Citation: WANG Li-Juan, LI Qi, HAO Yan-Zhong, SHEN Shi-Gang, XU Dong-Sheng. Improvement of Quantum Dot Coverage of CdS/CdSe/TiO₂ Hierarchical Hollow Sphere Photoanodes[J]. Acta Physico-Chimica Sinica, ;2016, 32(4): 983-989. doi: 10.3866/PKU.WHXB201603144 shu

Improvement of Quantum Dot Coverage of CdS/CdSe/TiO₂ Hierarchical Hollow Sphere Photoanodes

1.
1. College of Chemistry and Environmental Science, Hebei University, Baoding 071002, Hebei Province, P. R. China;
2.
2. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
3.
3. College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, P. R. China

Corresponding author: SHEN Shi-Gang, XU Dong-Sheng,
Received Date: 26 February 2016
Available Online: 14 March 2016
Fund Project: 国家自然科学基金(21133001, 21303004) (21133001, 21303004) 国家重点基础研究发展规划项目(973) (2013CB932601, 2014CB239303) (973) (2013CB932601, 2014CB239303)河北省自然科学基金(B2014208062)资助 (B2014208062)

TiO₂ hierarchical hollow spheres (THHSs) are considered an ideal material for photoanodes of CdS/CdSe quantum dot-sensitized solar cells (QDSSCs) because of their high specific surface area, strong light scattering effect, and excellent charge transfer capability. However, in a typical CdS/CdSe quantum dot deposition process, chemical bath deposition, the coverage of the CdS/CdSe quantum dots is relatively low (~50%). According to the different surface properties of CdS/CdSe quantum dots and TiO₂, we have developed a novel route to increase the quantum dot coverage while preventing their aggregation. In our method, 1-dodecanethiol was used as a surface protection molecule on the quantum dots. Then, in the secondary chemical bath deposition process, the newly emerged quantum dots grew only on the TiO₂ surface and thus the coverage notably increased. Eventually, the quantum dot coverage reached 85.4%. This method effectively enhanced light utilization and led to an increase in the photocurrent of the QDSSCs. The reduced blank surface of TiO₂ also efficiently suppressed electron-hole recombination. Thus, the photocurrent density was 15.69 mA·cm^-2, the fill factor was 0.583, and the voltage was 0.605 V. As a result, a power conversion efficiency of 5.30% was obtained.
- Surface coverage,
- Secondary deposition,
- CdS/CdSe quantum dot,
- Solar cell
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Improvement of Quantum Dot Coverage of CdS/CdSe/TiO2 Hierarchical Hollow Sphere Photoanodes

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通讯作者: 陈斌, bchen63@163.com

Improvement of Quantum Dot Coverage of CdS/CdSe/TiO₂ Hierarchical Hollow Sphere Photoanodes