Ring Fusion of Thiophene-Vinylene-Thiophene (TVT) Benefits Both Fullerene and Non-Fullerene Polymer Solar Cells
Ring Fusion of Thiophene-Vinylene-Thiophene (TVT) Benefits Both Fullerene and Non-Fullerene Polymer Solar Cells
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噻吩-亚乙烯基-噻吩 (TVT) 的环稠合有利于富勒烯和非富勒烯聚合物太阳能电池
DOI：
10.1021/acs.macromol.8b00805
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发表时间：
2018
期刊：
影响因子：
5.5
通讯作者：
Zhou Erjun
中科院分区：
文献类型：
--
作者：
Wang Xiaochen;Tang Ailing;Chen Fan;Zhou Erjun
设计合成了噻吩-乙烯基噻吩（TVT）和乙烯熔融TVT （ETVT）与烷基化二噻基苯并噻吩二唑（DTBT）结合的共轭聚合物，研究了环熔融对TVT基光伏聚合物性能的影响。发现TVT段的环状融合对聚合物的分子结构和光电性能有显著影响。环融合可以降低HOMO能级，提高相应聚合物的吸收系数。结合降低的能量损失，PETVTTBT在富勒烯和非富勒烯聚合物太阳能电池中都表现出优于PTVTTBT的光伏性能。特别是，在基于ITIC的聚合物太阳能电池中，在环融合后，jsc，VOC和FF同时增强。因此，PETVTTBT基太阳能电池的PCE比PTVTTBT（3.69%）大幅提高了120%，达到8.18%。
Conjugated polymers based on thiophene–vinylene–thiophene (TVT) and ethenylene fused TVT (ETVT) combined with alkylated dithienylbenzothiadiazole (DTBT) were designed and synthesized to investigate the effect of ring fusion on the properties of TVT based photovoltaic polymers. It is found that ring fusion of the TVT segment significantly affects molecular architecture and optoelectronic properties of the polymer. Ring fusion can downshift the HOMO energy level and increase the absorption coefficient of the corresponding polymer. Combining with reduced energy loss, PETVTTBT shows superior photovoltaic performance to PTVTTBT, in both fullerene and non-fullerene polymer solar cells. Particularly, in ITIC based polymer solar cells, simultaneous enhancement in theJSC,VOC, and FF is demonstrated after ring fusion. As a result, PCE of PETVTTBT based solar cells increases drastically by 120% over that of PTVTTBT (3.69%), reaching 8.18%.