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Molecules. 2018 Feb 18;23(2). pii: E449. doi: 10.3390/molecules23020449.

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

Author information

1
Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Korea. eyepiece89@yonsei.ac.kr.
2
Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Korea. ham744@naver.com.
3
Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Korea. kimssu98k@yonsei.ac.kr.
4
Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Korea. jh-han@yonsei.ac.kr.
5
Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Korea. shcho@yonsei.ac.kr.
6
Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Korea. mh.cho@yonsei.ac.kr.
7
Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Korea. yeonjin@yonsei.ac.kr.
8
Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gaongwon-do 24341, Korea. hyunbok@kangwon.ac.kr.
9
Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 26493, Korea. dio8027@yonsei.ac.kr.

Abstract

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.

KEYWORDS:

V2O5; ZnPc; energy band diagram; organic photovoltaics; photoemission spectroscopy

PMID:
29463008
PMCID:
PMC6017094
DOI:
10.3390/molecules23020449
[Indexed for MEDLINE]
Free PMC Article

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