Dithieno[3,2-b:2′,3′-d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells
Dithieno[3,2-b:2′,3′-d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells
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DOI：
10.1002/adma.201707150
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发表时间：
2018-04-19
影响因子：
29.4
通讯作者：
Tang, Weihua
中科院分区：
文献类型：
--
作者：
Sun, Jia;Ma, Xiaoling;Tang, Weihua
设计并合成了一种新的富电子中心结构单元5，5，12，12-四（4-己基苯基）-引达省双-（二噻吩并[3，2-B：2 '，3'-d]吡咯）（INP）和两种衍生的非富勒烯受体（INPIC和INPIC-4F）。由于INP良好的给电子能力，这两个分子显示出宽（600-900 nm）和强吸收。与相应的INPIC相比，氟化非富勒烯受体INPIC-4F具有更强的近红外吸收和更窄的光学带隙（1.39 eV），更好的结晶性和更高的电子迁移率，以及下移的最高占据分子轨道和最低未占据分子轨道能级。基于INPIC-4F的有机太阳能电池（OSC）表现出13.13%的高功率转换效率（PCE）和0.54 eV的相对低的能量损失，这是文献中报道的二元OSC的最高效率之一。结果表明，新的INP作为一个给电子的积木构建高性能的非富勒烯受体的OSC的巨大潜力。
A new electron-rich central building block, 5,5,12,12-tetrakis(4-hexylphenyl)-indacenobis-(dithieno[3,2-b:2',3'-d]pyrrol) (INP), and two derivative nonfullerene acceptors (INPIC and INPIC-4F) are designed and synthesized. The two molecules reveal broad (600-900 nm) and strong absorption due to the satisfactory electron-donating ability of INP. Compared with its counterpart INPIC, fluorinated nonfullerene acceptor INPIC-4F exhibits a stronger near-infrared absorption with a narrower optical bandgap of 1.39 eV, an improved crystallinity with higher electron mobility, and down-shifted highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. Organic solar cells (OSCs) based on INPIC-4F exhibit a high power conversion efficiency (PCE) of 13.13% and a relatively low energy loss of 0.54 eV, which is among the highest efficiencies reported for binary OSCs in the literature. The results demonstrate the great potential of the new INP as an electron-donating building block for constructing high-performance nonfullerene acceptors for OSCs.