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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2013,Vol.29>> Issue(06)>> 1240-1246     doi: 10.3866/PKU.WHXB201303261         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
Electron Injection and Photovoltaic Properties in CdSe/ZnS Quantum Dot Sensitized Solar Cells
GUO Xu-Dong, Ma Bei-Bei, WANG Li-Duo, GAO Rui, DONG Hao-Peng, QIU Yong
Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
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CdSe/ZnS core/shell quantum dots (QDs) were synthesized and adsorbed onto nanocrystalline TiO2 films for application in quantum dot sensitized solar cells(QDSSCs). Femtosecond transient absorption spectra was measured to investigate the effect of the ZnS shell coating on electron injection from CdSe QDs to nanocrystalline TiO2 films. The results showed a decrease in electron injection rate from 7.14×1011s-1 to 2.38×10-11s-1 after ZnS shell coating, which means the electron injection rate only remained 1/3. The fill factor(FF) and stability of QDSSCs were improved by ZnS coating, but the photocurrent decreased, resulting in an overall decrease in efficiency. The slower electron injection rate is found to be the main cause for this decrease in photocurrent and efficiency, which matches well with the photovoltaic property test. These results provide information for optimizing the current and efficiency of QDSSCs employing core/shell QDs.



Keywords: CdSe/ZnS quantum dots   ZnS coating   Quantum dot sensitized solar cell   Electron injection rate   Femtosecond transient absorption spectra  
Received: 2012-12-19 Accepted: 2013-03-25 Publication Date (Web): 2013-03-26
Corresponding Authors: Email: chldwang@mail.tsinghua.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (51273104) and National Key Basic Research and Development Program of China (973) (2009CB930602).

Cite this article: GUO Xu-Dong, Ma Bei-Bei, WANG Li-Duo, GAO Rui, DONG Hao-Peng, QIU Yong. Electron Injection and Photovoltaic Properties in CdSe/ZnS Quantum Dot Sensitized Solar Cells[J]. Acta Phys. -Chim. Sin., 2013,29 (06): 1240-1246.    doi: 10.3866/PKU.WHXB201303261

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