首页> 外文期刊>Dyes and Pigments >Metal-free organic dyes with di(1-benzothieno)[3,2-b:2 ',3 '-d]pyrrole as an auxiliary donor for efficient dye-sensitized solar cells: Effect of the molecular engineering on the photovoltaic performance
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Metal-free organic dyes with di(1-benzothieno)[3,2-b:2 ',3 '-d]pyrrole as an auxiliary donor for efficient dye-sensitized solar cells: Effect of the molecular engineering on the photovoltaic performance

机译:具有DI(1-苯并噻吩)的无金属有机染料[3,2-B:2',3'-D]吡咯作为辅助供体,用于高效染料敏化太阳能电池:分子工程对光伏性能的影响

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摘要

A series of novel di(1-benzothieno)[3,2-b:2',3'-d]pyrrole (DBTP)-based organic dyes (WL5-10) with D-D-pi-A or D-D-A-pi-A configurations are designed and the relationship between the properties and molecular configurations of these organic dyes are studied systematically. WL5,7-8 with D-D-pi-A configuration incorporating triphenylamine or phenothiazine as donor and DBTP as auxiliary donor and WL9-10 with D-D-A-pi-A configuration incorporating benzothiadiazole as an auxiliary acceptor are synthesized to study the effect of the molecular engineering on the photovoltaic performance. WL5,7-8 exhibit similar absorption spectra and high molar extinction coefficient. Especially, the dye WL5 with phenothiazine as terminal donor displays a high PCE of 6.75%, which is much higher than that of the dye WL1a with D-pi-A configuration. WL9-10 show the weakest performance, which is attributed to electron trap and mismatch of energy-level due to the strongest electron withdrawing group benzothiadiazole. Finally, a high power conversion efficiency of 7.94% with chenodeoxycholic acid as the co-absorbent for the DSSC based on WL5 is achieved. The results indicate that the molecular engineering of the dyes affects the photovoltaic performance greatly, and the DBTP-based organic dye with D-D-pi-A configuration by incorporating an extra terminal donor might be an effective approach to enhance the photovoltaic performance.
机译:一系列新型DI(1-苯并噻吩)[3,2-B:2',3'-D]吡咯(DBTP)基于有机染料(WL5-10),具有DD-PI-A或DDA-PI-A.设计了配置,系统地研究了这些有机染料的性质和分子配置之间的关系。 WL5,7-8具有DD-PI-A的构型,其作为供体和DBTP作为辅助供体和DDA-PI-A的WL9-10,合成了作为辅助受体的DDA-PI-A构型,以研究分子工程的效果关于光伏性能。 WL5,7-8表现出类似的吸收光谱和高摩尔消光系数。特别是,用吩噻嗪作为终端供体的染料WL5显示出6.75%的高PCE,其高于染料WL1a的染料WL1a的构型。 WL9-10表现出最弱的性能,这归因于电子捕集器和由于最强的吸电子群苯并噻唑,所以能量水平不匹配。最后,达到了基于WL5的DSSC的共吸收剂的低功率转化效率为7.94%。结果表明,染料的分子工程大大影响了光伏性能,并且通过结合额外的终端供体具有D-D-PI-A构造的DBTP的有机染料可能是增强光伏性能的有效方法。

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