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Sharp phase-separated interface of 6,13-bis(triisopropylsilylethynyl) pentacene/polystyrene blend films prepared by electrostatic spray deposition
摘要： In this study, organic field-effect transistors (OFETs) based on blend films comprising 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) and polystyrene (PS) were fabricated. The blend films were prepared by electrostatic spray deposition (ESD). A vertically phase-separated structure (TIPS pentacene (top)/PS (bottom)) can be spontaneously formed without additional treatments such as solvent-vapor annealing, which is significantly different from the blend with poly(methyl methacrylate) (PMMA). Due to the sharp phase-separated interface, OFETs based on the TIPS pentacene/PS blend films exhibited superior characteristics and operational stability.
关键词： Organic field-effect transistor,Small molecule/polymer blend,Electrostatic spray deposition,Vertical phase separation
更新于2025-09-23 15:22:29
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Potassium-Presenting Zinc Oxide Surfaces Induce Vertical Phase Separation in Fullerene-Free Organic Photovoltaics
摘要： Bulk heterojunction (BHJ) structure based organic photovoltaics (OPVs) have recently showed great potential for achieving high power conversion efficiencies (PCEs). An ideal BHJ structure would feature a large donor/acceptor interfacial area for efficient exciton dissociation and gradient distributions with high donor and acceptor concentrations near the anode and cathode, respectively, for efficient charge extraction. However, the random mixing of donor and acceptor in BHJ often suffers the severe charge recombination in the interface, resulting in poor charge extraction. Herein, we propose a new approach—treating the surface of the zinc oxide (ZnO) as electron transport layer with potassium hydroxide—to induce vertical phase separation of an active layer incorporating the non-fullerene acceptor IT-4F. Density functional theory calculations suggested that the binding energy difference between IT-4F and the PBDB-T-2Cl, to the potassium(K)-presenting ZnO interface is twice stronger than that for IT-4F and PBDB-T-2Cl to the untreated ZnO surface, such that it would induce more IT-4F moving toward the K-presenting ZnO interface than the untreated ZnO interface thermodynamically. Benefiting from efficient charge extraction, the best PCEs increased to 12.8% from 11.8% for PBDB-T-2Cl:IT-4F based devices, to 12.6% from 11.6% for PBDB-T-2Cl:Y1-4F based devices, to 13.5% from 12.2% for PBDB-T-2Cl:Y6 based devices, and to 15.7% from 15.1% for PM6:Y6 based devices.
关键词： DFT calculation,organic photovoltaics,potassium,vertical phase separation,non-fullerene acceptors
更新于2025-09-12 10:27:22