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Citation: TAO Li, YANG Yan-Zhen, SHI Cheng-Wu, WU Yu-Cheng, WU Xiao-Yan. Improved Preparation of Benzothiazolium Iodides and Their Application in Dye Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2010, 26(03): 578-582. doi: 10.3866/PKU.WHXB20100324 shu

Improved Preparation of Benzothiazolium Iodides and Their Application in Dye Sensitized Solar Cells

1.
School of Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China; Key Laboratory of Novel Thin FilmSolar Cells, Chinese Academy of Sciences, Hefei 230031, P. R. China; School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China; Postdoctoral Research Workstation, Bengbu Investment Group Co., Ltd., Bengbu 233000, Anhui Province, P. R. China

Received Date: 28 September 2009
Available Online: 28 January 2010

We prepared 3-methyl benzothiazoliumiodide (MBTI) and 2,3-dimethyl benzothiazoliumiodide (DMBTI) by a quaternization reaction of benzothiazole/2-methyl benzothiazole and iodomethane using Teflon-lined, stainless steel autoclaves. The influence of the 2-position methyl group of the benzothiazolium heterocycle on the thermal stability and melting point of benzothiazolium iodides was studied by thermogravimetric analysis and differential scanning colorimetry. The relationship between I-3/I- redox behavior in solution and the Pt counter electrode/solution interface with the benzothiazolium structure was investigated by cyclic voltammetry using a Pt disk ultramicroelectrode and electrochemical impedance spectroscopy (EIS). Dye sensitized solar cells (DSCs) with MBTI and DMBTI were then assembled. The preparation of the benzothiazolium iodides is simple with short reaction time, easy purification, and high yields. Compared with MBTI, DMBTI has a higher melting point and excellent thermal stability. DSCs with an electrolyte solution composed of 0.1 mol·L-1 I2, 0.1 mol·L-1 LiI, 0.6 mol·L-1 1-methyl-3-propylimidazolium iodide (MPII), and 0.3 mol·L-1 DMBTI in γ-butyrolactone gave a short circuit photocurrent density of 16.91 mA·cm-2, an open circuit voltage of 0.65 V and a fill factor of 0.57. This corresponds to a photoelectric conversion efficiency of 6.28% at the illumination (air mass 1.5, 100 mW·cm-2).
- Dye sensitized solar cell,
- Benzothiazoliumiodide,
- Preparation,
- Characteristic,
- Autoclave
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