Small-Molecule Acceptor Based on the Heptacyclic Benzodi(cyclopentadithiophene) Unit for Highly Efficient Nonfullerene Organic Solar Cells
Small-Molecule Acceptor Based on the Heptacyclic Benzodi(cyclopentadithiophene) Unit for Highly Efficient Nonfullerene Organic Solar Cells
复制标题
用于高效非富勒烯有机太阳能电池的基于七环苯并二（环戊二噻吩）单元的小分子受体
DOI：
10.1021/jacs.7b01170
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发表时间：
2017-04-05
影响因子：
15
通讯作者：
Chen, Yongsheng
中科院分区：
文献类型：
--
作者：
Kan, Bin;Feng, Huanran;Chen, Yongsheng
设计并合成了一种以苯并[1，2-B：4，5-b ']-二噻吩为核心单元的七环苯并二（环戊二烯基噻吩）（FBDT）结构单元，具有受体-供体-受体（A-D-A）结构的非富勒烯小分子NFBDT.对其吸收能力、能级、热稳定性以及光伏性能进行了全面的研究。NFBDT表现出1.56 eV的低光学带隙，导致覆盖600至800 nm范围的宽且有效的吸收，以及作为电子受体的合适能级。在选择广泛使用且成功的宽带隙聚合物PBDB-T作为电子供体材料的情况下，基于PBDBT：NFBDT的器件获得了10.42%的优化PCE，在AM 1.5G照射（100 mW cm（2））下具有17.85 mA cm（2）的出色短路电流密度，这是迄今为止NF-OSC器件的最高性能之一。这些结果表明，BDT单元也可以应用于NF受体的设计，稠环苯并二（环戊二烯基噻吩）单元是一个有前途的块，设计新的NF受体具有优异的性能。
A new nonfullerene small molecule with acceptor donor acceptor (A-D-A) structure, namely, NFBDT, based on a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit using benzo[1,2-b:4,5-b']-dithiophene as the core unit, was designed and synthesized. Its absorption ability, energy levels, thermal stability, as well as photovoltaic performances were fully investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption that covered the range from 600 to 800 nm, and suitable energy levels as an electron acceptor. With the widely used and successful wide bandgap polymer PBDB-T selected as the electron donor material, an optimized PCE of 10.42% was obtained for the PBDBT:NFBDT-based device with an outstanding short-circuit current density of 17.85 mA cm(2) under AM 1.5G irradiation (100 mW cm(2)), which is so far among the highest performance of NF-OSC devices. These results demonstrate that the BDT unit could also be applied for designing NF acceptors, and the fused-ring benzodi(cyclopentadithiophene) unit is a prospective block for designing new NF-acceptors with excellent performance.