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

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 diffe...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2018-02, Vol.23 (2), p.449
Main Authors: Lim, Chang Jin, Park, Min Gyu, Kim, Min Su, Han, Jeong Hwa, Cho, Soohaeng, Cho, Mann-Ho, Yi, Yeonjin, Lee, Hyunbok, Cho, Sang Wan
Format: Article
Language:English
Subjects:
Buckminsterfullerene
Electronic structure
Electrons
Energy
energy band diagram
Energy levels
Fullerenes
Heterojunctions
Indium
Interfaces
Magnetism
Molecular orbitals
organic photovoltaics
Photoelectric emission
Photoelectron spectroscopy
photoemission spectroscopy
Photovoltaics
Spectroscopy
Spectrum analysis
Substrates
Thin films
Tin oxides
V2O5
Vanadium
Zinc
ZnPc
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Summary: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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules23020449