Citation: 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 Physico-Chimica Sinica, ;2013, 29(06): 1240-1246. doi: 10.3866/PKU.WHXB201303261 shu

Electron Injection and Photovoltaic Properties in CdSe/ZnS Quantum Dot Sensitized Solar Cells

1.
Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China

Received Date: 19 December 2012
Available Online: 26 March 2013
Fund Project: 国家自然科学基金(51273104) (51273104)国家重点基础研究发展规划项目(973)(2009CB930602)资助 (973)(2009CB930602)

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.
- CdSe/ZnS quantum dots,
- ZnS coating,
- Quantum dot sensitized solar cell,
- Electron injection rate,
- Femtosecond transient absorption spectra
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