Selenium-containing two-dimensional conjugated fused-ring electron acceptors for enhanced crystal packing, charge transport, and photovoltaic performance

Wan, Shi-Sheng1,4; Zhao, Qiaoqiao2; Jiang, Zhao1; Yuan, Gui-Zhou1; Yan, Lu1; Ryu, Hwa Sook3; Mahmood, Asif1; Liu, Yan-Qiang1; Li, Heng2; Woo, Han Young3; He, Feng2; Wang, Jin-Liang1

2021-06-01

10.1039/d1ta03196a

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

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 (namely C8T-BDT4Cl and C8T-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 with C8T-BDT4Cl, C8T-BDSe4Cl exhibits 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, but C8T-BDSe4Cl exhibits more enhanced multiple intermolecular interactions with slightly shorter pi-pi interaction distances. A C8T-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 on C8T-BDSe4Cl:PM6 presented a much higher power conversion efficiency (PCE) of 13.5% with higher J(sc) than that of sulfur-containing analogue-based C8T-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 the J(sc) value and PCE of two-dimensional FREA-based PSCs.

SCI ; EI

英语

通讯

Natural Science Foundation of China[21971014,21672023] ; National Key Research and Development Program of China[2018YFA0901800] ; Shenzhen Fundamental Research Program[JCYJ20190809163011543] ; Feng He thanks Guangdong Provincial Key Laboratory of Catalysis[2020B121201002] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06G587] ; Shenzhen Sci-Tech Fund[KYTDPT20181011104007]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000670334100001

ROYAL SOC CHEMISTRY

20213010679316

Absorption spectroscopy ; Chlorine compounds ; Chlorine containing polymers ; Conjugated polymers ; Conversion efficiency ; Electrons ; Phase separation ; Red Shift ; Rings (components) ; Selenium ; Selenium compounds

Energy Conversion Issues:525.5 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Machine Components:601.2 ; Thermodynamics:641.1 ; Polymeric Materials:815.1 ; Organic Polymers:815.1.1

Web of Science

1.Beijing Inst Technol, Sch Chem & Chem Engn, Beying Key Lab Photoelect Electrophoton Convers M, Key Lab Cluster Sci,Minist Educ, Beijing 100081, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Grubbs Inst, Dept Chem, Guangdong Prov Key Lab Catalysis, Shenzhen 518055, Peoples R China
3.Korea Univ, Dept Chem, Seoul, South Korea
4.Beijing Natl Lab Mol Sci, Beijing, Peoples R China

Wan, Shi-Sheng,Zhao, Qiaoqiao,Jiang, Zhao,et al. Selenium-containing two-dimensional conjugated fused-ring electron acceptors for enhanced crystal packing, charge transport, and photovoltaic performance[J]. Journal of Materials Chemistry A,2021,9:15665-15677.

Wan, Shi-Sheng.,Zhao, Qiaoqiao.,Jiang, Zhao.,Yuan, Gui-Zhou.,Yan, Lu.,...&Wang, Jin-Liang.(2021).Selenium-containing two-dimensional conjugated fused-ring electron acceptors for enhanced crystal packing, charge transport, and photovoltaic performance.Journal of Materials Chemistry A,9,15665-15677.

Wan, Shi-Sheng,et al."Selenium-containing two-dimensional conjugated fused-ring electron acceptors for enhanced crystal packing, charge transport, and photovoltaic performance".Journal of Materials Chemistry A 9(2021):15665-15677.