Dual Side Chain Functionalization of Small Molecule Acceptors Affords High‐Performance Organic Solar Cells With Refined Blend Morphology

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Abstract Regulating blend morphology in photoactive films is essential for enhancing the power conversion efficiency (PCE) of organic solar cells (OSCs). However, achieving precise control over remains a significant challenge due to difficulty simultaneously controlling thermodynamic and kinetic parameters that govern formation. In this study, series new small‐molecule acceptors (SMAs) employing dual side chain functionalization strategy designed incorporates trifluoromethyl (CF 3 ) phenyl (Ph) groups: SMA‐CH , SMA‐CF (with CF group), SMA‐Ph‐CF both groups). This approach successfully enables delicate tuning development high‐performance OSCs (PCE = 18.5%). enhances compatibility SMAs with hydrophobic D18 polymer donor, promoting formation intermixed donor/acceptor domains efficient charge generation. Meanwhile, improves SMA aggregation crystallinity, facilitating strong interconnected assembly transport. As result, binary based on D18:SMA‐Ph‐CF achieve significantly higher PCE 18.5%, compared 14.3% D18:SMA‐CH 16.5% D18:SMA‐CF OSCs. These results highlight importance optimizing

Language: Английский

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Unveiling the Mysterious Structure Growth of 2D and 3D All‐Inorganic Perovskite Nanocrystals in Solution Phase Dynamically by Using Small‐Wide Angle X‐Ray Scattering Spectroscopy

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

Abstract Real‐time analysis of the structural formation 2D and 3D perovskites in solution is challenging due to sensitivity perovskite intermediates environmental conditions their rapid growth. Conventional techniques often require stringent sample preparation, limiting ability study dynamic behaviors solution. In this study, small‐ wide‐angle X‐ray scattering (SWAXS) employed analyze morphology dynamics nanostructures native colloidal state. Unlike previous studies that attribute CsPbI 3 degradation delta‐phase formation, SWAXS revealed preexisting Cs 7 Pb 6 I 19 nanosheets pristine solutions. situ tracked transformation these structures during recrystallization diluted Adding bis(trimethylsilyl)sulfide (TMS) disassembled nanosheets, while subsequent a poor solvent formed highly crystalline nanosheets. The aligned with crystal growth theory, TMS concentration playing critical role. Higher concentrations slowed recrystallization, promoting stable lattice enhanced crystallinity, resulting bright yellow emission. Conversely, lower accelerated causing damage high‐crystallinity This highlights importance controlling rates through optimize crystallinity optoelectronic properties perovskites, offering insights into improving performance.

Language: Английский

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O, S, and N Bridged Atoms Screening on 2D Conjugated Central Units of High‐Performance Acceptors

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Almost all of central cores in high‐performance acceptors are limited to the electron‐withdrawing diimide structure currently, which constrains further acceptor structural innovation greatly. Herein, oxygen (O), sulfur (S), and nitrogen (N) atoms adopted bridge 2D conjugated cores, yielding three platforms CH─O, CH─S, CH─N that differ by only two atoms. Because characteristic atomic outer electron configuration hybrid orbital orientation, O‐, S‐, N‐bridged display quite different conformations electronic properties, namely, dibenzodioxin (planar, non‐aromatic), thianthrene (puckered, non‐aromatic) phenazine aromatic), respectively. A systematic investigation discloses how core, especially its p‐π overlap between lone pair on O/S/N coterminous benzene planes, affect intrinsic photoelectronic properties for first time. Finally, CH─N‐based binary device affords highest fill factor 83.13% organic photovoltaics along with a first‐class efficiency 20.23%. By evaluating strictly controlled molecular comprehensively, work reveals potential uniqueness determining excellent photovoltaic outcomes acceptors.

Language: Английский

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Perfluorophenyl-Incorporated Ferrocene: A Non-Volatile Solid Additive for Boosting Efficiency and Stability in Organic Solar Cells

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

In this study, we designed and synthesized a new non-volatile solid additive FcF10 by integrating two pentafluorophenyl (C6F5) groups into the cyclopentadienyl (CP) rings of ferrocene (Fc) through ester linkages. The with three-dimensional (3D) framework facilitated morphological optimization in PM6:Y6 system combination π···π, F···π, F···F interactions between CP C6F5 C6F2 Y6. FcF10-incorporated (3.75 wt %) PM6:Y6-based solar cell device achieved higher power conversion efficiency (PCE) 17.00%, Voc 0.85 V, Jsc 27.35 mA cm-2, an FF 73.29%, compared to pristine device. These improvements are attributed formation favorable active layer morphology, which enhances exciton dissociation charge transport while reducing bimolecular trap-assisted recombination. facilitates non-covalent Y6, such as F···F, π···π Cp FIC end supramolecular improve molecular stacking crystallinity within Y6 domain, evidenced red-shifted absorption, reduced π-π d-spacing, increased coherence lengths Furthermore, PM6:Y6:FcF10 demonstrates superior thermal stability, retaining 88% its initial PCE after prolonged annealing at 85 °C. Overall, incorporation achieves optimized stable donor-acceptor offering promising approach for high-performance thermally organic photovoltaics.

Language: Английский

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C-shaped A-D-A non-fullerene acceptor achieves efficient organic solar cells

Joule, Journal Year: 2024, Volume and Issue: 8(3), P. 572 - 575

Published: March 1, 2024

Language: Английский

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