Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Using a low-toxic non-halogenated solvent during fabrication processing is critical for the commercial application of organic solar cells (OSCs). However, due to the poor solubility and disagreeable morphology when processed with non-halogenated solvents, the current high-performance OSCs are often achieved by using toxic solvents. Herein, through terpolymer designing and solvent engineering synergistically, we demonstrated a remarkable OSC using non-halogenated solvent and reached an efficiency of 18% with a high fill factor of 76.7%. Herein, a 50 mol% TTz unit was introduced into the polymer backbone of PM7[1] to meet the demand for solubility. Encouragingly, nearly perfect coplanarity is obtained because the incorporation of the TTz unit affects the planar conformation of the polymer backbone. Moreover, the use of a high boiling point solvent extends the aggregate process time. Consequently, the corresponding terpolymer (PM7-TTz50) film retains its intrinsic crystallinity and tight π-π stacking processed with toluene though with a nearly total random structure. When paired with Y-series norfullerene acceptor BTP-eC8-4F, the Tol-processed device exhibits suppressed charge recombination, better exciton dissociation, charge transport and collection capabilities, reduced energy loss, and an optimized morphology than the parent polymer and CF-processed based ones. This strategy provides an effective approach to constructing high-performance devices using non-halogenated solvents and adds to the industrial development of OSC.
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