Consequence of thermal annealing on PCDTBT-based solar cells performance and composition profile (presentation video)

Olesia Synooka; Kai R. Eberhardt; Chetan Raj Singh; Gernot Ecke; Bernhard Ecker; Elizabeth von Hauff; Gerhard Gobsch; Harald Hoppe

doi:10.1117/12.2063931

17 August 2014 Consequence of thermal annealing on PCDTBT-based solar cells performance and composition profile (presentation video)

Olesia Synooka, Kai R. Eberhardt, Chetan Raj Singh, Gernot Ecke, Bernhard Ecker, Elizabeth von Hauff, Gerhard Gobsch, Harald Hoppe

Author Affiliations +

Proceedings Volume 9165, Physical Chemistry of Interfaces and Nanomaterials XIII; 916507 (2014) https://doi.org/10.1117/12.2063931
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

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.

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Olesia Synooka, Kai R. Eberhardt, Chetan Raj Singh, Gernot Ecke, Bernhard Ecker, Elizabeth von Hauff, Gerhard Gobsch, and Harald Hoppe "Consequence of thermal annealing on PCDTBT-based solar cells performance and composition profile (presentation video)", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 916507 (17 August 2014); https://doi.org/10.1117/12.2063931

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KEYWORDS

Annealing

Solar cells

Video

Dielectric spectroscopy

Electron transport

Ellipsometry

Photovoltaics

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