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Side-chain effects on electronic structure and molecular stacking arrangement of PCBM spin-coated films
- Authors
- Bazylewski, Paul F.; Kim, Kyung Hwan; Forrest, Jay L.; Tada, Hirokazu; Choi, Dong Hoon; Chang, Gap Soo
- Issue Date
- 18-5월-2011
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- CHEMICAL PHYSICS LETTERS, v.508, no.1-3, pp.90 - 94
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL PHYSICS LETTERS
- Volume
- 508
- Number
- 1-3
- Start Page
- 90
- End Page
- 94
- ISSN
- 0009-2614
- Abstract
- The electronic structure and molecular stacking arrangement of [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) was studied using a combination of near-edge X-ray absorption fine structure measurements and density functional theory calculations. Measurements show that the side chain lifts the energy degeneracy of the C60 molecular orbitals around the chain attachment. This breaks the orbital symmetry of the LUMO of the C60 backbone which is observed through polarization dependence of C 1s -> pi* transitions. This dependence is analyzed to determine the bulk crystal structure of PCBM. X-ray emission and absorption measurements indicate the band gap energy of PCBM to be 1.87 eV. (C) 2011 Elsevier B. V. All rights reserved.
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