TY - JOUR
T1 - Simultaneously improving the photovoltaic parameters of organic solar cellsviaisomerization of benzo[b]benzo[4,5]thieno[2,3-d]thiophene-based octacyclic non-fullerene acceptors
AU - Zhou, Zhijie
AU - Duan, Jiamin
AU - Ye, Linglong
AU - Wang, Guo
AU - Zhao, Bin
AU - Tan, Songting
AU - Shen, Ping
AU - Ryu, Hwa Sook
AU - Woo, Han Young
AU - Sun, Yanming
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 21875204 and 51873177), and HYW is grateful for the nancial support from the National Research Foundation (NRF) of Korea (2012M3A6A7055540 and 2015M1A2A2057506).
Publisher Copyright:
© The Royal Society of Chemistry 2020.
PY - 2020/5/21
Y1 - 2020/5/21
N2 - Fused-ring electron acceptors (FREAs) have attracted immense interest owing to their ability for facile structural modification and good thermal and optical characteristics. Among these acceptors, isomerized building blocks originating from multiple reaction sites affect the electronic structures, morphological properties and resulting photovoltaic performance, but have rarely been studied. Herein, three isomeric FREAs, Z1-aa, Z1-ab, and Z1-bb, were synthesized using different reaction sites of benzo[b]benzo[4,5]thieno[2,3-d]thiophene (BTBT)-based fused-ring cores and were used in organic solar cells (OSCs). As compared to Z1-aa and Z1-ab, Z1-bb exhibited red-shifted absorption and a higher maximum molar extinction coefficient. When blended with PM6, Z1-bb-based OSCs exhibited more balanced charge transport compared to those with the PM6:Z1-aa and PM6:Z1-ab blend films, which favored higher short-circuit current density (Jsc) and fill factor (FF). As a result, the OSC devices based on Z1-bb exhibited a power conversion efficiency (PCE) of 12.66% withVoc= 0.98 V,Jsc= 18.52 mA cm-2, and FF = 70.05%, respectively, which are significantly higher than the values recorded for the Z1-ab-based (PCE of 9.60%) and Z1-aa-based (PCE of 4.56%) devices. These results indicate that the isomerization of a fused-ring core originating from a special reaction site could be a promising approach to achieve high-performance OSCs with highJsc,Voc, and FF.
AB - Fused-ring electron acceptors (FREAs) have attracted immense interest owing to their ability for facile structural modification and good thermal and optical characteristics. Among these acceptors, isomerized building blocks originating from multiple reaction sites affect the electronic structures, morphological properties and resulting photovoltaic performance, but have rarely been studied. Herein, three isomeric FREAs, Z1-aa, Z1-ab, and Z1-bb, were synthesized using different reaction sites of benzo[b]benzo[4,5]thieno[2,3-d]thiophene (BTBT)-based fused-ring cores and were used in organic solar cells (OSCs). As compared to Z1-aa and Z1-ab, Z1-bb exhibited red-shifted absorption and a higher maximum molar extinction coefficient. When blended with PM6, Z1-bb-based OSCs exhibited more balanced charge transport compared to those with the PM6:Z1-aa and PM6:Z1-ab blend films, which favored higher short-circuit current density (Jsc) and fill factor (FF). As a result, the OSC devices based on Z1-bb exhibited a power conversion efficiency (PCE) of 12.66% withVoc= 0.98 V,Jsc= 18.52 mA cm-2, and FF = 70.05%, respectively, which are significantly higher than the values recorded for the Z1-ab-based (PCE of 9.60%) and Z1-aa-based (PCE of 4.56%) devices. These results indicate that the isomerization of a fused-ring core originating from a special reaction site could be a promising approach to achieve high-performance OSCs with highJsc,Voc, and FF.
UR - http://www.scopus.com/inward/record.url?scp=85085684733&partnerID=8YFLogxK
U2 - 10.1039/d0ta00451k
DO - 10.1039/d0ta00451k
M3 - Article
AN - SCOPUS:85085684733
SN - 2050-7488
VL - 8
SP - 9684
EP - 9692
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 19
ER -
