Type-II colloidal quantum dot sensitized solar cells with a thiourea based organic redox couple.
2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 13, 6032-6037 p.Article in journal (Refereed) Published
In this paper, one kind of org. electrolyte based on tetramethylthiourea is employed for quantum dot sensitized solar cells (QDSCs). By reducing the impedance between the electrolyte and the counter electrode, the fill factor of such org. electrolyte based QDSCs is significantly improved. It is possible to substantially increase the photovoltage and to reach an efficiency three times higher than that of a commonly used inorg. electrolyte. The light harvesting ability of the org. electrolyte based QDSCs is successfully extended by using type-II QDs, where the adsorption of ZnS gives an addnl. advantage in further enhancing the stability of the cells. It is obsd. that core/shell ZnSe/CdS type-II QDs give higher electron injection than CdS/ZnSe QDs, proving that the electron distribution in the QDs is important for the electron extn. A full working mechanism of the org. redox couple for the QDSCs is proposed. [on SciFinder(R)]
Place, publisher, year, edition, pages
2012. Vol. 22, no 13, 6032-6037 p.
colloidal quantum dot sensitized solar cell tetramethylthiourea redox couple
IdentifiersURN: urn:nbn:se:uu:diva-218472DOI: 10.1039/c2jm15857dOAI: oai:DiVA.org:uu-218472DiVA: diva2:695817
CAPLUS AN 2012:336265(Journal; Online Computer File)2014-02-122014-02-122014-02-12