Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells
Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells
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DOI：
10.1007/s11426-016-0336-6
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发表时间：
2017-02-01
影响因子：
9.6
通讯作者：
Zhan, Xiaowei
中科院分区：
文献类型：
--
作者：
Jia, Boyu;Wu, Yao;Zhan, Xiaowei
设计并合成了一种以吲哚二硫吩环为核，侧链为己基侧基苯并噻二唑罗丹宁的稠环电子受体IDT-2Br1。与具有己基苯基侧链的化合物(IDT-2BR)相比，IDT-2BR1具有更高的最高占据分子轨道(HOMO)能量和相似的最低空分子轨道(LUMO)能量(IDT-2BR1：HOMO=-5.37 eV，LUMO=-3.67 eV；IDT-2BR：HOMO=-5.52 eV，LUMO=-3.69 eV)，吸收红移，禁带宽度较窄。IDT-2Br1的电子迁移率(2.2×10~(-3)cm(-3)cm(2)V~(-1)S(-1))比IDT-2Br1(3.4×10~(-4)cm(-4)V~(-1)S(~(-1)高，这是由于空间位阻减小和分子有序堆积所致。基于PtB7-Th：IDT-2Br1的无富勒烯有机太阳能电池的功率转换效率高达8.7%，高于PtB7-Th：IDT-2Br(7.7%)，开路电压高达0.95V，器件稳定性好。
A fused-ring electron acceptor IDT-2BR1 based on indacenodithiophene core with hexyl side-chains flanked by benzothiadiazole rhodanine was designed and synthesized. In comparison with its counterpart with hexylphenyl side-chains (IDT-2BR), IDT-2BR1 exhibits higher highest occupied molecular orbital (HOMO) energy but similar lowest unoccupied molecular orbital (LUMO) energy (IDT-2BR1: HOMO=-5.37 eV, LUMO=-3.67 eV; IDT-2BR: HOMO=-5.52 eV, LUMO=-3.69 eV), red-shifted absorption and narrower bandgap. IDT-2BR1 has higher electron mobility (2.2x10(-3) cm(2) V-1 s(-1)) than IDT-2BR (3.4x10(-4) cm(2) V-1 s(-1)) due to the reduced steric hindrance and ordered molecular packing. Fullerene-free organic solar cells based on PTB7-Th:IDT-2BR1 yield power conversion efficiencies up to 8.7%, higher than that of PTB7-Th:IDT-2BR (7.7%), with a high open circuit voltage of 0.95 V and good device stability.