Isomerization strategy on a non-fullerene guest acceptor for stable organic solar cells with over 19% efficiency

Energy & Environmental Science, Год журнала: 2023, Номер 16(7), С. 3119 - 3127

Опубликована: Янв. 1, 2023

Isomeric non-fullerene acceptor guest with large π-conjugation skeleton is used to construct stable organic solar cells efficiencies over 19%.

Язык: Английский

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19.7% efficiency binary organic solar cells achieved by selective core fluorination of nonfullerene electron acceptors

Joule, Год журнала: 2024, Номер 8(3), С. 835 - 851

Опубликована: Янв. 30, 2024

Язык: Английский

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Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(36)

Опубликована: Июль 18, 2023

Achieving both high open-circuit voltage (Voc ) and short-circuit current density (Jsc to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein energy loss (Eloss inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 dual-asymmetric bi-asy-YC9 bi-asy-YC12 are developed. They share the same asymmetric D1 AD2 (D1 =thieno[3,2-b]thiophene D2 =selenopheno[3,2-b]thiophene) fused-core but have different unidirectional sidechain on side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, crystallinity. Among binary blends, PM6 : one has better morphology with appropriate phase separation higher order than asy-YC9 bi-asy-YC11 ones. Therefore, bi-asy-YC12-based OSCs offer PCE 17.16 % Voc Jsc , due reduced Eloss efficient properties. Inspired by strong NIR-absorption, introduced into L8-BO construct ternary OSCs. Thanks broadened absorption, optimized morphology, furtherly minimized achieve champion 19.23 %, which highest efficiencies among these annealing-free devices. Our developed engineering constructing bi-asymmetric provides an approach

Язык: Английский

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On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 %

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(45)

Опубликована: Июнь 29, 2023

The determination of molecular conformations oligomeric acceptors (OAs) and their impact on packing are crucial for understanding the photovoltaic performance resulting polymer solar cells (PSCs) but have not been well studied yet. Herein, we synthesized two dimeric acceptor materials, DIBP3F-Se DIBP3F-S, which bridged segments Y6-derivatives by selenophene thiophene, respectively. Theoretical simulation experimental 1D 2D NMR spectroscopic studies prove that both dimers exhibit O-shaped other than S- or U-shaped counter-ones. Notably, this conformation is likely governed a distinctive "conformational lock" mechanism, arising from intensified intramolecular π-π interactions among terminal groups within dimers. PSCs based deliver maximum efficiency 18.09 %, outperforming DIBP3F-S-based (16.11 %) ranking highest efficiencies OA-based PSCs. This work demonstrates facile method to obtain OA highlights potential high-performance

Язык: Английский

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Halogenated Nonfused Ring Electron Acceptor for Organic Solar Cells with a Record Efficiency of over 17%

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Ноя. 23, 2023

Abstract Three nonfused ring electron acceptors (NFREAs), namely, 3TT‐C2‐F , 3TT‐C2‐Cl and 3TT‐C2 are purposefully designed synthesized with the concept of halogenation. The incorporation F or/and Cl atoms into molecular structure ( ) enhances π–π stacking, improves mobility, regulates nanofiber morphology blend films, thus facilitating exciton dissociation charge transport. In particular, films based on D18: demonstrate a high an extended diffusion distance, well‐formed network. These factors contribute to devices remarkable power conversion efficiency 17.19%, surpassing that (16.17%) (15.42%). To best knowledge, this represents highest achieved in NFREA‐based up now. results highlight potential halogenation NFREAs as promising approach enhance performance organic solar cells.

Язык: Английский

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Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Advanced Energy Materials, Год журнала: 2023, Номер 13(20)

Опубликована: Апрель 6, 2023

Abstract Developing efficient and stable all‐polymer solar cells (all‐PSCs) has received increasing attention because of their mechanical robustness for flexible devices. Based on the CH‐series small molecule acceptors, a new polymer acceptor (PZC24) is reported obtains decent power conversion efficiency (PCE) 16.82% when blended with PM6. To further improve performance, an oligomeric (CH‐D1), which possesses same backbone structure as PZC24, proposed synthesized third component all‐PSC system. The creative strategy improves crystallinity molecular packing, can maintain charge transport channels all‐PSCs binary Therefore, PM6:PZC24:CH‐D1 based ternary devices exhibit impressive PCE 17.40%, among highest value all‐PSCs. Compared to PM6:PZC24, device exhibits enhanced photosoaking stability thermal stability, simultaneously. In addition, introduction does not weaken As such, display excellent 15.35%. Importantly, this shows universality in PM6:PY‐IT PM6:PY‐V‐γ improved PCEs over 17%. results provide feasible simultaneously photovoltaic herald bright future

Язык: Английский

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Molecular Packing and Dielectric Property Optimization through Peripheral Halogen Swapping Enables Binary Organic Solar Cells with an Efficiency of 18.77%

Advanced Functional Materials, Год журнала: 2023, Номер 33(31)

Опубликована: Апрель 17, 2023

Abstract Peripheral halogen regulations can endow non‐fullerene acceptors (NFAs) with enhanced features as organic semi‐conductors and further boost efficient solar cells (OSCs). Herein, based on a remarkable molecular platform of CH14 more than six halogenation positions, preferred NFA CH23 is constructed by synergetic swapping both central end units, rendering the overall enlarged dipole moment, packing density thus relative dielectric constant. Consequently, CH23‐based binary OSC reaches an excellent efficiency 18.77% due to its improved charge transfer/transport dynamics, much better that 17.81% for control CH14. This work demonstrates great potential achieving state‐of‐the‐art OSCs delicately regulating formula these newly explored CH‐series NFAs.

Язык: Английский

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Self‐Assembled Molecules with Asymmetric Backbone for Highly Stable Binary Organic Solar Cells with 19.7 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(18)

Опубликована: Март 9, 2024

The hole-transporting material (HTM), poly (3,4-ethylene dioxythiophene) poly(styrene sulfonate) (PEDOT : PSS), is the most widely used in realization of high-efficiency organic solar cells (OSCs). However, stability PEDOT PSS-based OSCs quite poor, arising from its strong acidity and hygroscopicity. In addition, PSS has an absorption infrared region high highest occupied molecular orbital (HOMO) energy level, thus limiting enhancement short-circuit current density (J

Язык: Английский

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Designing a Novel Wide Bandgap Small Molecule Guest for Enhanced Stability and Morphology Mediation in Ternary Organic Solar Cells with over 19.3% Efficiency

Advanced Science, Год журнала: 2024, Номер 11(23)

Опубликована: Апрель 3, 2024

Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed carrier recombination, exciton dissociation. Consequently, significantly enhanced efficiency 18.62% device is achieved, accompanied increased short‐circuit current density ( J SC ), fill factor (FF), open‐circuit voltage V OC ). Building on success, replacing Y6 with BTP‐eC9 leads an outstanding PCE 19.33% OSCs. Notably, introduction expedites formation optimized morphology, resulting in impressive 18.04% without any postprocessing. Moreover, exhibits operational stability under maximum power point (MPP) tracking. This comprehensive study demonstrates that rationally can optimize reduce energy loss, streamline fabrication process, essential achieving high OSCs, paving way practical commercial applications.

Язык: Английский

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Impact of Electrostatic Interaction on Vertical Morphology and Energy Loss in Efficient Pseudo‐Planar Heterojunction Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(18)

Опубликована: Янв. 27, 2024

Abstract Although a suitable vertical phase separation (VPS) morphology is essential for improving charge transport efficiency, reducing recombination, and ultimately boosting the efficiency of organic solar cells (OSCs), there lack theoretical guidance on how to achieve ideal morphology. Herein, relationship between molecular structure VPS pseudo‐planar heterojunction (PPHJ) OSCs established by using surface electrostatic potential (ESP) as bridge. The morphological evolution mechanism revealed studying four binary systems with vary difference (∆ESP) donors (Ds) acceptors (As). findings manifest that ∆ESP increases, active layer more likely form well‐mixed phase, while smaller favors Interestingly, it also observed larger leads enhanced miscibility Ds As, resulting in higher non‐radiative energy losses (ΔE 3 ). Based these discoveries, ternary PPHJ device meticulously designed an appropriate obtain better lower ΔE , impressive 19.09% achieved. This work demonstrates optimizing ΔESP, not only formation can be controlled, but reduced, paving way further boost OSC performance.

Язык: Английский

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