Energy level alignment in polymer organic solar cells at donor-acceptor planar junction formed by electrospray vacuum deposition

Journal Article · Mon Apr 21 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4873164· OSTI ID:22263666

Kim, Ji-Hoon; Hong, Jong-Am; Kwon, Dae-Gyeon; Seo, Jaewon; Park, Yongsup ^[1]

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1. Department of Physics and Research Institute for Basic Sciences, Kyung Hee University, Seoul 130-701 (Korea, Republic of)

Using ultraviolet photoelectron spectroscopy (UPS), we have measured the energy level offset at the planar interface between poly(3-hexylthiophene) (P3HT) and C{sub 61}-butyric acid methylester (PCBM). Gradual deposition of PCBM onto spin-coated P3HT in high vacuum was made possible by using electrospray vacuum deposition (EVD). The UPS measurement of EVD-prepared planar interface resulted in the energy level offset of 0.91 eV between P3HT HOMO and PCBM LUMO, which is considered as the upper limit of V{sub oc} of the organic photovoltaic cells.

• OSTI ID: 22263666
• Journal Information: Applied Physics Letters, Vol. 104, Issue 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
36 MATERIALS SCIENCE
ENERGY LEVELS
ORGANIC SOLAR CELLS
PHOTOELECTRON SPECTROSCOPY
POLYMERS
VACUUM COATING