Abstract
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, 100mW cm-2). This efficiency is relatively higher than other QD-sensitized solar cells previously reported in the literature.
Original language | English |
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Pages (from-to) | 604-609 |
Number of pages | 6 |
Journal | Advanced Functional Materials |
Volume | 19 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2009 Feb 24 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- General Chemistry
- General Materials Science