A two‐dimensional electron‐rich fused‐ring moiety (ClBDSe) based on benzo[1,2‐b:4,5‐b′]diselenophene is synthesized. Three copolymers (PBDT−Se, PBDSe−T, and PBDSe−Se) are obtained by manipulating the connection types and number of se...
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https://www.riss.kr/link?id=O112774706
2021년
-
1864-5631
1864-564X
SCOPUS;SCIE
학술저널
4454-4465 [※수록면이 p5 이하이면, Review, Columns, Editor's Note, Abstract 등일 경우가 있습니다.]
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
A two‐dimensional electron‐rich fused‐ring moiety (ClBDSe) based on benzo[1,2‐b:4,5‐b′]diselenophene is synthesized. Three copolymers (PBDT−Se, PBDSe−T, and PBDSe−Se) are obtained by manipulating the connection types and number of se...
A two‐dimensional electron‐rich fused‐ring moiety (ClBDSe) based on benzo[1,2‐b:4,5‐b′]diselenophene is synthesized. Three copolymers (PBDT−Se, PBDSe−T, and PBDSe−Se) are obtained by manipulating the connection types and number of selenophene units on the conjugated main chains with two 2D fused‐ring units and two different π‐bridges, respectively. In comparison with PBDT−Se and PBDSe−Se, PBDSe−T with benzo[1,2‐b:4,5‐b′]diselenophene unit and thiophene π‐bridge exhibits the deepest HOMO energy level and the strongest crystallinity in neat films. The PBDSe−T:Y6 blend film exhibits the best absorption complementarity, the most distinctive face‐on orientation with proper phase separation, the highest carrier mobilities, and the lowest charge recombination among three blend films. Finally, the PBDSe−T:Y6‐based device delivers an impressive power conversion efficiency (PCE) of 14.50 %, which is higher than those of PBDT−Se:Y6 and PBDSe−Se:Y6. Moreover, a decent open‐circuit voltage (Voc) of 0.89 V with a remarkably small energy loss of 0.44 eV is achieved for PBDSe−T:Y6. The efficiency of 14.50 % is the highest value for selenophene‐containing copolymer‐based binary organic solar cells (OSCs). This study provides evidence that introduction of 2D‐benzo[1,2‐b:4,5‐b′]diselenophene as a fused electron‐rich unit with π‐bridging into copolymeric donors is a valid strategy for providing high Voc and excellent PCE simultaneously in selenophene‐based OSCs.
Introduction of two‐dimensional conjugated benzo[1,2‐b:4,5‐b′]diselenophene as a fused electron‐rich unit with π‐bridging connections into copolymeric donors is an effective strategy for providing high open‐circuit voltage and excellent power conversion efficiency (PCE) simultaneously in selenophene‐based organic solar cells (OSCs). The optimum PCE of 14.50 % is the highest value for selenophene‐containing copolymer‐based binary OSCs.