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Issue 5, 2011
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Increased efficiency in small molecule organic photovoltaic cells through electrode modification with self-assembled monolayers

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Abstract

We report that through the incorporation of polar self-assembled monolayers (SAMs) at the indium tin oxide (ITO)/donor interface in chloroaluminium phthalocyanine (ClAlPc)/C60 discrete heterojunction organic photovoltaic (OPV) cells, the power conversion efficiency can be dramatically increased. This enhanced performance is due to better alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital (HOMO) of the ClAlPc donor, as well as an improved surface compatibility which provides a more optimised electrode/donor interface. Optimised cells demonstrate an increase of ∼85% in open circuit voltage which results in a near three-fold increase in power conversion efficiency from 1.3% to 3.3% under 1 sun illumination. Comparative studies are made using cells based on two other organic donor materials, copper phthalocyanine (CuPc) and boron subphthalocyanine (SubPc).

Graphical abstract: Increased efficiency in small molecule organic photovoltaic cells through electrode modification with self-assembled monolayers

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Publication details

The article was received on 04 Jan 2011, accepted on 17 Mar 2011 and first published on 08 Apr 2011


Article type: Communication
DOI: 10.1039/C1EE00005E
Citation: Energy Environ. Sci., 2011,4, 1708-1711

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    Increased efficiency in small molecule organic photovoltaic cells through electrode modification with self-assembled monolayers

    N. Beaumont, I. Hancox, P. Sullivan, R. A. Hatton and T. S. Jones, Energy Environ. Sci., 2011, 4, 1708
    DOI: 10.1039/C1EE00005E

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