Highly efficient quantum-dot-sensitized solar cell based on co-sensitization of CdS/CdSe

Yuh-Lang Lee, Yi Siou Lo

Research output: Contribution to journalArticlepeer-review

994 Citations (Scopus)

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 languageEnglish
Pages (from-to)604-609
Number of pages6
JournalAdvanced Functional Materials
Volume19
Issue number4
DOIs
Publication statusPublished - 2009 Feb 24

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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