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Graphene as transparent front contact for dye sensitized solar cells
SENSOR Lab, Department of Information Engineering, University of Brescia, Via Valotti 9, 25133 Brescia, Italy; CNR-INO SENSOR Lab, Via Branze 45, 25123 Brescia, Italy.
SENSOR Lab, Department of Information Engineering, University of Brescia, Via Valotti 9, 25133 Brescia, Italy; CNR-INO SENSOR Lab, Via Branze 45, 25123 Brescia, Italy.
CNR IMM-Bologna, Via Gobetti 101, 40129 Bologna, Italy.
CNR IMM-Bologna, Via Gobetti 101, 40129 Bologna, Italy.
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2015 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 135, p. 99-105Article in journal (Refereed) Published
Abstract [en]

A transparent conductive graphene film is investigated as front contact in dye-sensitized solar cells (DSSCs), as an alternative to traditional transparent conducting oxides (TCO). The film is composed of poly-crystalline few-layers graphene, covering homogeneously an area of 1 cm2, deposited by chemical vapour deposition (CVD) technique on larger area Cu catalyst substrate and transferred on glass. DSSC photoanode is then fabricated, according to consolidated procedure, by sequential casting of TiO2 films through tape casting technique, followed by annealing at 500 °C, and sensitization with N719 dye. An outstanding value of photoconversion efficiency as high as 2% is recorded for the best cell, under one sun irradiation (AM 1.5 G, 100 mW cm−2), which is the highest ever reported for this kind of devices using graphene as front conducting film. Compared to previous results in the literature, the application of a large area continuous graphene film, guaranteed by the CVD deposition, definitely outperforms graphene layers composed by smaller graphene platelets (at micrometer scale). Morphological and electrical characterizations of graphene are reported and the functional performances of the best cell are compared with those obtained from classical DSSC exploiting fluorine-doped tin oxide. Obtained results encourage further investigation of graphene homogeneous thin film as viable alternative to standard TCOs for application in advanced devices, requiring high temperature processing or flexible substrates, incompatible with standard TCO films.

Place, publisher, year, edition, pages
2015. Vol. 135, p. 99-105
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Other Physics Topics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-35843DOI: 10.1016/j.solmat.2014.10.016ISI: 000351976000015Scopus ID: 2-s2.0-84924692305Local ID: a874b291-a39f-4d4a-a941-27bb57773fe2OAI: oai:DiVA.org:ltu-35843DiVA, id: diva2:1009097
Conference
EMRS 2014 Spring Meeting : Advanced materials and characterization techniques for solar cells II 26/05/2014 - 30/05/2014
Note

Validerad; 2015; Nivå 1; 20141110 (andbra); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2024-03-28Bibliographically approved

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Vomiero, AlbertoConcina, Isabella

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