Fast Charge Separation at Semiconductor Sensitizer−Molecular Relay Interface Leads to Significantly Enhanced Solar Cell Performance
Fast Charge Separation at Semiconductor Sensitizer−Molecular Relay Interface Leads to Significantly Enhanced Solar Cell Performance
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DOI：
10.1021/acs.jpcc.5b03313
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发表时间：
2015-04
影响因子：
3.7
通讯作者：
Chao Shen;Xingzhu Wang;Xiao-Fang Jiang;Hai Zhu;Feng Li;Jing Yang;Qinghua Xu;Qing Wang
中科院分区：
文献类型：
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作者：
Chao Shen;Xingzhu Wang;Xiao-Fang Jiang;Hai Zhu;Feng Li;Jing Yang;Qinghua Xu;Qing Wang
我们报告了一种有效的策略，以提高效率和稳定性的液体结阴极敏化太阳能电池采用钴联吡啶络合物为基础的电解质。以CdS敏化的TiO 2为模型体系，研究了在CdS表面接枝小分子4′-（双（4-（己氧基）苯基）氨基）联苯-4-羧酸（PAPC）后，电池性能得到显著改善，能量转换效率达到前所未有的水平。瞬态吸收测量结果表明，光生空穴在CdS中被接枝的PAPC分子瞬间拦截，极大地促进了电荷分离，从而稳定了CdS。我们相信这样的概念可以应用于其他半导体敏化剂，特别是对于那些具有上级光吸收的敏化剂，例如CdSe、CdTe等。
We report on an effective strategy to improve the efficiency and stability of liquid junction semiconductor-sensitized solar cells employing cobalt bipyridyl complex-based electrolyte. With CdS-sensitized TiO2 as a model system, we demonstrate that grafting the surface of CdS with small relay molecule, 4′-(bis(4-(hexyloxy)phenyl)amino)biphenyl-4-carboxylic acid (PAPC), drastically improves the cell performance and leads to an unprecedented power conversion efficiency. Transient absorption measurement indicates the photogenerated holes in CdS could be instantaneously intercepted by the grafted PAPC molecules, which greatly facilitates the charge separation and thus stabilizes CdS. We believe such a concept could be applied to other semiconductor sensitizers, especially for those with superior light absorption, such as CdSe, CdTe, etc.