Confocal and near-field spectroscopic investigation of P3HT:PCBM organic blend film upon thermal annealing

Xiao Wang; Dai Zhang; Kai Braun; Hans-Joachim Egelhaaf; Alfred J. Meixner

doi:10.1117/12.826077

2 September 2009 Confocal and near-field spectroscopic investigation of P3HT:PCBM organic blend film upon thermal annealing

Xiao Wang, Dai Zhang, Kai Braun, Hans-Joachim Egelhaaf, Alfred J. Meixner

Author Affiliations +

Proceedings Volume 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V; 73950F (2009) https://doi.org/10.1117/12.826077
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

The poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) organic films are widely employed as electronic donor and acceptor in the field of organic film solar cell because of their high photovoltaic conversion efficiency. A home-built parabolic mirror assisted confocal and apertureless near-field optical microscope was used to investigate the degradation behavior of the film and to distinguish the donor and acceptor domains both topographically and optically. Under ambient condition, the degradation rates are decreased in the sequence of pristine P3HT, blend P3HT:PCBM film and pristine PCBM. N2 protection dramatically slows down the film degradation rate. Using confocal spectroscopic mapping, we are able to distinguish the local distributions of P3HT and PCBM. Micrometer PCBM aggregates were observed due to the thermal annealing process. Our experimental methods show the possibility to investigate morphology and the photochemistry properties of the organic solar cell films with high spatial resolution.

Citation Download Citation

Xiao Wang, Dai Zhang, Kai Braun, Hans-Joachim Egelhaaf, and Alfred J. Meixner "Confocal and near-field spectroscopic investigation of P3HT:PCBM organic blend film upon thermal annealing", Proc. SPIE 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V, 73950F (2 September 2009); https://doi.org/10.1117/12.826077

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