ArticleAdvanced materials (Deerfield Beach, Fla.)2026
Electrostatic Potential Tuning by Low-Volatility Halogenated Additive: Boosting PTQ10-Based Binary OPV to Near 20% Efficiency with High Scalability.
Article in Advanced materials (Deerfield Beach, Fla.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The commercialization of organic photovoltaics (OPVs) is hampered by the trade-off between high power conversion efficiency (PCE) and processability, particularly in thick-film and large-area fabrication. Herein, three halogenated diphenyl ether additives with similar structures but distinct physical properties, 1-bromo-2-phenoxybenzene (o-BPB), 1-bromo-4-phenoxybenzene (p-BPB), and 4,4'-oxybis (bromobenzene) (BDPE), are selected to regulate the film-forming process of the PTQ10:m-TEH system. Studies reveal that BDPE exhibits the lowest electrostatic potential (ESP), maximum electron delocalization, and highest decomposition temperature, enabling its retention in the drying film. Through dibromo-induced negative ESP and π-π complementarity with m-TEH, BDPE forms directional noncovalent interactions that delay acceptor nucleation, suppress oversize phase separation, and promote ordered molecular stacking. This ESP-driven interaction simultaneously optimizes the vertical phase distribution, enhances crystallinity, reduces energy loss, extends exciton diffusion lifetime, and accelerates charge transport while suppressing recombination. Benefiting from these synergistic effects, the BDPE-based PTQ10: m-TEH device achieves a PCE of 19.80%, delivers a short-circuit current density of 30.49 mA cm
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