TY - JOUR
T1 - Selenium-containing two-dimensional conjugated fused-ring electron acceptors for enhanced crystal packing, charge transport, and photovoltaic performance
AU - Wan, Shi Sheng
AU - Zhao, Qiaoqiao
AU - Jiang, Zhao
AU - Yuan, Gui Zhou
AU - Yan, Lu
AU - Ryu, Hwa Sook
AU - Mahmood, Asif
AU - Liu, Yan Qiang
AU - Li, Heng
AU - Woo, Han Young
AU - He, Feng
AU - Wang, Jin Liang
N1 - Funding Information:
This work was nancially supported by the grants from the Natural Science Foundation of China (No. 21971014, 21672023) and the National Key Research and Development Program of China (2018YFA0901800). Jin-Liang Wang was supported by the Thousand Youth Talents Plan of China and the BIT Teli Young Fellow Recruitment Program. The authors are grateful for Prof. Qiaoshi An (Beijing Institute of Technology) for the preparation of 2D GIWAXS samples. The authors are grateful for Hwa Sook Ryu and Prof. Han Young Woo (Korea University) for the 2D GIWAXS experiments and analysis. The authors thank Analysis & Testing Center, Beijing Institute of Technology for NMR and TGA experiments. Shi-Sheng Wan thanks Mr Zhao Jiang (Beijing Institute of Technology), Prof. Wei Wei (Capital Normal University), Prof. Jian Pei (Peking University), and Ze-Fan Yao (Peking University), for single-crystal preparation, crystallographic measurement, renement, and analysis. Qiaoqiao Zhao thanks the support from Shenzhen Fundamental Research Program (JCYJ20190809163011543), Feng He thanks Guangdong Provincial Key Laboratory of Catalysis (2020B121201002), Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06G587) and Shenzhen Sci-Tech Fund (KYTDPT20181011104007). The authors also thank the SUSTech Core Research Facilities for the AFM and TEM measurements.
Funding Information:
This work was financially supported by the grants from the Natural Science Foundation of China (No. 21971014, 21672023) and the National Key Research and Development Program of China (2018YFA0901800). Jin-Liang Wang was supported by the Thousand Youth Talents Plan of China and the BIT Teli Young Fellow Recruitment Program. The authors are grateful for Prof. Qiaoshi An (Beijing Institute of Technology) for the preparation of 2D GIWAXS samples. The authors are grateful for Hwa Sook Ryu and Prof. Han Young Woo (Korea University) for the 2D GIWAXS experiments and analysis. The authors thank Analysis & Testing Center, Beijing Institute of Technology for NMR and TGA experiments. Shi-Sheng Wan thanks Mr Zhao Jiang (Beijing Institute of Technology), Prof. Wei Wei (Capital Normal University), Prof. Jian Pei (Peking University), and Ze-Fan Yao (Peking University), for single-crystal preparation, crystallographic measurement, refinement, and analysis. Qiaoqiao Zhao thanks the support from Shenzhen Fundamental Research Program (JCYJ20190809163011543), Feng He thanks Guangdong Provincial Key Laboratory of Catalysis (2020B121201002), Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06G587) and Shenzhen Sci-Tech Fund (KYTDPT20181011104007). The authors also thank the SUSTech Core Research Facilities for the AFM and TEM measurements.
Publisher Copyright:
© The Royal Society of Chemistry 2021.
PY - 2021/7/28
Y1 - 2021/7/28
N2 - Although two-dimensional fused-ring electron acceptors (FREAs) have recently attracted increasing attention, designing highly efficient two-dimensional FREAs with a new heterocycle-based two-dimensional central core for further development is still a great challenge. Herein, two chlorinated two-dimensional fused-ring electron acceptors (namelyC8T-BDT4ClandC8T-BDSe4Cl) were synthesized for polymer solar cells, featuring with the two-dimensional conjugated central donor units by alkylthienyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) and benzo[1,2-b:4,5-b′]diselenophene (BDSe), respectively. Compared withC8T-BDT4Cl,C8T-BDSe4Clexhibits a red-shifted absorption spectrum and a narrower optical bandgap. Moreover, we first studied the single crystals of such two-dimensional conjugated FREAs and the crystallographic analysis indicates that both acceptors presented 3D network packing with three independent molecular conformations, butC8T-BDSe4Clexhibits more enhanced multiple intermolecular interactions with slightly shorter π-π interaction distances. AC8T-BDSe4Cl:PM6-based blend film exhibited a more favorable morphology with better face-on intermolecular packing with a longer coherent length and more suitable phase separation, resulting in more efficient charge separation, transport, and collection. Consequently, benefiting from the above-mentioned merits, polymer solar cells (PSCs) based onC8T-BDSe4Cl:PM6presented a much higher power conversion efficiency (PCE) of 13.5% with higherJscthan that of sulfur-containing analogue-basedC8T-BDT4Cl:PM6(12.2%). These results indicate a unique application prospect of the selenium-substituted FREAs and demonstrate that combination of the two-dimensional conjugated central core and selenium-substituted in the central electron-rich position strategy is an effective approach to improve theJscvalue and PCE of two-dimensional FREA-based PSCs.
AB - Although two-dimensional fused-ring electron acceptors (FREAs) have recently attracted increasing attention, designing highly efficient two-dimensional FREAs with a new heterocycle-based two-dimensional central core for further development is still a great challenge. Herein, two chlorinated two-dimensional fused-ring electron acceptors (namelyC8T-BDT4ClandC8T-BDSe4Cl) were synthesized for polymer solar cells, featuring with the two-dimensional conjugated central donor units by alkylthienyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) and benzo[1,2-b:4,5-b′]diselenophene (BDSe), respectively. Compared withC8T-BDT4Cl,C8T-BDSe4Clexhibits a red-shifted absorption spectrum and a narrower optical bandgap. Moreover, we first studied the single crystals of such two-dimensional conjugated FREAs and the crystallographic analysis indicates that both acceptors presented 3D network packing with three independent molecular conformations, butC8T-BDSe4Clexhibits more enhanced multiple intermolecular interactions with slightly shorter π-π interaction distances. AC8T-BDSe4Cl:PM6-based blend film exhibited a more favorable morphology with better face-on intermolecular packing with a longer coherent length and more suitable phase separation, resulting in more efficient charge separation, transport, and collection. Consequently, benefiting from the above-mentioned merits, polymer solar cells (PSCs) based onC8T-BDSe4Cl:PM6presented a much higher power conversion efficiency (PCE) of 13.5% with higherJscthan that of sulfur-containing analogue-basedC8T-BDT4Cl:PM6(12.2%). These results indicate a unique application prospect of the selenium-substituted FREAs and demonstrate that combination of the two-dimensional conjugated central core and selenium-substituted in the central electron-rich position strategy is an effective approach to improve theJscvalue and PCE of two-dimensional FREA-based PSCs.
UR - http://www.scopus.com/inward/record.url?scp=85110981235&partnerID=8YFLogxK
U2 - 10.1039/d1ta03196a
DO - 10.1039/d1ta03196a
M3 - Article
AN - SCOPUS:85110981235
SN - 2050-7488
VL - 9
SP - 15665
EP - 15677
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 28
ER -
