用于非富勒烯有机太阳能电池的基于茚并二噻吩并[3,2-b:2',3'-d]噻吩的宽带隙D-π-A共聚物
Indacenodithieno[3,2-]thiophene-Based Wide Bandgap D-π-A Copolymer for Nonfullerene Organic Solar Cells.
作者信息
Li Feng, Tang Ailing, Zhang Bao, Zhou Erjun
机构信息
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
ACS Macro Lett. 2019 Dec 17;8(12):1599-1604. doi: 10.1021/acsmacrolett.9b00704. Epub 2019 Nov 22.
Herein, a wide-bandgap (2.02 eV) donor-π-acceptor (D-π-A) polymer PIDTT-DTffBTA, composed of a rigid indacenodithieno[3,2-]thiophene (IDTT) and fluorinated benzo[][1,2,3]triazole (ffBTA) units as D and A units, respectively, is synthesized. In comparison with its analogue benzodithiophene--benzotriazole copolymer J52 with classic benzodithiophene (BDT) as the D unit, PIDTT-DTffBTA demonstrates a lower-lying HOMO energy level and higher carrier mobilities when paired with a nonfullerene acceptor (NFA) Y6 based on a ladder-type dithienothiophen[3.2-]-pyrrolobenzothiadiazole central unit. Thus, PIDTT-DTffBTA:Y6 based organic solar cells (OSCs) exhibit an improved power conversion efficiency (PCE) of 11.05% than that of J52:Y6 (7.15%), which is also the highest value for IDTT-based photovoltaic polymers. This result proves that the IDTT unit is also a promising building block to construct not only NFAs but also p-type photovoltaic polymers.
在此，合成了一种宽带隙（2.02 eV）的供体-π-受体（D-π-A）聚合物PIDTT-DTffBTA，它由刚性的茚并二噻吩并[3,2-b]噻吩（IDTT）和氟化苯并[c][1,2,3]三唑（ffBTA）单元分别作为供体和受体单元组成。与以经典苯并二噻吩（BDT）作为供体单元的类似物苯并二噻吩-苯并三唑共聚物J52相比，当与基于梯型二噻吩并噻吩[3.2-b] - 吡咯并苯并噻二唑中心单元的非富勒烯受体（NFA）Y6配对时，PIDTT-DTffBTA表现出较低的最高占据分子轨道（HOMO）能级和更高的载流子迁移率。因此，基于PIDTT-DTffBTA:Y6的有机太阳能电池（OSC）的功率转换效率（PCE）为11.05%，高于J52:Y6（7.15%），这也是基于IDTT的光伏聚合物的最高值。该结果证明，IDTT单元不仅是构建非富勒烯受体，也是构建p型光伏聚合物的有前景的结构单元。
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