期刊
CURRENT APPLIED PHYSICS
卷 12, 期 6, 页码 1459-1464出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2012.04.012
关键词
Quantum dot-sensitized solar cell; Recombination; Charge-collection efficiency; Electron injection efficiency; Intermediate layer; Energy barrier
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2010-0003968]
- Human Resources Development Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20104010100580]
- Korean Ministry of Knowledge Economy
- National Research Foundation of Korea [2010-0003968] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
ZnS overlayers were deposited on the CdS quantum dot (QD)-assembled TiO2 films, where the CdS QDs were grown on the TiO2 by repeated cycles of the in situ chemical bath deposition (CBD). With increasing the CdS CBD cycles, the CdS QD-assembled TiO2 films were transformed from the TiO2 film partially covered by small CdS QDs (Type I) to that fully covered by large CdS QDs (Type II). The ZnS overlayers significantly improved the overall energy conversion efficiency of both Types I and II. The ZnS overlayers can act as the intermediate layer and energy barrier at the interfaces. However, the dominant effects of the ZnS overlayers were different for the Types I and II. For Type I, ZnS overlayer dominantly acted as the intermediate layer between the exposed TiO2 surface and the electrolyte, leading to the suppressed recombination rate for the TiO2/electrolyte and the significantly enhanced charge-collection efficiency. On the contrary, for Type II, it dominantly acted as the efficient energy barrier at the interface between the CdS QDs and the electrolyte, leading to the hindered recombination rate from the large CdS QDs to the electrolyte and thus enhanced electron injection efficiency. (C) 2012 Elsevier B.V. All rights reserved.
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