TY - JOUR
T1 - Fine-tuned crystallinity of polymerized non-fullerene acceptor via molecular engineering towards efficient all-polymer solar cell
AU - Li, Yuxiang
AU - Wang, Mei
AU - Zhang, Qilin
AU - Wu, Ziang
AU - Lim, Hyojin
AU - Wang, Yingying
AU - Qin, Hongmei
AU - Yang, Jianye
AU - Gao, Chao
AU - Young Woo, Han
AU - Yuan, Jianyu
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 21905225, 52073198 and 51803144), the Science and Technology Program of Shaanxi Province (2019JQ-244 and 2019JQ-076), the Outstanding Youth Science and Technology Foundation of Xi’an University of Science and Technology (2019YQ3-03), the China Postdoctoral Science Foundation (Grant No. 2019M651942) and “111” projects. The author thanks the Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University. H.Y.W. is thankful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070).
Publisher Copyright:
© 2021
PY - 2022/1/15
Y1 - 2022/1/15
N2 - Despite remarkable advancement made by virtue of “polymerized non-fullerene acceptor” strategy in all-polymer solar cells (all-PSCs) recently, the tuning of polymer crystallinity via molecular design to optimize the nanostructured blend morphology remains challenging for boosting the short-circuit current density (JSC). Herein, through systematically optimizing the central core and π-spacer, we present a facile method to regulate the solid-state crystallinity of these emerging polymer acceptors. Specifically, we have synthesized a new family of polymerized non-fullerene acceptors named PY-2T and PY-2T2Cl by copolymerizing the Y5-derivative with bithiophene or chlorinated bithiophene. Compared to the previously used IDIC-based polymer named PIDIC-2T, the extended D-A-D fused ring core renders PY-2T with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved JSC and open circuit voltage (VOC) in the resultant all-PSCs. More importantly, the chlorinated PY-2T (PY-2T2Cl) endows the desirable phase separated blend morphology with favorable film crystallinity when paired with polymer donor PBDB-T, thus PY-2T2Cl based all-PSCs delivers a promising power conversion efficiency of approaching ~10% with a greatly enhanced JSC of 16.3 mA/cm2 and high VOC of 0.87 eV. This systematic study provides an insight into the effect of central core and π-spacer on the film crystallinity for developing high-performance polymerized non-fullerene acceptors, and also highlights the importance of both absorption and morphology in boosting the desired JSC in all-PSCs.
AB - Despite remarkable advancement made by virtue of “polymerized non-fullerene acceptor” strategy in all-polymer solar cells (all-PSCs) recently, the tuning of polymer crystallinity via molecular design to optimize the nanostructured blend morphology remains challenging for boosting the short-circuit current density (JSC). Herein, through systematically optimizing the central core and π-spacer, we present a facile method to regulate the solid-state crystallinity of these emerging polymer acceptors. Specifically, we have synthesized a new family of polymerized non-fullerene acceptors named PY-2T and PY-2T2Cl by copolymerizing the Y5-derivative with bithiophene or chlorinated bithiophene. Compared to the previously used IDIC-based polymer named PIDIC-2T, the extended D-A-D fused ring core renders PY-2T with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved JSC and open circuit voltage (VOC) in the resultant all-PSCs. More importantly, the chlorinated PY-2T (PY-2T2Cl) endows the desirable phase separated blend morphology with favorable film crystallinity when paired with polymer donor PBDB-T, thus PY-2T2Cl based all-PSCs delivers a promising power conversion efficiency of approaching ~10% with a greatly enhanced JSC of 16.3 mA/cm2 and high VOC of 0.87 eV. This systematic study provides an insight into the effect of central core and π-spacer on the film crystallinity for developing high-performance polymerized non-fullerene acceptors, and also highlights the importance of both absorption and morphology in boosting the desired JSC in all-PSCs.
KW - All-polymer solar cells
KW - Central core
KW - Chlorinated π-spacer
KW - Photovoltaic performance
KW - Polymerized non-fullerene acceptor
UR - http://www.scopus.com/inward/record.url?scp=85109835548&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.131232
DO - 10.1016/j.cej.2021.131232
M3 - Article
AN - SCOPUS:85109835548
SN - 1385-8947
VL - 428
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 131232
ER -