Over 18% Efficiency from Halogen-Free Solvent-Processed Polymer Solar Cells Enabled by Asymmetric Small Molecule Acceptors with Fluoro-Thienyl Extended Terminal
Artikel i vetenskaplig tidskrift, 2025
The potential impact of end-group (EG) in non-fullerene acceptor (NFA) on enabling green solvent-processable polymer solar cells (PSCs) remains underexplored, offering opportunities for advancements in environmentally friendly PSC development. Herein, the EG of 1′,1′-dicyanomethylene-4-fluoro-5-thienyl-3-indanone (IC-FT) is developed by modifying the state-of-the-art of Y6 derivative NFA, BTP-4F, resulting in two novel NFAs, namely BTP-FT and BTP-2FT. Distinctively, this study reveals that it is the noncovalent F···S interaction, other than the commonly believed strong hydrogen bonding of F···H that plays a key role in determining the final molecular conformation, as confirmed by means of 2D NMR study and Gibbs free energy calculations. The asymmetric BTP-FT possesses an upshifted lowest unoccupied molecular orbital level and enhances solubility in toluene. Consequently, it can mitigate phase separation, promote the formation of nanofibrillar morphology, facilitate exciton dissociation, and ultimately enhance the performance of the PSCs, achieving a high open circuit voltage of 0.900 V and a power conversion efficiency (PCE) of 17.56%. Furthermore, the ternary blend PM6:BTP-FT:BTP-4F achieves an enhance PCE of 18.39% in devices processed from toluene. This study offers a novel perspective on NFA design for high-efficiency and eco-friendly processable PSCs by enriching the array of electron-withdrawing EGs on NFA molecules.
non-halogen solvent
polymer solar cell
non-fullerene acceptor
power conversion efficiency
molecular conformation
Författare
Jingnan Wu
Aalborg Universitet
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Fengbo Sun
Shandong University
Xinxin Xia
Chinese University of Hong Kong
Shandong University
Leandro Rezende Franco
Karlstads universitet
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Qiaonan Chen
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Yúang Fu
Chinese University of Hong Kong
Rafael B. Ribeiro
Universidade de Sao Paulo (USP)
Uppsala universitet
Xinhui Lu
Chinese University of Hong Kong
C. Moyses Araujo
Uppsala universitet
Karlstads universitet
Xunchang Wang
Jianghan University
Renqiang Yang
Jianghan University
Xia Guo
Shandong University
Donghong Yu
Sino-Danish Center for Education and Research Denmark
Aalborg Universitet
Maojie Zhang
Shandong University
Ergang Wang
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Advanced Functional Materials
1616-301X (ISSN) 16163028 (eISSN)
Vol. In PressKonjugerade polymerer med länkade allkylsidkedjor för stabila polymersolceller
Vetenskapsrådet (VR) (2019-04683), 2020-01-01 -- 2023-12-31.
Ämneskategorier (SSIF 2025)
Materialkemi
Infrastruktur
Chalmers e-Commons (inkl. C3SE, 2020-)
DOI
10.1002/adfm.202423137