Journal
ACS MACRO LETTERS
Volume 8, Issue 12, Pages 1599-1604Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.9b00704
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Funding
- National Key Research and Development Program of China [2017YFA0206600]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SLH033]
- National Natural Science Foundation of China (NSFC) [51673048, 21875052, 21602040, 51873044]
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Herein, a wide-bandgap (2.02 eV) donor-pi-acceptor (D-pi-A) polymer PIDTT-DTffBTA, composed of a rigid indacenodithieno[3,2-b]thiophene (IDTT) and fluorinated benzo[d][1,2,3]triazole (ffBTA) units as D and A units, respectively, is synthesized. In comparison with its analogue benzodithiophene-alt-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-b]-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.
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