Scientific Reports ( IF 3.8 ) Pub Date : 2019-08-19 , DOI: 10.1038/s41598-019-48306-x
Hyeongjin Hwang 1 , Dong Hun Sin 1 , Chaneui Park 1 , Kilwon Cho 1
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A low-bandgap acceptor (ITIC) was added to a binary system composed of a wide-bandgap polymer (PBT-OTT) and an acceptor (PC71BM) to increase the light harvesting efficiency of the associated organic solar cells (OSCs). A ternary blend OSC with an acceptor ratio of PC71BM:ITIC = 8:2 was found to exhibit a power conversion efficiency of 8.18%, which is 18% higher than that of the binary OSC without ITIC. This improvement is mainly due to the enhanced light absorption and optimized film morphology that result from ITIC addition. Furthermore, an energy level cascade forms in the blend that ensures efficient charge transfer, and bimolecular and trap-assisted recombination is suppressed. Thus the use of ternary blend systems provides an effective strategy for the development of efficient single-junction OSCs.
中文翻译:
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基于宽带隙聚合物的三元有机太阳能电池,具有增强的功率转换效率。
将低带隙受体(ITIC)添加到由宽带隙聚合物(PBT-OTT)和受体(PC 71 BM)组成的二元系统中,以提高相关有机太阳能电池(OSC)的光收集效率。受体比为PC 71的三元混合OSC发现BM:ITIC = 8:2的功率转换效率为8.18%,比不带ITIC的二进制OSC的功率转换效率高18%。这种改进主要归因于ITIC的添加,增强了光吸收并优化了膜的形态。此外,在共混物中形成能级级联,以确保有效的电荷转移,并抑制了双分子和陷阱辅助的重组。因此,三元混合系统的使用为开发有效的单结OSC提供了有效的策略。