Hao Yan, Gabrielsson Erik, Lohse Peter William, Yang Wenxing, Johansson Erik M J, Hagfeldt Anders, Sun Licheng, Boschloo Gerrit
Department of Chemistry-Ångström Laboratory Center of Molecular Devices Uppsala University Box 523 751 20 Uppsala Sweden.
Organic Chemistry Centre of Molecular Devices Department of Chemistry Chemical Science and Engineering Royal Institute of Technology (KTH) SE-10044 Stockholm Sweden.
Adv Sci (Weinh). 2015 Sep 1;2(11):1500174. doi: 10.1002/advs.201500174. eCollection 2015 Nov.
Investigation of charge transfer dynamics in dye-sensitized solar cells is of fundamental interest and the control of these dynamics is a key factor for developing more efficient solar cell devices. One possibility for attenuating losses through recombination between injected electrons and oxidized dye molecules is to move the positive charge further away from the metal oxide surface. For this purpose, a metal-free dye named E6 is developed, in which the chromophore core is tethered to two external triphenylamine (TPA) units. After photoinduced electron injection into TiO, the remaining hole is rapidly transferred to a peripheral TPA unit. Electron-hole recombination is slowed down by 30% compared to a reference dye without peripheral TPA units. Furthermore, it is found that the added TPA moieties improve the electron blocking effect of the dye, retarding recombination of electrons from TiO to the cobalt-based electrolyte.
研究染料敏化太阳能电池中的电荷转移动力学具有重要的基础意义，而控制这些动力学是开发更高效太阳能电池器件的关键因素。通过注入电子与氧化染料分子之间的复合来减少损失的一种可能性是将正电荷进一步移离金属氧化物表面。为此，开发了一种名为E6的无金属染料，其中发色团核心与两个外部三苯胺（TPA）单元相连。光致电子注入TiO₂后，剩余的空穴迅速转移到外围的TPA单元。与没有外围TPA单元的参考染料相比，电子 - 空穴复合速度减慢了30%。此外，发现添加的TPA部分改善了染料的电子阻挡效应，延缓了电子从TiO₂到钴基电解质的复合。
