Simple Nonfused Ring Electron Acceptors with 3D Network Packing Structure Boosting the Efficiency of Organic Solar Cells to 15.44%

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(45)

Published: Oct. 17, 2021

Abstract Three nonfused ring electron acceptors (NFREAs; 2Th‐2F, BTh‐Th‐2F, and 2BTh‐2F) with thieno[3,2‐ b ]thiophene bearing two bis(4‐butylphenyl)amino substituents as the core, 3‐octylthiophene or 3‐octylthieno[3,2‐ spacer, 3‐(1,1‐dicyanomethylene)‐5,6‐difluoro‐1‐indanone terminal group are designed synthesized. The molar extinction coefficient of mobility blend films gradually increase increasing π‐conjugation length. Moreover, 2BTh‐2F displays a planar molecular conformation assisted by S···N S···O intramolecular interactions. More importantly, stacking changes from 2D packing for 2Th‐2F analog to 3D network 2BTh‐2F. Due these comprehensive merits, 2BTh‐2F:PBDB‐T‐based organic solar cells give high power conversion efficiency 14.53%. impressively, when D18 is used donor polymer, further enhanced 15.44%, which highest value reported based on NFREAs.

Language: Английский

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Process‐Aid Solid Engineering Triggers Delicately Modulation of Y‐Series Non‐Fullerene Acceptor for Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(20)

Published: March 22, 2022

Volatile solids with symmetric π-backbone are intensively implemented on manipulating the nanomorphology for improving operability and stability of organic solar cells. However, due to isotropic stacking, announced geometry cannot modify microscopic phase separation component distribution collaboratively, which will constrain promotion exciton splitting charge collection efficiency. Inspired by superiorities asymmetric configuration, a novel process-aid solid (PAS) engineering is proposed. By coupling BTP core unit in Y-series molecule, an asymmetric, volatile 1,3-dibromo-5-chlorobenzene can induce anisotropic dipole direction, elevated moment, interlaminar interaction spontaneously. Due synergetic effects favorable desired distribution, PAS-treated devices feature evident improvement splitting, transport, collection, accompanied suppressed trap-assisted recombination. Consequently, impressive fill factor 80.2% maximum power conversion efficiency (PCE) 18.5% device achieved. More strikingly, demonstrate promising thickness-tolerance character, where record PCE 17.0% yielded PAS 300 nm thickness photoactive layer, represents highest thick-film

Language: Английский

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Polymer Solar Cells with 18.74% Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(4)

Published: Oct. 13, 2021

Abstract The most popular approach to fabricating organic solar cells (OSCs) is solution processing a mixture of donor (D) and acceptor (A) materials into an active layer with bulk heterojunction (BHJ) nanostructure. Herein, it demonstrated that the interdigitated (IHJ) more suitable nanostructure for high‐performance OSCs whereas long standing challenge realize well‐defined IHJ structures. In this study, facile versatile sequential method developed produce power conversion efficiency reaching 18.74% (18.10% BHJ counterpart) by film nanopores created wax additive, sequentially casting on top infiltrating nanopores. Compared BHJ, structure interpillar distance within exciton diffusion length can afford large D/A interface efficient dissociation minimized charge recombination while free electrons holes transport respective electrodes through straightforward pathways, thus enhance performance. Furthermore, D or A phase in device contacts only one electrode, which prevent shunting between anode cathode facilitate industrial mass production OSCs.

Language: Английский

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Multi‐Selenophene‐Containing Narrow Bandgap Polymer Acceptors for All‐Polymer Solar Cells with over 15 % Efficiency and High Reproducibility

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(29), P. 15935 - 15943

Published: May 3, 2021

Abstract All‐polymer solar cells (all‐PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all‐PSCs are still restricted by a lack PSMAs with broad absorption, high electron mobility, low energy loss, good batch‐to‐batch reproducibility. A multi‐selenophene‐containing PSMA, PFY‐3Se, was developed based on selenophene‐fused SMA framework selenophene π‐spacer. Compared its thiophene analogue PFY‐0Se, PFY‐3Se shows ≈30 nm red‐shifted increased improved intermolecular interaction. In all‐PSCs, achieved an impressive PCE 15.1 % both short‐circuit current density 23.6 mA cm −2 fill factor 0.737, which among best values reported date much better than PFY‐0Se (PCE=13.0 %). Notably, maintains similarly properties for realizing reproducible device performance, is first also very rare PSMAs. Moreover, PFY‐3Se‐based show dependence area (0.045–1.0 2 ) active layer thickness (110–250 nm), indicating great potential toward applications.

Language: Английский

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Organic Solar Cells with Over 19% Efficiency Enabled by a 2D‐Conjugated Non‐Fullerene Acceptor Featuring Favorable Electronic and Aggregation Structures

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(32)

Published: May 27, 2023

The π-expansion of non-fullerene acceptors is a promising method for boosting the organic photovoltaic performance by allowing fine-tuning electronic structures and molecular packing. In this work, highly efficient solar cells (OSCs) are fabricated using 2D strategy to design new acceptors. Compared with quinoxaline-fused cores AQx-16, π-expanded phenazine-fused AQx-18 induce more ordered compact packing between adjacent molecules, affording an optimized morphology rational phase separation in blend film. This facilitates exciton dissociation inhibited charge recombination. Consequently, power conversion efficiency (PCE) 18.2% simultaneously increasing Voc , Jsc fill factor achieved AQx-18-based binary OSCs. Significantly, ternary devices via two-in-one alloy acceptor exhibit superior PCE 19.1%, one highest values ever reported OSCs, along high 0.928 V. These results indicate importance delicate regulation crystalline behaviors achieve performance, aimed at significantly promoting further development

Language: Английский

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Alkyl‐Chain Branching of Non‐Fullerene Acceptors Flanking Conjugated Side Groups toward Highly Efficient Organic Solar Cells

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(47)

Published: Oct. 29, 2021

Abstract Side‐chain modifications of non‐fullerene acceptors (NFAs) are essential for harvesting their full potential in organic solar cells (OSC). Here, an effective alkyl‐chain‐branching approach the Y‐series NFAs flanking meta‐substituted phenyl side groups at outer positions is demonstrated. Compared to BTP‐4F‐PC6 with linear m ‐hexylphenyl chains, two new named BTP‐4F‐P2EH and BTP‐4F‐P3EH developed bulkier alkyl chains branched β γ positions, respectively. These result altered molecular packing afford higher open‐circuit voltage devices. Despite blue‐shifted absorption branched‐chain NFAs, blends PBDB‐T‐2F enable improved short‐circuit current density corresponding devices owing more suitable phase separation better exciton dissociation. Consequently, OSCs based on yield enhanced device performance 18.22% 17.57%, respectively, outperforming BTP‐4F‐PC6‐based ones (17.22%). results highlight that side‐chain branching design has great optimizing properties promoting photovoltaic performance.

Language: Английский

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Non-fullerene acceptors with hetero-dihalogenated terminals induce significant difference in single crystallography and enable binary organic solar cells with 17.5% efficiency

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 15(1), P. 320 - 333

Published: Oct. 6, 2021

A synergistic hetero-dihalogenated terminals strategy was systematically employed for the first time to enhance single-crystal packing, boosting device performance of a Y-BO-FCl:PM6 with remarkable PCE 17.52%.

Language: Английский

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Organoboron molecules and polymers for organic solar cell applications

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 51(1), P. 153 - 187

Published: Dec. 1, 2021

This review summarizes the research progress in organoboron small molecules and polymers as photoactive materials for organic solar cells.

Language: Английский

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Design of Near‐Infrared Nonfullerene Acceptor with Ultralow Nonradiative Voltage Loss for High‐Performance Semitransparent Ternary Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 61(19)

Published: Dec. 28, 2021

Semitransparent organic solar cells (ST-OSCs) are considered as one of the most valuable applications OSCs and a strong contender in market. However, optical band gap current high-performance ST-OSCs is still not low enough to achieve optimal balance between power conversion efficiency (PCE) average visible transmittance (AVT). An N-substituted asymmetric nonfullerene acceptor SN with over 40 nm bathochromically shifted absorption compared Y6 was designed synthesized, based on which device PM6 donor obtained PCE 14.3 %, accompanied nonradiative voltage loss 0.15 eV. Meanwhile, ternary devices addition into : can 17.5 % an unchanged open-circuit improved short-circuit current. Benefiting from extended NIR lowered loss, were fabricated optimized demonstrated 14.0 at AVT 20.2 highest 20 %.

Language: Английский

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Developing Efficient Small Molecule Acceptors with sp²‐Hybridized Nitrogen at Different Positions by Density Functional Theory Calculations, Molecular Dynamics Simulations and Machine Learning

Chemistry - A European Journal, Journal Year: 2021, Volume and Issue: 28(2)

Published: Nov. 12, 2021

Chemical structure of small molecule acceptors determines their performance in organic solar cells. Multiscale simulations are necessary to avoid trial-and-error based design, ultimately save time and resources. In current study, the effect sp2 -hybridized nitrogen substitution at inner or outmost position central core, side chain, terminal group is investigated using multiscale computational modelling. Quantum chemical analysis used study electronic behavior. Nitrogen end-capping has significantly decreased electron-reorganization energy. No big change observed transfer integral excited state However, good way improve electron-mobility. Power conversion efficiency (PCE) newly designed predicted machine learning. Molecular dynamics also performed explore acceptor blends with PBDB-T polymer donor. Florgy-Huggins parameter calculated mixing PBDB-T. Radial distribution function indicated that a closer packing N3 N4. From all analysis, it found better strategy design efficient acceptors.

Language: Английский

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