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Quantum dots co-sensitized solar cells: a new assembly process of CdS/CdSe linked to mesoscopic TiO2-nano-SiO2 hybrid film

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Abstract

A green and simple method was found to prepare CdS/CdSe co-sensitized photoelectrodes for the quantum dots sensitized solar cells application. All the assembly processes of CdS and CdSe quantum dots (QDs) were carried out in aqueous solution. CdS and CdSe QDs were sequentially assembled onto TiO2-nano-SiO2 hybrid film by two steps. Firstly, CdS QDs were deposited in situ over TiO2-nano-SiO2 hybrid film by the successive ionic layer adsorption and reaction (SILAR) process in water. Secondly, using 3-mercaptopropionic acid (3-MPA) as a linker molecule, the pre-prepared colloidal CdSe QDs (~3.0 nm) dissolved in water was linked onto the TiO2-nano-SiO2 hybrid film by the self-assembled monolayer technique with the mode of dropwise. The mode is simple and advantageous to saving materials and time. The results show that the photovoltaic performance of the cells is enhanced with the increase of SILAR cycles for TiO2-nano-SiO2/CdS photoelectrode. The power conversion efficiency of 2.15 % was achieved using the co-sensitization photoelectrode prepared by using 6 SILAR cycles of CdS plus CdSe (TiO2-nano-SiO2/CdS(6)/CdSe) under the illumination of one sun (AM1.5, 100 mW/cm2).

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Acknowledgments

The work was supported by the Natural Science Foundation of Anhui Province (No. 11040606Q45), the Research Fund for the Doctoral Program of Higher Education of China (Nos. 20110111120002 and 20110111110002), and the Technical Plan Project of Huainan City (2102A00904).

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Authors and Affiliations

  1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Renbao Wang, Lei Wan, Qiong Ma, Shiding Miao & Jinzhang Xu

  2. School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan, 232001, People’s Republic of China

    Renbao Wang

  3. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Haihong Niu

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  1. Renbao Wang
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  2. Lei Wan
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  3. Haihong Niu
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  4. Qiong Ma
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  5. Shiding Miao
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  6. Jinzhang Xu
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Correspondence to Jinzhang Xu.

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Wang, R., Wan, L., Niu, H. et al. Quantum dots co-sensitized solar cells: a new assembly process of CdS/CdSe linked to mesoscopic TiO2-nano-SiO2 hybrid film. J Sol-Gel Sci Technol 67, 458–463 (2013). https://doi.org/10.1007/s10971-013-3101-y

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