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Title: CdSe-sensitized mesoscopic TiO 2 solar cells exhibiting >5% efficiency: Redundancy of CdS buffer layer
Authors: Hossain, M.A.
Jennings, J.R. 
Shen, C. 
Pan, J.H.
Koh, Z.Y. 
Mathews, N.
Wang, Q. 
Issue Date: 28-Aug-2012
Citation: Hossain, M.A., Jennings, J.R., Shen, C., Pan, J.H., Koh, Z.Y., Mathews, N., Wang, Q. (2012-08-28). CdSe-sensitized mesoscopic TiO 2 solar cells exhibiting >5% efficiency: Redundancy of CdS buffer layer. Journal of Materials Chemistry 22 (32) : 16235-16242. ScholarBank@NUS Repository.
Abstract: Semiconductor-sensitized TiO 2 solar cells employing CdSe as a light absorber demonstrate superior photovoltaic performance to the best-performing cascaded CdS/CdSe cells with practically identical optical density in the study. A careful comparison between CdSe and CdS/CdSe sensitized cells reveals that while CdS can greatly promote the subsequent growth of CdSe in the cascade electrodes and hence light harvesting, the presence of a CdS buffer layer impedes the injection of electrons from CdSe to TiO 2 and accelerates charge recombination at the TiO 2/sensitizer interface. As a result, better performance was achieved with CdSe-sensitized solar cells when light absorption is identical to that of CdS/CdSe cells, making the CdS buffer layer redundant. CdSe-sensitized TiO 2 solar cells incorporating light scattering layers and an aqueous polysulfide electrolyte yielded an unprecedented power conversion efficiency of up to 5.21% under simulated AM 1.5, 100 mW cm -2 illumination. © The Royal Society of Chemistry 2012.
Source Title: Journal of Materials Chemistry
ISSN: 09599428
DOI: 10.1039/c2jm33211f
Appears in Collections:Staff Publications

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