Two Well-Miscible Acceptors Work as One for Efficient Fullerene-Free Organic Solar Cells
Two Well-Miscible Acceptors Work as One for Efficient Fullerene-Free Organic Solar Cells
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两种易混溶的受体合二为一，用于高效无富勒烯有机太阳能电池
DOI：
10.1002/adma.201700437
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发表时间：
2017-07-12
影响因子：
29.4
通讯作者：
Hou, Jianhui
中科院分区：
文献类型：
--
作者：
Yu, Runnan;Zhang, Shaoqing;Hou, Jianhui
高性能三元有机太阳能电池是由宽带隙聚合物供体（二噻吩-苯并二噻吩-氟苯并三唑共聚物，J52）和两个良好混溶的非富勒烯受体，甲基修饰的非富勒烯受体（IT-M）和2,2'-((2Z, 2' Z)-((5,5'-(4,4,9,9-四烷基-（4-己基苯基）-4,9-二氢茚二烯[1,2-b]；5,6-b']二噻吩2,7-二基)二（4-（（2-乙基己基）氧）噻吩-5,2-二基）二（甲基亚基）二（3-氧-2,3-二氢- 1h -茚-2,1-二亚基）)二丙二腈（IEICO）。具有互补吸收光谱和相似的最低未占据分子轨道水平的两个受体由于其非常相似的化学结构而在共混物中表现出良好的相容性。所得三元有机太阳能电池（OSC）效率高达11.1%，短路电流密度为19.7 mA cm(-2)，填充系数为0.668。在该三元体系中，同时实现了扩宽吸收、相似输出电压和兼容形态，显示了进一步提高三元osc性能的有希望的策略。
High-performance ternary organic solar cells are fabricated by using a widebandgap polymer donor (bithienyl-benzodithiophene-alt-fluorobenzotriazole copolymer, J52) and two well-miscible nonfullerene acceptors, methyl-modified nonfullerene acceptor (IT-M) and 2,2'-((2Z, 2' Z)-((5,5'-(4,4,9,9-tetrakis-(4-hexylphenyl)-4,9-dihydros-indaceno[1,2-b: 5,6-b'] dithiophene2,7-diyl) bis(4-((2-ethylhexyl) oxy)thiophene-5,2-diyl))bis(methanylylidene)) bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IEICO). The two acceptors with complementary absorption spectra and similar lowest unoccupied molecular orbital levels show excellent compatibility in the blend due to their very similar chemical structures. Consequently, the obtained ternary organic solar cells (OSC) exhibits a high efficiency of 11.1%, with an enhanced short-circuit current density of 19.7 mA cm(-2) and a fill factor of 0.668. In this ternary system, broadened absorption, similar output voltages, and compatible morphology are achieved simultaneously, demonstrating a promising strategy to further improve the performance of ternary OSCs.