TY - JOUR
T1 - High efficiency (15.8%) all-polymer solar cells enabled by a regioregular narrow bandgap polymer acceptor
AU - Fu, Huiting
AU - Li, Yuxiang
AU - Yu, Jianwei
AU - Wu, Ziang
AU - Fan, Qunping
AU - Lin, Francis
AU - Woo, Han Young
AU - Gao, Feng
AU - Zhu, Zonglong
AU - Jen, Alex K.Y.
N1 - Publisher Copyright:
© 2021 American Chemical Society
PY - 2021/2/24
Y1 - 2021/2/24
N2 - Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, the relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating a benzotriazole (BTz)-core fused-ring segment, named the PZT series. Compared to the commonly used benzothiadiazole (BT)-containing polymer PYT, the less electron-deficient BTz renders PZT derivatives with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved Jsc and open-circuit voltage in the resultant all-PSCs. More importantly, a regioregular PZT (PZT-γ) has been developed to achieve higher regiospecificity for avoiding the formation of isomers during polymerization. Benefiting from the more extended absorption, better backbone ordering, and more optimal blend morphology with donor component, PZT-γ-based all-PSCs exhibit a record-high power conversion efficiency of 15.8% with a greatly enhanced Jsc of 24.7 mA/cm2 and a low energy loss of 0.51 eV.
AB - Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, the relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating a benzotriazole (BTz)-core fused-ring segment, named the PZT series. Compared to the commonly used benzothiadiazole (BT)-containing polymer PYT, the less electron-deficient BTz renders PZT derivatives with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved Jsc and open-circuit voltage in the resultant all-PSCs. More importantly, a regioregular PZT (PZT-γ) has been developed to achieve higher regiospecificity for avoiding the formation of isomers during polymerization. Benefiting from the more extended absorption, better backbone ordering, and more optimal blend morphology with donor component, PZT-γ-based all-PSCs exhibit a record-high power conversion efficiency of 15.8% with a greatly enhanced Jsc of 24.7 mA/cm2 and a low energy loss of 0.51 eV.
UR - http://www.scopus.com/inward/record.url?scp=85101699573&partnerID=8YFLogxK
U2 - 10.1021/jacs.0c12527
DO - 10.1021/jacs.0c12527
M3 - Article
C2 - 33566603
AN - SCOPUS:85101699573
SN - 0002-7863
VL - 143
SP - 2665
EP - 2670
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 7
ER -