Vacuum-Deposited Planar Heterojunction Polymer Solar Cells

The vacuum thermal evaporation of poly(3-hexylthiophene) (P3HT) for application in photovoltaic cells is demonstrated. Structural changes before and after evaporation are determined using GPC, UV−vis absorption spectroscopy, NMR, and FTIR. GPC showed that the polymer molecular weight is reduced duri...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2011-01, Vol.3 (1), p.11-15
Main Authors: Kovacik, Peter, Sforazzini, Giuseppe, Cook, Andrew G, Willis, Shawn M, Grant, Patrick S, Assender, Hazel E, Watt, Andrew A. R
Format: Article
Language:English
Subjects:
Organic Chemicals
Photochemistry
Solar Energy
Thiophenes - chemistry
Vacuum
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Summary:The vacuum thermal evaporation of poly(3-hexylthiophene) (P3HT) for application in photovoltaic cells is demonstrated. Structural changes before and after evaporation are determined using GPC, UV−vis absorption spectroscopy, NMR, and FTIR. GPC showed that the polymer molecular weight is reduced during evaporation, leading to a blue-shift of the absorption spectra. FTIR and NMR were used to examine the change in chemical structure: it was found that conjugation remains mostly intact; however, the conjugation length decreases and side chains dissociate from the backbone. Bilayer heterojunction solar cells were fabricated by sequential deposition of P3HT and C60 and the photovoltaic response measured.
ISSN:1944-8244
1944-8252
DOI:10.1021/am1008985