Publication date: 1st April 2013
Recently, molecular metal chalcogenide complexes (MCCs) have attracted much attention as precursors for mesoporous metal chalcogenides and semiconducting films with high mobility. Mitzi et al[1,2] firstly used hydrazine as a solvent and excess chalcogen (S or Se) to improve the solubility and film-forming properties, as a result of the formation of highly soluble MCC precursors that can be solution processed into thin-film form and decomposed to the starting metal chalcogenide at low temperature. Here we demonstrated that MCCs can also serve as precursors for semiconductor quantum dots in semiconductor sensitized solar cells, which combines the benefit of high coverage of semiconductor on oxide with the advantage of linker-free, direct contact between semiconductor and oxide. The utility of MCC precursors is demonstrated for a model system, SnSe2 sensitized TiO2 photoanodes. In addition, we developed a novel and simple fabrication method for Cu2S counter electrode that involves the usage of N4H9Cu7S4 solution as a precursor, which could easily be employed for large-scale production of counter electrodes. The CdS/CdSe co-sensitized TiO2 solar cells with Cu2S counter electrode employing N4H9Cu7S4 solution as precursors exhibited superior performance comparing with those with Pt counter electrode and Cu2S counter electrode from brass foil.
[1] Mitzi, D. B. Synthesis, Structure, and Thermal Properties of Soluble Hydrazinium Germanium(IV) and Tin(IV) Selenide Salts Inorg Chem 2005, 44, 3755-3761. [2] Mitzi, D. B.; Kosbar, L. L.; Murray, C. E.; Copel, M.; Afzali, A. High-mobility Ultrathin Semiconducting Films Prepared by Spin Coating. Nature 2004, 428, 299-303.
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