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Recent developments in sensitized mesoporous heterojunction solar cells

Published online by Cambridge University Press:  15 March 2011

Jessica Krüger,
Udo Bach,
Robert Plass,
Marco Piccerelli,
Le Cevey and
Michael Grätzel
Jessica Krüger
Affiliation:
Laboratoire de photonique et interfaces, Institute de chimie physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Udo Bach
Affiliation:
Ntera Ltd, Grange Road, Rathfarnham, Dublin 16, Ireland
Robert Plass
Affiliation:
Laboratoire de photonique et interfaces, Institute de chimie physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Marco Piccerelli
Affiliation:
Laboratoire de photonique et interfaces, Institute de chimie physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Le Cevey
Affiliation:
Laboratoire de photonique et interfaces, Institute de chimie physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Michael Grätzel
Affiliation:
Laboratoire de photonique et interfaces, Institute de chimie physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
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Abstract

The performance of solid-state dye-sensitized solar cells based on spiro-MeOTAD (2,2'7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene) was considerably improved by decreasing charge recombination across the interface of the heterojunction. This was achieved by blending the hole conductor matrix with a combination of 4-tert-butylpyridine (tBP) and Li[CF3SO2]2N. Open circuit voltages (Uoc) over 900mV and short circuit currents (Isc) up to 5.1 mA were obtained, yielding an overall efficiency of 2.56 % at AM1.5 illumination. Further improvement of the device performance was observed when conducting stripes of silver were deposited onto the devices as charge collector. The beneficial effect however could be assigned to the contamination of the dye-sensitized TiO2 film with silver during the dyeing process.

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References

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