Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.71: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Effects of modifying active-layer/cathode interface on P3HT/PCBM based bulk-heterojunction solar cells — •Sidhant Bom and Veit Wagner — Jacobs University Bremen, School of Engineering and Science, Campus Ring 8, 28759 Bremen, Germany

The compatibility of organic photovoltaics (OPVs) with large area printing using flexible substrates offers significant cost reduction and gives the field substantial ecological and economic advantages. However, low efficiencies and inferior environmental stability has been their major setbacks. Photo-generated excitons which dissociate at donor-acceptor interface in bulk-heterojunction OPV devices are collected at the electrodes. This work focuses on interface engineering between the active layer and cathode and on environmental stability.

A series of bulk-heterojunction OPV cells were made on indium tin oxide coated glass with poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) composite as the active layer using different work-function metals: Ag, Al, Au and Ca as cathodes. Furthermore, the environment was changed for different production steps between ambient air and dry nitrogen. For the devices completely processed in air, the cells with Al electrodes showed the best performance which was however much lower than completely nitrogen processed samples. The photocurrent features on the air processed sample were strongly bias dependent and indicates degradation of PCBM.