To Fluorinate or Not to Fluorinate in Organic Solar Cells: Achieving a Higher PCE of 15.2% when the Donor Polymer is Halogen‐Free

Wu, Jianglin; Liao, Chuang‐Yi; Chen, Yao; Jacobberger, Robert M.; Huang, Wei; Zheng, Ding; Tsai, Kuen‐Wei; Li, Wei‐Long; Lu, Zhiyun; Huang, Yan; Wasielewski, Michael R.; Chang, Yi‐Ming; Marks, Tobin J.; Facchetti, Antonio

doi:10.1002/aenm.202102648

Title: To Fluorinate or Not to Fluorinate in Organic Solar Cells: Achieving a Higher PCE of 15.2% when the Donor Polymer is Halogen‐Free

Journal Article · Sat Nov 06 00:00:00 EDT 2021 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.202102648· OSTI ID:1829361

Wu, Jianglin ^[1]; Liao, Chuang‐Yi ^[2]; Chen, Yao ^[3]; Jacobberger, Robert M. ^[3]; Huang, Wei ^[3]; Zheng, Ding ^[3]; Tsai, Kuen‐Wei ^[2]; Li, Wei‐Long ^[2]; Lu, Zhiyun ^[4]; Huang, Yan ^[4]; Wasielewski, Michael R. ^[3]; Chang, Yi‐Ming ^[2]; Marks, Tobin J. ^[3];

^[5]

Department of Chemistry Center for Light Energy Activated Redox Processes (LEAP) and the Materials Research Center (MRC) Northwestern University 2145 Sheridan Road Evanston IL 60208 USA, Key Laboratory of Green Chemistry and Technology (Ministry of Education) College of Chemistry Sichuan University Chengdu 610064 P. R. China
Raynergy Tek Incorporation 2F, 60, Park Ave. 2, Hsinchu Science Park Hsinchu 30844 Taiwan
Department of Chemistry Center for Light Energy Activated Redox Processes (LEAP) and the Materials Research Center (MRC) Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
Key Laboratory of Green Chemistry and Technology (Ministry of Education) College of Chemistry Sichuan University Chengdu 610064 P. R. China
Department of Chemistry Center for Light Energy Activated Redox Processes (LEAP) and the Materials Research Center (MRC) Northwestern University 2145 Sheridan Road Evanston IL 60208 USA, Flexterra Inc. 8025 Lamon Avenue Skokie IL 60077 USA

Abstract Fluorination of the donor and/or acceptor blocks of photoactive semiconducting polymers is a leading strategy to enhance organic solar cell (OSC) performance. Here, the effects are investigated in OSCs using fluorine‐free ( TPD‐3 ) and fluorinated ( TPD‐3F ) donor polymers, paired with the nonfullerene acceptor Y6. Interestingly and unexpectedly, fluorination negatively affects performance, and fluorine‐free TPD‐3 :Y6 OSCs exhibit a far higher power conversion efficiency (PCE = 14.5%) than in the fluorine‐containing TPD‐3F :Y6 blends (PCE = 11.5%). Transmission electron microscopy (TEM) analysis indicates that the TPD‐3F :Y6 blends have larger phase domain sizes than TPD‐3 :Y6, which reduces exciton dissociation efficiency to 81% for TPD‐3F :Y6 versus 93% for TPD‐3 :Y6. Additionally, grazing incidence wide‐angle X‐ray scattering (GIWAXS) reveals that the TPD‐3F :Y6 blends are less textured than those of TPD‐3 :Y6, while space‐charge limited currents reveal lower and unbalanced hole/electron mobility in TPD‐3F :Y6 versus TPD‐3 :Y6 blends. Charge recombination dynamic, transient absorption, and donor–acceptor miscibility assays additionally support this picture. Furthermore, conventional architecture TPD‐3 :Y6 OSCs deliver a PCE of 15.2%, among the highest to date for halogen‐free polymer donor OSCs. Finally, a large‐area (20.4 cm ² ) TPD‐3 :Y6 blend module exhibits an outstanding PCE of 9.31%, one of the highest to date for modules of area >20 cm ² .

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Sponsoring Organization:: USDOE

OSTI ID:: 1829361

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 11 Journal Issue: 47; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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