Studies on the optical and photoelectric properties of anthocyanin and chlorophyll as natural co-sensitizers in dye sensitized solar cell
Studies on the optical and photoelectric properties of anthocyanin and chlorophyll as natural co-sensitizers in dye sensitized solar cell
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DOI：
10.1016/j.optmat.2017.07.036
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发表时间：
2017-11
影响因子：
3.9
通讯作者：
Hui Nan;Heping Shen;G. Wang;Shou-Dong Xie;Guijun Yang;Hong Lin;Hong Lin
中科院分区：
文献类型：
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作者：
Hui Nan;Heping Shen;G. Wang;Shou-Dong Xie;Guijun Yang;Hong Lin;Hong Lin
分别从巨金花和柏树叶中提取的花青素和叶绿素作为染料敏化太阳能电池的天然敏化剂，研究了它们的光学和电化学性质。UV-Vis吸收测量表明，两种染料的混合物能够在300 nm-700 nm的波长范围内增强和更宽的吸收，相比于每个单一染料。FTIR结果表明，花青素在TiO 2膜上的吸附是化学吸附，而叶绿素在TiO 2膜上的吸附是物理吸附。从电化学分析中计算了每种染料和不同比例的染料混合物在TiO 2/染料/电解质界面上的能级偏移，这些能级偏移影响电子注入和染料再生效率。发现混合物中两种染料的最佳比例为0.2：5，既能产生足够的电荷转移驱动力，又能产生最小的能量损失。通过将该混合物作为共吸附敏化剂加入到太阳能电池中，与单一染料敏化体系相比，光伏性能得到显著改善。
Anthocyanin and Chlorophyll extracted from Troll flower and Cypress leaf respectively are used as natural sensitizers in dye sensitized solar cells (DSCs), with their optical and electrochemical properties investigated. UV–Vis absorption measurement showed that the mixture of two dyes enabled an enhanced and wider absorption in the wavelength range of 300 nm–700 nm compared to each single dye. FTIR results proved that anthocyanin is chemically adsorbed onto the TiO2film, while it is physical adsorption for chlorophyll. The energy level offsets on the TiO2/dye/electrolyte interface for each dye and the dye mixture with different ratios were calculated from the electrochemical analysis, which affect the electron injection and dye regeneration efficiencies. The optimized ratio of the two dyes in the mixture was found to be ∼2:5, inducing both sufficient charge transfer driving force and minimal energy loss. By incorporating this mixture into the solar cell as co-adsorbing sensitizer, the photovoltaic performance was prominently improved compared with the single dye sensitization system.