Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: P2: Organic Electronics and Photovoltaics

CPP 30.14: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster B

Characterization of PTB7-Th:PC71BM bulk heterojunction solar cells — •Edoardo Barabino, Weijia Wang, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Organic photovoltaic devices are approaching the efficiency of traditional silicon based solar cells and are promising low-cost and ease production via roll-to-roll printing. In the bulk heterojunction morphology a low-band gap conjugated polymer (electron donor) and a fullerene derivative (acceptor) are blended together. The low-band gap polymer brings to the production of more excitons due to absorbing more photons (higher short circuit current) and to higher open circuit voltage. Recently a novel PTB7 derivative, denoted as PTB7-Th, has shown efficiency values close to 10%. We investigate organic solar cells made by this polymer PTB7-Th and PC71BM current-voltage characterization. In addition external quantum efficiency (EQE), UV-Vis absorption and photoluminescence spectroscopy are applied to further characterize there solar cells. Additionally the active layer surface structure is inspected via atomic force microscope (AFM).