Photoelectron spectroscopic study of band alignment of polymer/ZnO photovoltaic device structure

Using x-ray photoelectron spectroscopy, we investigated the band alignment of a Ag/poly(3-hexylthiophene-2,5-diyl) (P3HT)/ZnO photovoltaic structure. At the P3HT/ZnO interface, a band bending of P3HT and a short surface depletion layer of ZnO were observed. The offset between the highest occupied mo...

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Bibliographic Details
Published in:Applied physics letters 2013-01, Vol.102 (4)
Main Authors: Nagata, T., Oh, S., Yamashita, Y., Yoshikawa, H., Ikeno, N., Kobayashi, K., Chikyow, T., Wakayama, Y.
Format: Article
Language:English
Subjects:
Alignment
APPROXIMATIONS
Band spectra
Banded structure
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEPLETION LAYER
Devices
EV RANGE
INTERFACES
MOLECULAR ORBITAL METHOD
ORGANIC COMPOUNDS
Photovoltaic cells
PHOTOVOLTAIC EFFECT
POLYMERS
SEMICONDUCTOR MATERIALS
SILVER
Solar cells
SURFACES
ULTRAVIOLET RADIATION
Volatile organic compounds
X-RAY PHOTOELECTRON SPECTROSCOPY
Zinc oxide
ZINC OXIDES
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Summary:Using x-ray photoelectron spectroscopy, we investigated the band alignment of a Ag/poly(3-hexylthiophene-2,5-diyl) (P3HT)/ZnO photovoltaic structure. At the P3HT/ZnO interface, a band bending of P3HT and a short surface depletion layer of ZnO were observed. The offset between the highest occupied molecular orbital of P3HT and the conduction band minimum of ZnO at the interface contributed to the open circuit voltage (Voc) was estimated to be approximately 1.5 ± 0.1 eV, which was bigger than that of the electrically measured effective Voc of P3HT/ZnO photovoltaic devices, meaning that the P3HT/ZnO photovoltaic structure has the potential to provide improved photovoltaic properties.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4790298