p Influence of Fluorine Substitution on the Photovoltaic Performance of Wide Band Gap Polymer Donors for Polymer Solar Cells

Shi, Yongqiang3; Ma, Ruijie1,2; Wang, Xin3; Liu, Tao1,2,8; Li, Yongchun4; Fu, Sheng5; Yang, Kun4; Wang, Yang6; Yu, Changjiang3; Jiao, Lijuan3; Wei, Xianwen3; Fang, Junfeng5,7; Xue, Dongfeng8; Yan, He1,2

2022

10.1021/acsami.1c23196

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

The design and development of wide band gap (WBG) polymer donors are critical for achieving high power conversion efficiencies (PCEs) in polymer solar cells. In this work, four WBG polymer donors, Q4, Q5, Q6, and Q7, with different numbers and positions of fluorine substitution (n = 0, 2, 2, and 4, respectively) were prepared, and the effect of fluorination on their photovoltaic performance was systematically investigated. When blended with a small-molecule electron acceptor MeIC, the devices based on Q4, Q5, Q6, and Q7 showed PCEs of 10.34, 11.06, 5.26, and 0.48%, respectively. When coupled with a low band gap polymer acceptor PYIT to fabricate all-polymer solar cells (all-PSCs), while the other three polymers (Q5-Q7) exhibited much lower PCEs in the range of 0.12-6.71%, the Q4 polymer-based all-PSCs showed the highest PCE of 15.06%, comparable to that of the devices fabricated with the star polymer donor PM6 (PCE = 15.00%). Detailed physicochemical and morphological studies revealed that an oversubstitution of F in Q7 results in undesired low-lying HOMO levels and phase separation with the acceptors, thus resulting in its inferior PCEs. Moreover, the less F-substitution and controlling of the positions of F-substitution position in Q4 and Q5 can improve the HOMO energy level matching as well as morphologies between these two polymers with the acceptors, which in turn gives rise to higher performances. Clearly, our results indicate that Q4 is a promising donor candidate for high-performance all-PSCs, and the fine-tuning of both the number and positions of F-substitution in the polymer backbone is essential in developing highperformance WBG polymer donors.

wide band gap polymer donor all-polymer solar cells high-performance fl uorine substitution

SCI ; EI

英语

其他

National Natural Science Foundation of China[22105004] ; Hong Kong Ph.D.[PF17-03929] ; National Natural Science Foundation of China (NSFC)[51832007] ; Natural Science Foundation of Shandong Province[ZR2020ZD35]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000745241300001

AMER CHEMICAL SOC

20220611590536

Energy gap ; Phase separation ; Photovoltaic effects ; Solar power generation

Solar Power:615.2 ; Thermodynamics:641.1 ; Solar Cells:702.3 ; Chemical Operations:802.3

Web of Science

1.Hong Kong Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Optoelect & M, Energy Inst, Dept Chem,Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China
2.Hong Kong Univ Sci & Technol, Hong Kong Branch, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China
3.Anhui Normal Univ, Sch Chem & Mat Sci, Wuhu 241002, Anhui, Peoples R China
4.Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
5.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China
6.Xiamen Univ, Coll Mat, Fujian Key Lab Adv Mat, Xiamen 361005, Peoples R China
7.East China Normal Univ, Minist Educ, Engn Res Ctr Nanophoton & Adv Instrument, Sch Phys & Mat Sci, Shanghai 200241, Peoples R China
8.Chinese Acad Sci, Shenzhen Inst Adv Technol, Multiscale Crystal Mat Res Ctr, Shenzhen 518055, Peoples R China

Shi, Yongqiang,Ma, Ruijie,Wang, Xin,et al. p Influence of Fluorine Substitution on the Photovoltaic Performance of Wide Band Gap Polymer Donors for Polymer Solar Cells[J]. ACS Applied Materials & Interfaces,2022,14(4):5740-5749.

Shi, Yongqiang.,Ma, Ruijie.,Wang, Xin.,Liu, Tao.,Li, Yongchun.,...&Yan, He.(2022).p Influence of Fluorine Substitution on the Photovoltaic Performance of Wide Band Gap Polymer Donors for Polymer Solar Cells.ACS Applied Materials & Interfaces,14(4),5740-5749.

Shi, Yongqiang,et al."p Influence of Fluorine Substitution on the Photovoltaic Performance of Wide Band Gap Polymer Donors for Polymer Solar Cells".ACS Applied Materials & Interfaces 14.4(2022):5740-5749.