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Issue 19, 2014
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Energy level alignment of polythiophene/ZnO hybrid solar cells

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Abstract

Energy level alignment at interfaces is critical for fundamental understanding and optimization of organic photovoltaics (OPV) as band offsets of the donor and acceptor materials largely determine the open circuit voltage (Voc) of the device. Using ultraviolet photoemission spectroscopy (UPS) and inverse photoemission spectroscopy (IPS), we examined the correlation between energy level alignment and photovoltaic properties of a model bilayer hybrid solar cell incorporating electrodeposited polythiophene (e-PT) films on ZnO planar substrates. The electrolyte anion (BF4, PF6, ClO4 or CF3SO3) in the electrodeposition solution was found to have a strong influence on the e-PT film morphology and adhesion, the energy level alignment at the interface, and ultimately the Voc of the photovoltaic devices.

Graphical abstract: Energy level alignment of polythiophene/ZnO hybrid solar cells

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Publication details

The article was received on 24 Feb 2014, accepted on 17 Mar 2014 and first published on 18 Mar 2014


Article type: Paper
DOI: 10.1039/C4TA00937A
Citation: J. Mater. Chem. A, 2014,2, 7034-7044
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    Energy level alignment of polythiophene/ZnO hybrid solar cells

    W. Feng, S. Rangan, Y. Cao, E. Galoppini, R. A. Bartynski and E. Garfunkel, J. Mater. Chem. A, 2014, 2, 7034
    DOI: 10.1039/C4TA00937A

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