基于七元环苯并二噻吩并环戊二烯单元的小分子受体用于高效的非富勒烯有机太阳能电池。
Small-Molecule Acceptor Based on the Heptacyclic Benzodi(cyclopentadithiophene) Unit for Highly Efficient Nonfullerene Organic Solar Cells.
机构信息
The Key Laboratory of Functional Polymer Materials and State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China.
School of Materials Science and Engineering, The National Institute for Advanced Materials, Nankai University , Tianjin 300071, China.
出版信息
J Am Chem Soc. 2017 Apr 5;139(13):4929-4934. doi: 10.1021/jacs.7b01170. Epub 2017 Mar 24.
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 PBDB-T:NFBDT-based device with an outstanding short-circuit current density of 17.85 mA cm under AM 1.5G irradiation (100 mW cm), 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.
一种新型的非富勒烯小分子受体-给体-受体（A-D-A）结构，即 NFBDT，基于一个七元环苯并二（环戊二噻吩）（FBDT）单元，使用苯并[1,2-b:4,5-b']二噻吩作为核心单元，被设计和合成。对其吸收能力、能级、热稳定性以及光伏性能进行了充分的研究。NFBDT 具有低的光学带隙 1.56 eV，导致了广泛而有效的吸收，覆盖了 600 到 800nm 的范围，以及合适的能级作为电子受体。与广泛使用和成功的宽带隙聚合物 PBDB-T 作为电子给体材料相结合，在 AM 1.5G 照射下（100 mW cm），基于 PBDB-T:NFBDT 的器件获得了优化的 PCE 为 10.42%，具有出色的短路电流密度 17.85 mA cm，这是迄今为止 NF-OSC 器件的最高性能之一。这些结果表明，BDT 单元也可用于设计 NF 受体，而稠环苯并二（环戊二噻吩）单元是设计具有优异性能的新型 NF 受体的有前途的砌块。
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