Building Double Branch Dyes with Acetylenic Bonds: An Effective Strategy to Enhance the Efficiency of Dye‐Sensitized Solar Cells,Solar RRL

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Building Double Branch Dyes with Acetylenic Bonds: An Effective Strategy to Enhance the Efficiency of Dye‐Sensitized Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-11-04 , DOI: 10.1002/solr.202000622
Kai Chen ₁ , Nan Han ₁ , Weitao Shao ₁ , Jing Xiao _{2,

3} , Shupeng Zhang ₁ , Zhiyuan Zheng ₁ , Guang Shao _{2,

3} , Jing-Kun Fang ₁

Affiliation

Double branch (DB) dyes could reduce intermolecular interactions and realize good photovoltaic performances. Herein, symmetric DB dyes (FSDD‐1 and FSDD‐2) featuring with one and two acetylenic bonds as the isolation groups are reported. The corresponding single branch (SB) dye FSSD‐EH is synthesized for comparison. For the adsorption spectra, bathochromic shifts and higher ε are observed for DB dyes FSDD‐1 and FSDD‐2 compared with SB dye FSSD‐EH, which suggests better light‐harvesting capabilities for the DB dyes. Dye‐sensitized solar cells (DSSCs) sensitized by DB dyes FSDD‐1 and FSDD‐2 exhibit significant increases for the J_sc and V_oc compared with SB dye FSSD‐EH, so much better η are achieved by the DB dyes (5.34, 7.14, and 2.46% for FSDD‐1, FSDD‐2, and FSSD‐EH, respectively). FSDD‐2 with a diyne unit exhibits higher η compared with FSDD‐1 with an yne unit as the isolation groups. The research shows that a much better photovoltaic performance of DSSCs can be achieved after connecting two dye molecules to be a DB dye by adopting acetylenic bonds as the isolation group. A longer distance between the two branches realized by a diyne unit is beneficial and effective to achieve better photovoltaic performance.

中文翻译：

用乙炔键构建双支染料：提高染料敏化太阳能电池效率的有效策略

双支（DB）染料可以减少分子间的相互作用并实现良好的光伏性能。本文报道了对称DB染料（FSDD-1和FSDD-2）具有一个和两个炔键作为隔离基团。合成了相应的单支（SB）染料FSSD-EH进行比较。对于吸附光谱，与SB染料FSSD-EH相比，DB染料FSDD-1和FSDD-2出现了红移和较高的ε，这表明DB染料具有更好的光收集能力。与SB染料FSSD-EH相比，由DB染料FSDD-1和FSDD-2敏化的染料敏化太阳能电池（DSSC）的J _sc和V _oc显着增加，因此η更好可以通过DB染料实现（FSDD-1，FSDD-2和FSSD-EH分别为5.34、7.14和2.46％）。与带有yne单元作为隔离基团的FSDD-1相比，带有diyne单元的FSDD-2表现出更高的η。研究表明，通过采用炔键作为隔离基团将两个染料分子连接为DB染料，可以实现DSSC更好的光伏性能。由二炔单元实现的两个分支之间更长的距离对于实现更好的光伏性能是有益和有效的。

更新日期：2021-01-07

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