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

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 res...

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Published inJapanese Journal of Applied Physics Vol. 53; no. 2S; pp. 2 - 1-02BB07-4
Main Authors Ikeura-Sekiguchi, Hiromi, Sekiguchi, Tetsuhiro
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.02.2014
Subjects
Absorption spectroscopy
Conduction band
Energy conversion efficiency
Energy levels
Molecular orbitals
Silicon substrates
Stacking
Sulfur
X-rays
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Summary: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 π-π stacking film is lower (0.3 eV) than that in a powder. It was demonstrated that π-π stacking interactions improve the power conversion efficiency through the reduction of the lowest unoccupied molecular orbital (LUMO) energy level.
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.02BB07