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Open AccessArticle

Electronic Structure of C60/Zinc Phthalocyanine/V2O5 Interfaces Studied Using Photoemission Spectroscopy for Organic Photovoltaic Applications

1
Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Korea
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Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Korea
3
Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gaongwon-do 24341, Korea
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(2), 449; https://doi.org/10.3390/molecules23020449
Received: 13 January 2018 / Revised: 11 February 2018 / Accepted: 14 February 2018 / Published: 18 February 2018
(This article belongs to the Special Issue Advanced Functional Dyes)
The interfacial electronic structures of a bilayer of fullerene (C60) and zinc phthalocyanine (ZnPc) grown on vanadium pentoxide (V2O5) thin films deposited using radio frequency sputtering under various conditions were studied using X-ray and ultraviolet photoelectron spectroscopy. The energy difference between the highest occupied molecular orbital (HOMO) level of the ZnPc layer and the lowest unoccupied molecular orbital (LUMO) level of the C60 layer was determined and compared with that grown on an indium tin oxide (ITO) substrate. The energy difference of a heterojunction on all V2O5 was found to be 1.3~1.4 eV, while that on ITO was 1.1 eV. This difference could be due to the higher binding energy of the HOMO of ZnPc on V2O5 than that on ITO regardless of work functions of the substrates. We also determined the complete energy level diagrams of C60/ZnPc on V2O5 and ITO. View Full-Text
Keywords: organic photovoltaics; photoemission spectroscopy; energy band diagram; ZnPc; V2O5 organic photovoltaics; photoemission spectroscopy; energy band diagram; ZnPc; V2O5
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MDPI and ACS Style

Lim, C.J.; Park, M.G.; Kim, M.S.; Han, J.H.; Cho, S.; Cho, M.-H.; Yi, Y.; Lee, H.; Cho, S.W. Electronic Structure of C60/Zinc Phthalocyanine/V2O5 Interfaces Studied Using Photoemission Spectroscopy for Organic Photovoltaic Applications. Molecules 2018, 23, 449.

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