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Optimization of a high work function solution processed vanadium oxide hole-extracting layer for small molecule and polymer organic photovoltaic cells
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Hancox, Ian, Rochford, Luke A., Clare, D. (Dave), Walker, Marc, Mudd, James J., Sullivan, Paul J., Schumann, Stefan, McConville, C. F. and Jones, T. S. (Tim S.) (2013) Optimization of a high work function solution processed vanadium oxide hole-extracting layer for small molecule and polymer organic photovoltaic cells. The Journal of Physical Chemistry C, Volume 117 (Number 1). pp. 49-57. doi:10.1021/jp3075767 ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp3075767
Abstract
We report a method of fabricating a high work function, solution processable vanadium oxide (V2Ox(sol)) hole-extracting layer. The atmospheric processing conditions of film preparation have a critical influence on the electronic structure and stoichiometry of the V2Ox(sol), with a direct impact on organic photovoltaic (OPV) cell performance. Combined Kelvin probe (KP) and ultraviolet photoemission spectroscopy (UPS) measurements reveal a high work function, n-type character for the thin films, analogous to previously reported thermally evaporated transition metal oxides. Additional states within the band gap of V2Ox(sol) are observed in the UPS spectra and are demonstrated using X-ray photoelectron spectroscopy (XPS) to be due to the substoichiometric nature of V2Ox(sol). The optimized V2Ox(sol) layer performance is compared directly to bare indium–tin oxide (ITO), poly(ethyleneoxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and thermally evaporated molybdenum oxide (MoOx) interfaces in both small molecule/fullerene and polymer/fullerene structures. OPV cells incorporating V2Ox(sol) are reported to achieve favorable initial cell performance and cell stability attributes.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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Library of Congress Subject Headings (LCSH): | Photovoltaic cells, Organic semiconductors, Vanadium oxide, Interfaces (Physical sciences) | ||||
Journal or Publication Title: | The Journal of Physical Chemistry C | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 1932-7447 | ||||
Official Date: | 10 January 2013 | ||||
Dates: |
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Volume: | Volume 117 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 49-57 | ||||
DOI: | 10.1021/jp3075767 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 24 December 2015 | ||||
Date of first compliant Open Access: | 24 December 2015 | ||||
Funder: | Asylum Research UK, Engineering and Physical Sciences Research Council (EPSRC) |
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