Citation: LAO Chun-Feng, CHU Zeng-Ze, ZOU De-Chun. Self-Assembly of 3-Aminopropyltrimethoxysilane to Improve the Efficiency of Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 419-424. doi: 10.3866/PKU.WHXB20110209 shu

Self-Assembly of 3-Aminopropyltrimethoxysilane to Improve the Efficiency of Dye-Sensitized Solar Cells

1.
1. Research and Development Center of Haier Group, Qingdao 266103, Shandong Province, P. R. China;
2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 13 September 2010
Available Online: 22 December 2010
Fund Project: 国家自然科学基金(50125310, 90401028) (50125310, 90401028)国家重点基础研究发展规划项目(973) (2002CB613405)资助 (973) (2002CB613405)

A dye-sensitized solar cell (DSSC) based on a 3-aminopropyltrimethoxysilane (APTS)- modified TiO₂ electrode was fabricated. This cell generated a short current of 18.32 mA·cm^-2, an open voltage of 775.9 mV, and its overall photo-to-electricity conversion efficiency was 9.15% under 100 mW·cm^-2 white light irradiation from a xenon lamp. The three DSSC parameters for the bare TiO₂ electrode were found to be 18.08 mA·cm^-2, 749.9 mV, and 7.70%. Compared with the unmodified solar cell, the overall conversion efficiency improved by 18.8% and the fill factor improved from 0.57 to 0.64. This improvement is attributed to the inhibition of the back reaction at the interface between the semiconductor and the electrolyte. The dark current-applied voltage curve shows that the onset voltage shifts from -0.30 to -0.40 V, which indicates a reduction in defects and surface states on the TiO2 surface because of the presence of APTS. Furthermore, special experiments were conducted to investigate the interaction among TiO₂, APTS, and the cis-Ru(dcpyH₂)₂(SCN)₂ dye. In these experiments, APTS and the dye were self- assembled onto a TiO₂ electrode in layers. The interaction was characterized by X-ray photoelectron spectroscopy (XPS). Qualitative and quantitative results showed that the ―OCH₂CH₃ was partially removed and it formed mono-bridge or bi-bridge Si―O―Ti bonds. The cis-Ru(dcpyH₂)₂(SCN)₂ dye adsorbed onto APTS through an electrostatic interaction between ―COOH and ―NH₂ from the dye. FT-IR spectra further confirmed this inner interaction.
- Dye-sensitized solar cell,
- 3-Aminopropyltrimethoxysilane,
- Self-assembly,
- TiO₂,
- X-ray photoelectron spectroscopy
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