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Issue 4, 2017
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Copper light-catching electrodes for organic photovoltaics

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Optically thin copper films with a random array of sub-optical wavelength apertures couple strongly with light in the wavelength range 600–800 nm due to excitation of surface plasmonic resonances. Herein we show that this trapped light can be used to excite electronic transitions in a nearby strongly absorbing organic semiconductor before the plasmonic excitations dissipate their energy as heat into the metal. This energy transfer process is demonstrated using model small molecule and polymer photovoltaic devices (based on chloro-aluminium phthalocyanine:C60 and PCE-10:PC70BM heterojunctions respectively) in conjunction with a nano-hole copper electrode formed by thermal annealing an optically thin Cu film supported on polyethylene terephthalate. The efficiency of this process is shown to be highest for wavelengths in the range 650–750 nm, which is part of the solar spectrum that is weakly absorbed by today's high performance organic photovoltaic devices, and so these findings demonstrate that this type of electrode could prove useful as a low cost light catching element in high performance organic photovoltaics.

Graphical abstract: Copper light-catching electrodes for organic photovoltaics

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The article was received on 06 Feb 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017

Article type: Paper
DOI: 10.1039/C7SE00077D
Citation: Sustainable Energy Fuels, 2017,1, 859-865
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    Copper light-catching electrodes for organic photovoltaics

    H. J. Pereira, O. S. Hutter, G. D. M. R. Dabera, L. A. Rochford and Ross. A. Hatton, Sustainable Energy Fuels, 2017, 1, 859
    DOI: 10.1039/C7SE00077D

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