TiO2微球的合成及其作为散射层在量子点敏化太阳能电池中的应用

doi:10.3866/PKU.WHXB201404111

Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (6): 1107-1112.doi: 10.3866/PKU.WHXB201404111

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles Next Articles

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

BAI Shou-Li¹, LU Wen-Hu^1,2, LI Dian-Qing¹, LI Xiao-Ning², FANG Yan-Yan², LIN Yuan²

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:2014-02-27 Revised:2014-04-11 Published:2014-05-26
Contact: LI Dian-Qing, LIN Yuan E-mail:lidq@mail.buct.edu.cn;linyuan@iccas.ac.cn
Supported by:
The project was supported by the National Key Basic Research Program of China (973) (2012CB932903).

Abstract

Abstract:

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.

Key words: Mesoporous TiO₂ microsphere, Chemical bath deposition, CdS/CdSe quantum dot, Scattering layer

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 Phys. -Chim. Sin. 2014, 30(6), 1107-1112. doi: 10.3866/PKU.WHXB201404111

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

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