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Summary: While polymer/polymer blend systems still have lower power conversion efficiencies compared to small-molecule-acceptor-based systems, the use of a ternary blending strategy holds promise in achieving a desired nanoscale blend morphology to bridge the efficiency-stability gap in all-polymer solar cells. In this study, a narrow-band-gap chlorinated polymer acceptor (PY-2Cl) was incorporated into the PM6:PY-1S1Se host blend, resulting in extended absorption spectra, improved molecular packing, solidified blend microstructure, and reduced non-radiative recombination. The resulting ternary blend achieved a PCE of 18.2% (certified value 17.8%), the highest reported for all-PSCs. Furthermore, the ternary blend demonstrated lower Urbach energy and better operational stability compared to corresponding binary systems. This work paves the way for enhancing the development of high-performance all-polymer systems through molecular design and ternary strategies.
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Summary: By combining selenophene-fused core with naphthalene-containing end-group, a near-infrared (NIR)-absorbing small-molecule acceptor (SMA) Y-SeNF is developed and incorporated into a binary PM6:L8-BO host system, resulting in improved charge-transporting and suppressed non-radiative energy loss in ternary polymer solar cells (PSCs). The ternary PSCs achieve an impressive device efficiency of 19.28% with high photovoltage and photocurrent, and exhibit excellent stability under maximum-power-point tracking for over 200 hours. This study provides a novel strategy for efficient and stable PSCs towards practical applications.
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Qunping Fan et al.
Summary: In this study, a series of chlorinated PSMAs with high molecular weight, favorable intermolecular interaction, and improved physicochemical properties were developed by adjusting chlorinated positions and copolymerized sites on end groups. The optimized blend morphology and high molecular weight of the chlorinated PSMA resulted in increased ductility and improved power conversion efficiency in all-polymer solar cells.
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Summary: The rapid development of organic solar cells in recent decades has attracted considerable attention, with a focus on improving power conversion efficiency. The morphology of the active layer is crucial for device performance, and the use of solid additives has shown promise in enhancing efficiency. However, further research is needed to fully understand the working mechanisms and design rules for ideal solid additives in organic solar cells.
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Summary: A advanced interconnecting layer for tandem organic solar cell is developed in this study. By controlling the O-2 flux during evaporation, efficient electron extraction and low Schottky barrier are obtained, enabling effective charge recombination between two subcells. The tandem cell with the interconnecting layer shows a high efficiency of 20.27%.
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Summary: An efficient strategy of introducing boron atoms into phosphorus-doped nanoporous carbon alters the electronic structures of active sites, leading to better catalytic performance. The B/P co-doped nanoporous carbon exhibits remarkable catalytic activity for benzyl alcohol oxidation, achieving high yield and selectivity, as well as low activation energy. Moreover, it maintains high conversion and selectivity after multiple reaction cycles. Density functional theory calculations demonstrate that the introduction of boron significantly increases the electron density and changes the reaction pathway for benzyl alcohol oxidation.
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Baobing Fan et al.
Summary: The researchers developed a class of non-fullerene acceptors that can achieve efficiency as high as 18.3% and good stability when processed in xylene. The study highlights the importance of side-group steric hinderance of acceptors in achieving high-performance, stable, and eco-friendly organic photovoltaics.
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Jinhua Gao et al.
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Yanna Sun et al.
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Chengliang He et al.
Summary: Manipulating the donor:acceptor energetics is crucial for achieving balanced charge separation and recombination in organic solar cells (OSCs). In this study, a non-fullerene electron acceptor, BTP-H2, was designed and synthesized to pair with the polymer donor PM6, showing strong intermolecular interaction and near-zero highest occupied molecular orbital (HOMO) offset. The results demonstrated efficient charge separation and optimized energy conversion, leading to high-performance OSCs with a power conversion efficiency (PCE) of 18.5% and a peak photon-to-electron response of approximately 90%.
ENERGY & ENVIRONMENTAL SCIENCE
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Ruijie Ma et al.
Summary: This research focuses on the influence of morphology regulation strategies, such as ternary strategy and cosolvent engineering, on the performance of organic solar cells (OSCs). The addition of BN-T as the third component had different effects on the morphology evolution of different systems. This study provides an insightful understanding of the morphology evolution in ternary OSCs assisted by a high-boiling solvent additive via in situ investigation techniques.
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(2022)
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Sunan Bao et al.
Summary: Controlling the self-assembly of organic semiconductors to form well-developed nanoscale phase separation is critical for building high-performance organic solar cells. A new approach utilizing the synergistic effect of DTT and CN is developed to tune the morphology of the photoactive layer, leading to a significant increase in power-conversion efficiency and fill factor in ternary OSCs processed with dual additives of CN and DTT.
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Jingyang Xiao et al.
Summary: A novel fluorinated polythiophene derivative, P4T2F-HD, is introduced to significantly improve the morphology of bulk heterojunction active layers in organic solar cells. By optimizing the film morphology and interface structure, a record power conversion efficiency of 13.65% for polythiophene-based OSCs was achieved through the use of P4T2F-HD:Y6-BO films processed from nonhalogenated solvents.
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Jiehao Fu et al.
Summary: Introducing a solid additive, 1,4-diiodobenzene (DIB), can enhance the active layer structure of organic solar cells (OSC) and improve performance.
DIB treated OSCs exhibit tighter molecular stacking and more ordered molecular arrangement, leading to increased power conversion efficiency.
In addition to performance enhancement, DIB treatment also improves device stability and is versatile for various types of OSCs.
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Jinzhao Qin et al.
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