Citation: BAI Shou-Li, LU Wen-Hu, LI Dian-Qing, LI Xiao-Ning, FANG Yan-Yan, LIN Yuan. Synthesis of Mesoporous TiO₂ Microspheres and Their Use as Scattering Layers in Quantum Dot Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2014, 30(6): 1107-1112. doi: 10.3866/PKU.WHXB201404111 shu

Synthesis of Mesoporous TiO₂ Microspheres and Their Use as Scattering Layers in Quantum Dot Sensitized Solar Cells

1.
1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
2 Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 27 February 2014
Available Online: 5 May 2014
Fund Project:

Mesoporous TiO₂ microspheres (MSs) were successfully synthesized by the direct hydrolysis of TiCl₄ in ethanol aqueous solution using cetyltrimethyl ammonium bromide (CTAB) as a template. X-ray diffraction (XRD) revealed a rutile structure for TiO₂ in all the products. Scanning electron microscopy (SEM) revealed that the TiO₂ microspheres had an average diameter of 700 nm, and they were composed of packed nanoparticles that had a mean size of about 16 nm. Films with or without TiO₂ microspheres, as a scattering layer on top of the TiO₂ nanocrystalline layer, were prepared by the doctor-blade method. CdS/ CdSe quantum dots (QDs) were grown on films by chemical bath deposition (CBD) to form QD sensitized solar cells (QDSCs). Ultraviolet-visible and diffuse reflectance spectra showed that these micro-spherical structures were favorable for the deposition of QDs and a relatively higher light scattering effect was observed. This effectively enhanced light harvesting and led to an increase in the photocurrent of the QDSCs. As a result, a power conversion efficiency of 4.5% was obtained, which is 27.7% higher than that of QDSCs without scattering layers and 10.2% higher than that of QDSCs with traditional scattering layers composed of 20 and 400 nm TiO₂ solid particles. We attribute this improvement to their higher light scattering effect and longer electron lifetimes.
- Mesoporous TiO₂ microsphere,
- Chemical bath deposition,
- CdS/CdSe quantum dot,
- Scattering layer
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沈阳化工大学材料科学与工程学院沈阳 110142

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南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com

Synthesis of Mesoporous TiO₂ Microspheres and Their Use as Scattering Layers in Quantum Dot Sensitized Solar Cells