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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 142<br />

C33 - Transparent, air-stable copper electrodes for electron-extraction in organic<br />

photovoltaics<br />

Oliver Hutter, Ross Hatton<br />

Univeristy of Warwick, University of Warwick, Coventry, 0, GB<br />

Optically thin metal films are receiving growing attention as an economically viable<br />

alternative to conducting oxide electrodes. Whilst copper is particularly attractive for this<br />

application, owing to its high electrical conductivity and relatively low cost, its susceptibility to<br />

oxidation is a serious drawback.<br />

Figure 1<br />

We report the fabrication and properties of optically thin nano-structured copper<br />

electrodes that are resistant to oxidation in air and ozone treatment. These chemically welldefined<br />

window electrodes are employed as the electron-extracting electrode in efficient bulk<br />

heterojunction organic photovoltaics, removing the requirement for a low work function metal<br />

electrode. The science that underpins the operation of these electrodes is discussed with<br />

reference to measurements of the interfacial energetics.<br />

© SEFIN 2012

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