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Crystalline Medium-Bandgap Light-Harvesting Donor Material Based on β-Naphthalene Asymmetric-Modified Benzodithiophene Moiety toward Efficient Polymer Solar Cells
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acs.chemmater.7b02495 Yonghai Li 1 , Deyu Liu 1, 2 , Junyi Wang 1, 2 , Zhi-Guo Zhang 3 , Yongfang Li 3 , Yanfang Liu 1 , Tingting Zhu 4 , Xichang Bao 1 , Mingliang Sun 4 , Renqiang Yang 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acs.chemmater.7b02495 Yonghai Li 1 , Deyu Liu 1, 2 , Junyi Wang 1, 2 , Zhi-Guo Zhang 3 , Yongfang Li 3 , Yanfang Liu 1 , Tingting Zhu 4 , Xichang Bao 1 , Mingliang Sun 4 , Renqiang Yang 1
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In this paper, we reported a crystalline p-type medium-bandgap conjugated D–A polymer asy-PBDBTN based on a symmetry-breaking-modified BDT moiety to combine the advantages of both one-dimension (1D) and two-dimension (2D) symmetric BDTs. Polymer asy-PBDBTN is a highly efficient light-harvesting donor material. Single BHJ PSCs exhibit PCE of 8.88% with PC71BM as acceptor. Also, PCE values of 10.50% are achieved with the use of ITIC as an acceptor to couple asy-PBDBTN with VOC of 0.942 V, JSC of 16.81 mA cm–2, and FF of 0.663. It is worth noting that lower energy loss is obtained in fullerene-free-based PSCs, which is essential to overcome the trade-off between VOC and JSC and boost these two parameters simultaneously for high photovoltaic performance. The combination process of additive and thermal annealing is critical to enhance and retain the π–π stacking behavior of donor and fullerene-free acceptor; as a result, the trap-assisted recombination was greatly suppressed. This work demonstrates a great prospect for the construction of the symmetry-breaking BDT-based D–A conjugated polymers toward high-performance PSCs, especially with fullerene-free acceptor material.
中文翻译：
基于β-萘不对称修饰的苯并二噻吩部分的结晶型中带隙光收集供体材料，用于高效聚合物太阳能电池
在本文中，我们报道了结晶的p型介质带隙偶联d-A聚合物ASY基于一个对称破裂改性BDT部分到两个一维（1D）和二维的优点结合起来-PBDBTN（2D ）对称的BDT。聚合物ASY -PBDBTN是一种高效的捕光供体材料。单个BHJ PSC的PCE值为8.88％，其中PC 71 BM为受体。而且，10.50％PCE值与使用ITIC的作为受体耦合实现ASY -PBDBTN与V OC 0.942的V，Ĵ SC的16.81毫安厘米-2和FF为0.663。值得注意的是，在不含富勒烯的PSC中获得了更低的能量损耗，这对于克服V OC和J SC之间的折衷以及同时提高这两个参数以实现高光伏性能至关重要。添加剂和热退火的组合过程对于增强和保持供体和无富勒烯受体的π–π堆积行为至关重要；结果，极大地抑制了陷阱辅助的重组。这项工作展示了针对高性能PSC尤其是使用不含富勒烯的受体材料，构建破坏对称性的基于BDT的D–A共轭聚合物的广阔前景。
更新日期：2017-09-20
中文翻译：
基于β-萘不对称修饰的苯并二噻吩部分的结晶型中带隙光收集供体材料，用于高效聚合物太阳能电池
在本文中，我们报道了结晶的p型介质带隙偶联d-A聚合物ASY基于一个对称破裂改性BDT部分到两个一维（1D）和二维的优点结合起来-PBDBTN（2D ）对称的BDT。聚合物ASY -PBDBTN是一种高效的捕光供体材料。单个BHJ PSC的PCE值为8.88％，其中PC 71 BM为受体。而且，10.50％PCE值与使用ITIC的作为受体耦合实现ASY -PBDBTN与V OC 0.942的V，Ĵ SC的16.81毫安厘米-2和FF为0.663。值得注意的是，在不含富勒烯的PSC中获得了更低的能量损耗，这对于克服V OC和J SC之间的折衷以及同时提高这两个参数以实现高光伏性能至关重要。添加剂和热退火的组合过程对于增强和保持供体和无富勒烯受体的π–π堆积行为至关重要；结果，极大地抑制了陷阱辅助的重组。这项工作展示了针对高性能PSC尤其是使用不含富勒烯的受体材料，构建破坏对称性的基于BDT的D–A共轭聚合物的广阔前景。
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