期刊
ADVANCED FUNCTIONAL MATERIALS
卷 19, 期 4, 页码 604-609出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200800940
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- National Science Council of Taiwan [NSC 96-2218-E-006-006, NSC 96-2221-E-006-058]
Cadmium sulfide (CdS) and cadmium selenide (CdSe) quantum dots (QDs) are sequentially assembled onto a nanocrystalline TiO2 film to prepare a CdS/CdSe co-sensitized photoelectrode for QD-sensitized solar cell application. The results show that CdS and CdSe QDs have a complementary effect in the light harvest and the performance of a QDs co-sensitized solar cell is strongly dependent on the order of CdS and CdSe respected to the TiO2. In the cascade structure of TiO2/CdS/CdSe electrode, the re-organization of energy levels between CdS and CdSe forms a stepwise structure of band-edge levels which is advantageous to the electron injection and hole-recovery of CdS and CdSe QDs. An energy conversion efficiency of 4.22% is achieved using a TiO2/CdS/CdSe/ZnS electrode, under the illumination of one sun (AM1.5, 100 mW cm(-2)). This efficiency is relatively higher than other QD sensitized solar cells previously reported in the literature.
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