Photocurrent Enhancement of Hemicyanine Dyes Containing RSO3- Group through Treating TiO2 Films with Hydrochloric Acid
Photocurrent Enhancement of Hemicyanine Dyes Containing RSO3- Group through Treating TiO2 Films with Hydrochloric Acid
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DOI：
10.1021/jp010667n
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发表时间：
2001-08
影响因子：
3.3
通讯作者：
Zhong‐Sheng Wang;and Fuyou Li;Chunhui Huang
中科院分区：
文献类型：
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作者：
Zhong‐Sheng Wang;and Fuyou Li;Chunhui Huang
合成了2-[4-（二甲氨基）苯基]苯并噻唑丙基磺酸盐（BTS）和2-[4-（二甲氨基）苯基]-3,3-二甲基苯并噻唑丙基磺酸盐（IDS）两种半苯胺染料，并对其紫外可见性、荧光性和氧化还原性进行了表征。这两种染料在hcl处理的纳米TiO2薄膜上表现出优异的电荷转移性能，在最大吸收波长处入射单色光子到电子转换效率（IPCE）接近100%。该处理显著改善了短路光电流，BTS和IDS分别增加了99%和329%。因此，由于光电流增强，总体产量显著提高：BTS从3.1%增加到5.1%，增加66%，IDS从1.3%增加到4.8%，增加260%。这一现象可以解释为在HCl处理下，TiO2的平带电位发生了正位移，吸附的染料分子数量增加。IPCE、短路光电流和…
Two kinds of hemicyanine dyes, 2-[4-(dimethylamino)styryl]benzothiazolium propylsulfonate (BTS) and 2-[4-(dimethylamino)styryl]-3,3-dimethylindolium propylsulfonate (IDS), were synthesized and characterized with respect to their UV−vis, fluorescence, and redox properties. Both dyes show outstanding properties for charge transfer on HCl-treated nanocrystalline TiO2 films with near 100% incident monochromatic photon-to-electron conversion efficiency (IPCE) at the maximum absorption wavelength. This treatment was found to improve short-circuit photocurrent significantly, with increases by 99% and 329% for BTS and IDS, respectively. Overall yields were hence improved remarkably as a result of photocurrent enhancement: BTS increased by 66% from 3.1% to 5.1% and IDS increased by 260% from 1.3% to 4.8%. This phenomenon can be explained by the positive shift of flat band potential for TiO2 and the increased amount of adsorbed dye molecules upon HCl treatment. The values for IPCE, short-circuit photocurrent, and ...