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
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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.
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