Journal
ORGANIC ELECTRONICS
Volume 11, Issue 11, Pages 1853-1857Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2010.08.011
Keywords
Donor/acceptor blend; Unoccupied states; Inverse photoemission spectroscopy; Electronic structure; Organic photovoltaics
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [19105005]
- Deutsche Forschungsgemeinschaft (DFG) [1355]
- Japan Society for the Promotion of Science (JSPS)
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Blends of copper phthalocyanine (CuPc) and fullerene (C(60)) have successfully been used for organic field-effect transistors and photovoltaic cells. In this work we investigate the unoccupied states of CuPc/C(60) blends by inverse photoemission spectroscopy. The energies of the lowest unoccupied molecular orbitals of CuPc and C(60) vary linearly with the mixing ratio, which is consistent with the energy shifts of the vacuum level, the highest occupied molecular orbitals and core levels. The observed results can be interpreted as unchanged electron affinities of CuPc and C(60) in the blended films due to nano-phase separation. (C) 2010 Elsevier B.V. All rights reserved.
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