Fine-tuned crystallinity of polymerized non-fullerene acceptor via molecular engineering towards efficient all-polymer solar cell
- Authors
- Li, Yuxiang; Wang, Mei; Zhang, Qilin; Wu, Ziang; Lim, Hyojin; Wang, Yingying; Qin, Hongmei; Yang, Jianye; Gao, Chao; Woo, Han Young; Yuan, Jianyu
- Issue Date
- 15-1월-2022
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Polymerized non-fullerene acceptor; Central core; Chlorinated pi-spacer; All-polymer solar cells; Photovoltaic performance
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.428
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 428
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135264
- DOI
- 10.1016/j.cej.2021.131232
- ISSN
- 1385-8947
- Abstract
- 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 pi-spacer, we present a facile method to regulate the solidstate 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 similar to 10% with a greatly enhanced JSC of 16.3 mA/cm(2) and high VOC of 0.87 eV. This systematic study provides an insight into the effect of central core and pi-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.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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