Molecular ordering effect of regioregular poly(3-hexylthiophene) using sulfur K-edge X-ray absorption spectroscopy

Ikeura, Hiromi*; Sekiguchi, Tetsuhiro

The electronic structure of the unoccupied conduction band of regioregular poly(3-hexylthiophene) (RR-P3HT) was investigated by X-ray absorption spectroscopy (XAS) near the sulfur K-edge. Angle-dependent XAS studies revealed that polymer chains in films are well aligned and oriented edge-on with respect to the Si substrate. It was clearly observed that the bottom of the conduction band near the Fermi level in a - stacking film is lower (0.3 eV) than that in a powder. It was demonstrated that - stacking interactions improve the power conversion efficiency through the reduction of the lowest unoccupied molecular orbital (LUMO) energy level.

Language	:	English
Journal	:	Japanese Journal of Applied Physics
Volume	:	53
Number	:	2S
Pages	:	p.02BB07_1 - 02BB07_4
Publication Year/Month	:	2014/02
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Paper URL	:	https://doi.org/10.7567/JJAP.53.02BB07
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Keywords	:	no keyword
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Article of JAEA R&D Review	:
Cooperating Institute	:	産業技術総合研究所

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Registration No. : AA20140019
JAEA Abstracts No. : 44000702
Paper Submission No. : 17317

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