Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells
2017
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
(2.2 ´ 10 –3 cm 2 V –1 s –1 ) than IDT-2BR
(3.4 ´ 10 –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.
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