Citation: LI Wen-Zhe, WANG Li-Duo, GAO Rui, DONG Hao-Peng, NIU Guang-Da, GUO Xu-Dong, QIU Yong. Transforming Organic Ligands into a ZnS Protective Layer through the S^2- Intermediate State in ex situ CdSe Quantum Dot Devices[J]. Acta Physico-Chimica Sinica, ;2013, 29(11): 2345-2353. doi: 10.3866/PKU.WHXB201309242 shu

Transforming Organic Ligands into a ZnS Protective Layer through the S^2- Intermediate State in ex situ CdSe Quantum Dot Devices

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

Received Date: 8 July 2013
Available Online: 24 September 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)

In this paper, the tri-n-octylphosphine oxide (TOPO) ligand on CdSe quantum dots (QDs) are changed to ZnS coating layer through S^2- intermediate state. After ligand exchange, the Fourier transform infrared (FTIR) spectra indicate that the long chain organic ligands are replaced by S^2- ions. After ionic reaction, the generation of ZnS is confirmed by X-ray photoelectron spectroscopy (XPS) measurements. In addition the UV-Vis absorption peaks did not move and transmission electron microscopy (TEM) results show that the diameters of the quantum dots decrease. Electrochemical impedance spectroscopy (EIS) results show that the interface resistance between the TiO₂/QDs/electrolyte is reduced under illumination conditions, meaning that forward electron transport was enhanced. In addition, the intensity-modulated photovoltage spectroscopy (IMVS) and intensity-modulated photocurrent spectroscopy (IMPS) results reveal an increase in the electronic lifetime and diffusion rate increased. Finally, the conversion efficiency increases by 1.78 times from 0.98% (TOPO ligand) to 1.75% (ZnS coating).
- Quantum dot sensitized solar cell,
- Inorganic ligand,
- ZnS coating,
- Ligand exchange,
- Ionic reaction,
- CdSe quantum dot
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Transforming Organic Ligands into a ZnS Protective Layer through the S2- Intermediate State in ex situ CdSe Quantum Dot Devices

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通讯作者: 陈斌, bchen63@163.com

Transforming Organic Ligands into a ZnS Protective Layer through the S^2- Intermediate State in ex situ CdSe Quantum Dot Devices