Effect of different trap states on the electron transport of photoanodes in dye sensitized solar cells
Effect of different trap states on the electron transport of photoanodes in dye sensitized solar cells
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不同陷阱态对染料敏化太阳能电池光电阳极电子传输的影响
DOI：
10.1016/j.jpowsour.2014.01.086
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发表时间：
2014
影响因子：
9.2
通讯作者：
Han Liyuan
中科院分区：
文献类型：
--
作者：
Zhang Jing;Feng Jiangwei;Hong Yang;Zhu Yuejin;Han Liyuan
陷阱态在染料敏化太阳能电池的电子传输过程中起着重要的作用。不同的陷阱状态(表面陷阱和体陷阱)对DSC性能的贡献是不同的。然而，目前对陷阱态的分类还很欠缺，尤其是在最近的光阳极掺杂工作中。在本工作中，TiO2中Ce4+(摩尔比为0.3、0.6和0.9%)和SnO2中的Ti4+(摩尔比分别为15、40和70%)分别为表面陷阱和表面与体相共存的陷阱。表征了各陷阱态的性质及其对电子输运的影响。表面陷阱和体陷阱都恶化了电子的输运，但是表面陷阱的负面作用可以通过表面修饰而不是体陷阱来消除。此外，与文献中陷阱态加速界面复合的文献相反，发现界面电子复合时间随着Ce4+在TiO2中的表面陷阱和Ti4+在SnO2中的体陷阱的增加而延长，表明复合时间与陷阱态的性质密切相关。
Trap states play important role in electron transport of dye sensitized solar cells (DSSCs). Different trap states (surface and bulk traps) contribute differently to the performance of DSSCs. However, there is a lack of classification of the trap states, especially in recent doping works of the photoanodes. In this work, the Ce4+(0.3, 0.6 and 0.9% molar ratio) in TiO2and Ti4+(15, 40 and 70% molar ratio) in SnO2are assigned to surface traps and surface-and-bulk coexisted traps, respectively. The property of each trap state and its influence to the electron transport are characterized. Both the surface and bulk traps deteriorate the electron transport in DSSCs, however, the negative role of surface traps can easily be eliminated by surface modification in contrast to the bulk traps. Furthermore, contrary to the literature that the trap states will accelerate the interface recombination, it is found that the interface electron recombination time is prolonged with Ce4+surface traps in TiO2and Ti4+bulk traps in SnO2, indicating that the recombination time is closely related to the property of the trap states.