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巯基丙酸分子对CdSe核壳量子点和 ZnO纳米粒子薄膜之间电荷转移的影响
Effect of Mercaptopropionic Acid Molecules on Electron Transfer from CdSe Core/Shell Quantum Dots to ZnO Nanocrystal Films
- 发光学报 2012年33卷第1期 页码：26-31
- 作者机构：
发光学及应用国家重点实验室 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
- 作者简介：
- 基金信息：国家自然科学基金(10874179和60976049)资助项目()
DOI：10.3788/fgxb20123301.0026
中图分类号： O482.31收稿日期：2011-08-30，
修回日期：2011-11-01，
网络出版日期：2012-01-10，
纸质出版日期：2012-01-10
- 稿件说明：
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邵聪, 刘学彦, 赵家龙. 巯基丙酸分子对CdSe核壳量子点和 ZnO纳米粒子薄膜之间电荷转移的影响[J]. 发光学报, 2012,33(1): 26-31
SHAO Cong, LIU Xue-yan, ZHAO Jia-long. Effect of Mercaptopropionic Acid Molecules on Electron Transfer from CdSe Core/Shell Quantum Dots to ZnO Nanocrystal Films[J]. 发光学报, 2012,33(1): 26-31
邵聪, 刘学彦, 赵家龙. 巯基丙酸分子对CdSe核壳量子点和 ZnO纳米粒子薄膜之间电荷转移的影响[J]. 发光学报, 2012,33(1): 26-31 DOI： 10.3788/fgxb20123301.0026.
SHAO Cong, LIU Xue-yan, ZHAO Jia-long. Effect of Mercaptopropionic Acid Molecules on Electron Transfer from CdSe Core/Shell Quantum Dots to ZnO Nanocrystal Films[J]. 发光学报, 2012,33(1): 26-31 DOI： 10.3788/fgxb20123301.0026.
摘要
通过稳态光谱和时间分辨荧光光谱研究了巯基丙酸(MPA)分子对由量子点到ZnO纳米粒子薄膜的电荷转移过程的影响。研究发现
相对于CdSe纳米粒子薄膜样品
没有MPA分子参与作用的CdSe/ZnO薄膜样品和有MPA分子连接的CdSe/MPA/ZnO薄膜样品中都存在从CdSe量子点到ZnO纳米粒子薄膜的有效电荷分离过程
但是相对于CdSe/ZnO样品
CdSe/MPA/ZnO样品中电荷转移速率明显变小。这表明MPA分子本身它并不能促进CdSe到ZnO电荷分离过程
因此可以认为用金属氧化物薄膜直接吸附量子点吸收材料
将能获得高功率转换效率的量子点敏化太阳能电池。
Abstract
The effect of mercaptopropionic acid (MPA) molecules on the charge transfer process from the quantum dots to ZnO nanocrystal films was studied in this paper by the steady-state and time-resolved photoluminescence spectroscopy. The obtained high efficiently photoluminescent CdSe-core CdS/ZnS-multishell quantum dots with few defects are air stable in quantum dot based devices. Three samples were prepared to make the measurements of time-resolved photoluminescence spectra
CdSe quantum dots film
CdSe quantum dots spun cast on ZnO nanocrystal film (CdSe/ZnO)
and MPA molecules linked CdSe quantum dots and ZnO nanocrystal film (CdSe/MPA/ZnO). The shortening of photoluminescence life times of CdSe quantum dots deposited on ZnO nanocrystal films with and without MPA molecules indicated the electron transfer process happened in the interface between CdSe quantum dots and ZnO nanocrystals. But the decreased rate of electron transfer from CdSe quantum dots to ZnO nanocrystal films with MPA molecules was found
compared to the electron transfer rate of the CdSe/ZnO sample. Considering the fact that MPA molecules did not improve the charge transfer process from CdSe quantum dots to ZnO nanocrystal films
it was indicated that the MPA molecules was not a good choice in CdSe quantum dot sensitized solar cell. The experimental result suggested that the direct adsorption of CdSe quantum dots on metal oxide nanocrystal films would obtain quantum dot sensitized solar cell with higher power conversion efficiency.
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references
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