有机太阳能电池
噻吩
接受者
材料科学
三元运算
罗丹宁
太阳能电池
带隙
能量转换效率
光电子学
光化学
化学
有机化学
聚合物
物理
凝聚态物理
复合材料
程序设计语言
计算机科学
作者
María Privado,Prateek Malhotra,Pilar de la Cruz,Rahul Singhal,Jesús Cerdá,Juan Aragó,Enrique Ortı́,Ganesh D. Sharma,Fernando Langa
出处
期刊:Solar RRL
[Wiley]
日期:2020-01-15
卷期号:4 (4)
被引量:21
标识
DOI:10.1002/solr.201900471
摘要
A new near‐IR absorbing nonfullerene acceptor (NFA), MPU4, is synthesized in three steps from an accessible selenophene–diketopyrrolopyrrole and rhodanine. The high planarity of the molecule and the extended conjugation determine that the new NFA presents a high optical absorption coefficient and a narrow bandgap. In thin films, MPU4 shows broad absorption in the visible and near‐IR regions from 550 to 930 nm. When blended with a phenothiazine‐based small‐molecule (SM) donor, SM1, the resulting additive‐free binary organic solar cell (OSC) exhibits an efficiency of 8.96% with a high open‐circuit voltage ( V oc ) of 0.99 V and a short‐circuit current ( J sc ) of 14.91 mA cm −2 with a remarkably low energy loss ( E loss ) of 0.42 eV. This efficiency is significantly higher (24%) than that achieved with an analogous device with a thiophene‐containing NFA (MPU1, 7.22%) instead of MPU4. Importantly, ternary solar cells prepared with SM1 as the donor and MPU4 and PC 71 BM as acceptors afford, after solvent vapor annealing, an efficiency of 10.04% with a V oc of 0.92 V, J sc of 16.32 mA cm −2 , fill factor of 0.67, and E loss of 0.49 eV. These results demonstrate the advantages of using selenophene instead of thiophene in SM OSCs.
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