Hydrogen‐Bonding Interactions Between Terpolymers Enable Excellent Device Efficiency and Operational Stability of Non‐Halogenated Solvent‐Processed Polymer Solar Cells

• DOI: 10.1002/adfm.202402045
• Publication Date: 2024-04-05T10:50:20Z
• Authors: Fiza Arshad; Muhammad Haris; Eun Sung Oh; Zakir Ullah; Du Hyeon Ryu; Seungjin Lee; Hang Ken Lee; Sang Kyu Lee; Taek‐Soo Kim; Hyung‐Wook Kwon; Chang Eun Song; Won Suk Shin
• Keywords: Moiety; Thermal Stability

Abstract Although polymer solar cells (PSCs) have shown considerable power conversion efficiency (PCE) potential, their poor operational stability is a major obstacle for future commercialization. In this study, the ternary‐blend strategy based on D1–A–D1–D2‐type conjugated random terpolymers containing hydrogen–bonding sites employed to simultaneously improve device and long‐term stability. Notably, PM6‐ThEG:PM6‐ThOH:Y6‐BO system exhibits remarkable PCE of 17.2% with superior photo, thermal, mechanical stability, outperforming those binary devices PM6, PM6‐ThEG, PM6‐ThOH donors. These outstanding results are likely attributed robust molecular lock via hydrogen bonds between PM6‐ThEG terpolymers, which can induce strong intermolecular packing, dense 3D terpolymer network, optimized morphology. also correlate well computational study. A comprehensive analysis optoelectronic morphological properties as exploration underlying physical mechanisms collectively verifies effectiveness approach mixed hydrogen‐bonding moiety achieve non‐halogenated solvent‐processed PSCs exceptional