TY - JOUR
T1 - Organic solar cells based on chlorine functionalized benzo[1,2-b:4,5-b′]difuran-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione copolymer with efficiency exceeding 13%
AU - Ye, Linglong
AU - Li, Xueshan
AU - Cai, Yunhao
AU - Ryu, Hwa Sook
AU - Lu, Guangkai
AU - Wei, Donghui
AU - Sun, Xiaobo
AU - Woo, Han Young
AU - Tan, Songting
AU - Sun, Yanming
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (21674007, 51825301, 21975012, 21875204, 21875204, 21734001). HYW is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2019R1A2C2085290, 2019R1A6A1A11044070).
Funding Information:
This work was supported by the National Natural Science Foundation of China (21674007, 51825301, 21975012, 21875204, 21875204, 21734001). HYW is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2019R1A2C2085290, 2019R1A6A1A11044070).
Publisher Copyright:
© 2020, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Benzo[1,2-b:4,5-b′]dithiophene (BDT) has been widely used to construct donor-acceptor (D-A) copolymers in organic solar cells (OSCs). However, benzo[1,2-b:4,5-b′]difuran (BDF), an analogue of BDT, has received less attention than BDT. The photovoltaic performance of BDF copolymers has lagged behind that of BDT copolymers. Here, we designed and synthesized two BDF copolymers, PBF1-C and PBF1-C-2Cl. PBF1-C-2Cl, which is composed of BDF and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione connected by a chlorinated thiophene π-bridge, displays a low-lying highest occupied molecular orbital energy level, which helps in yielding a high open-circuit voltage (Voc) in OSCs. As a result, when blended with Y6, PBF1-C-2Cl-based devices showed a high Voc of 0.83 V and a power conversion efficiency (PCE) of 13.10%. To the best of our knowledge, the PCE of 13.10% is among the highest efficiency values for OSCs based on BDF copolymers.
AB - Benzo[1,2-b:4,5-b′]dithiophene (BDT) has been widely used to construct donor-acceptor (D-A) copolymers in organic solar cells (OSCs). However, benzo[1,2-b:4,5-b′]difuran (BDF), an analogue of BDT, has received less attention than BDT. The photovoltaic performance of BDF copolymers has lagged behind that of BDT copolymers. Here, we designed and synthesized two BDF copolymers, PBF1-C and PBF1-C-2Cl. PBF1-C-2Cl, which is composed of BDF and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione connected by a chlorinated thiophene π-bridge, displays a low-lying highest occupied molecular orbital energy level, which helps in yielding a high open-circuit voltage (Voc) in OSCs. As a result, when blended with Y6, PBF1-C-2Cl-based devices showed a high Voc of 0.83 V and a power conversion efficiency (PCE) of 13.10%. To the best of our knowledge, the PCE of 13.10% is among the highest efficiency values for OSCs based on BDF copolymers.
KW - benzo[1, 2-b:4, 5-b′]difuran
KW - benzo[1, 2-c:4, 5-c′]dithiophene-4, 8-dione
KW - chlorinated thiophene
KW - organic solar cells
KW - π-bridge
UR - http://www.scopus.com/inward/record.url?scp=85082135045&partnerID=8YFLogxK
U2 - 10.1007/s11426-019-9684-8
DO - 10.1007/s11426-019-9684-8
M3 - Article
AN - SCOPUS:85082135045
SN - 1674-7291
VL - 63
SP - 483
EP - 489
JO - Science China Chemistry
JF - Science China Chemistry
IS - 4
ER -
