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Proceedings Paper

Consequence of thermal annealing on PCDTBT-based solar cells performance and composition profile (presentation video)
Author(s): Olesia Synooka; Kai R. Eberhardt; Chetan Raj Singh; Gernot Ecke; Bernhard Ecker; Elizabeth von Hauff; Gerhard Gobsch; Harald Hoppe
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Paper Abstract

As reported earlier, the photovoltaic performance of PCDTBT:PCBM polymer solar cells drastically decreases upon thermal annealing. It was demonstrated in the literature, that thermal annealing leads to increased trap formation and as a consequence disturb solar cell performance, especially via a reduced fill factor. This has been demonstrated by space-charge-limited-current analysis and ellipsometry, as well as, structural changes analyse of PCDTBT upon annealing. However, we decided in addition to investigate morphological changes occurring within PCDTBT:PCBM photoactive blend layers upon thermal annealing, as these must have an impact on charge transport. By application of several characterizations techniques, and especially supported by results of Impedance Spectroscopy and Auger Electron Spectroscopy (AES), indeed the existence of an unfavourable compositional gradient within the photoactive layer could be revealed. This compositional gradient may be in part accounted for harming the transport of electrons and holes in either direction.

Paper Details

Date Published: 17 August 2014
PDF: 1 pages
Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 916507 (17 August 2014); doi: 10.1117/12.2063931
Show Author Affiliations
Olesia Synooka, Technische Univ. Ilmenau (Germany)
Kai R. Eberhardt, Technische Univ. Ilmenau (Germany)
Chetan Raj Singh, Technische Univ Ilmenau (Germany)
Gernot Ecke, Technische Univ. Ilmenau (Germany)
Bernhard Ecker, University of Freiburg (Germany)
Elizabeth von Hauff, Albert-Ludwigs-Univ. Freiburg (Germany)
Gerhard Gobsch, Technische Univ. Ilmenau (Germany)
Harald Hoppe, Technische Univ. Ilmenau (Germany)

Published in SPIE Proceedings Vol. 9165:
Physical Chemistry of Interfaces and Nanomaterials XIII
Natalie Banerji; Sophia C. Hayes; Carlos Silva, Editor(s)

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