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Optimized mixed phases to achieve improved performance of organic solar cells
摘要： In the three-phase (pure donor, pure acceptor, and mixed phases) morphologies of organic solar cells, the mixed phases produce an energy cascade that promotes the generation of free carriers. However, how to optimize the content of the mixed phases is a challenging problem. The authors proposed to control different content of mixed phases in DRTB-T and IDIC blends by additive and solvent vapor annealing (SVA). The authors ?rst formed the largest extent amount of mixed phases by the additive cinene (2%) to inhibit the crystallization of DRTB-T and IDIC. And then, different amounts of mixed phases were achieved by further SVA for different times (from 0 to 50 s) to increase the content of pure DRTB-T and IDIC phases. The energetic offsets (ΔE) of pure and mixed phases gradually decrease from 0.529 to 0.477 eV for different content of mixed phases. When ΔE was 0.498 eV, the highest photocurrent density (Jsc) was obtained. The power conversion ef?ciency was increased from 3.23% (without any treatment) to 8.54%. Therefore, the authors demonstrated that the optimized content of the mixed phases is critical to device performance.
关键词： solvent vapor annealing,additive,organic solar cells,power conversion efficiency,DRTB-T,energy cascade,cinene,IDIC,mixed phases
更新于2025-09-11 14:15:04
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Doping effects on mixed-phase crystalline perovskite AxSr1?xFeO3?δ (A?=?Pr, Sm; 0?≤?x??≤?0.8) nanoparticles and their application for photodegradation of rhodamine B
摘要： A series of doped perovskite AxSr1?xFeO3?δ (A = Pr, Sm; 0 ≤ x ≤ 0.8) nanoparticles were synthesized using a solution combustion method. By doping lanthanide elements, the crystal phase of the perovskite SrFeO3?δ (SFO) changed from cubic to orthorhombic system. Phase transitions and mixed-phase components of prepared catalysts can be successfully controlled only by varying the mole ratio of A-site doping at 800 °C for 5 h. Compared with pure SFO, the Pr/Sm-doped SFO samples exhibited enhanced absorption capability especially in the visible light region. The band gap of Pr/Sm-doped SFO samples was gradually decreased and the BET surface area increased with the increase of the Pr and Sm dopant content. The perovskite AxSr1?xFeO3?δ (A = Pr, Sm; x = 0.6, 0.8) included mixed phases of cubic and orthorhombic crystallinity and exhibited better photocatalytic degradation of rhodamine B (RhB) than single cubic phase. The photodegradation efficiency of RhB was increased with an increasing amount of A-site doping.
关键词： Phase transition,Perovskite,Photocatalytic oxidation,Photodegradation,Mixed phases
更新于2025-09-09 09:28:46
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Enhanced photocatalytic characteristics by Ag-sensitized TiO2 photocatalysts with mixed phases
摘要： The Ag-sensitized TiO2 photocatalysts with various contents of Ag were fabricated by a facile sol-gel method. The Ag nanoparticles with an average diameter of only a few nanometers distributed uniformly over the TiO2 surface. Their presence resulted in suppressed recombination and more effective utilization of the visible-light radiation through surface plasmon resonance. However, excess Ag nanoparticles led to higher recombination rates, reduced surface area, and thereby lower photocatalytic activity. Comparative study on the photocatalytic performance of the photocatalysts without and with various Ag loadings was systematically carried out. The moderate reduction of Ag nanoparticles by an appropriate surface treatment condition to increase the area for dye adsorption was favorable to photodegradation. By double calcinations, mixed phases of anatase and rutile were obtained, which exhibited better performance than single phase. The synergistic effect of Ag nanoparticles, mixed phase TiO2 and high surface area has qualified the Ag-sensitized TiO2 nanocomposites as highly promising photocatalysts.
关键词： Calcination,Photodegradation,Ag-sensitized,TiO2,Ag decoration,Mixed phases
更新于2025-09-04 15:30:14