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Two‐Dimension Conjugated Acceptors Based on Benzodi(cyclopentadithiophene) Core with Thiophene‐Fused Ending Group for Efficient Polymer Solar Cells
Solar RRL ( IF 7.9 ) Pub Date : 2020-03-11 , DOI: 10.1002/solr.202000071
Youdi Zhang 1, 2 , Yongjoon Cho 3 , Lian Zhong 4 , Ying Wang 1 , Bin Huang 1 , Zhongyi Yuan 1, 2 , Changduk Yang 3 , Yiwang Chen 1, 2, 5 , Yongfang Li 4
Affiliation  

The previously reported nonfullerene small molecule ITIC‐SF achieved via side chain tuning, promotes the power conversion efficiency of polymer solar cells (PSCs) with PBDB‐T‐SF as the donor from 10.1% and ITIC2 acceptors up to 12.2% for ITIC‐SF acceptors. To further this research, benzene end groups of molecules are herein substituted with thiophene rings, obtaining two new molecules BDTCH‐IC with alkylthio substituents, and BDTSF‐IC with alkylthio and fluorine substituents on their thiophene‐conjugated side chains. The absorption edges of BDTCH‐IC and BDTSF‐IC are red‐shifted to 824 and 793 nm, respectively. Strengthened molecular crystallinity, promoted charge extraction, and upgraded morphology endorse the advancement of photovoltaic performance of the small molecular acceptors. Using donor PM6, the two small molecule acceptors show good photovoltaic performance, although the highest occupied molecular orbit energy offsets are small between donor and acceptor materials. As a combination of side‐chain and end‐group engineering, the photovoltaic performance of the PSCs is increased to 13.1%, together with the best short‐circuit current (JSC) and fill factor reported thus far for this series of molecules. The results indicate that the modification of side chain and end groups is an effective way to improve the photovoltaic performance of small molecule acceptors.

中文翻译:

基于苯并二(环戊二噻吩)核与噻吩融合端基的二维共轭受体,用于高效聚合物太阳能电池

先前报道的通过侧链调节实现的非富勒烯小分子ITIC-SF,提高了以PBDB-T-SF为供体的聚合物太阳能电池(PSC)的功率转换效率,从ITI-SF的10.1%和ITIC2受体提高到12.2%接受者。为了进一步进行这项研究,本文将分子的苯端基取代为噻吩环,从而在噻吩共轭的侧链上获得两个具有烷硫基取代基的新分子BDTCH-IC和具有烷硫基和氟取代基的BDTSF-IC。BDTCH-IC和BDTSF-IC的吸收边缘分别红移到824和793 nm。增强分子结晶度,促进电荷提取,并改善形貌,这证明了小分子受体光伏性能的提高。使用捐赠者PM6,这两个小分子受体显示出良好的光伏性能,尽管在供体和受体材料之间占据最高分子轨道的能量偏移很小。通过侧链和端组工程的结合,PSC的光伏性能提高到13.1%,同时具有最佳的短路电流(迄今已报道了该系列分子的J SC和填充因子。结果表明,侧链和端基的修饰是提高小分子受体光伏性能的有效途径。
更新日期:2020-03-11
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