Abstract
Cadmium selenide (CdSe) quantum dots (QDs) with different particle sizes have been used as an inorganic co-sensitizer in addition to organic dye for large band gap mesoporous TiO2 dye sensitized solar cells. The QDs co-sensitized solar cells exhibited overall highest conversion efficiency of 3.65% at 1 sun irradiation for 3.3 nm particle size corresponding to a visible light absorption wavelength of 528 nm. The photovoltaic characteristics of CdSe QDs co-sensitized cells depend on the particle sizes rather than broad spectral light absorption as compared with CdSe QDs alone sensitized and standard dye-sensitized solar cells. Correlation between CdSe QDs adsorption on mesoporous TiO2 surfaces and photoelectron injection into TiO2 has been demonstrated.
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