Compromising Charge Generation and Recombination of Organic Photovoltaics with Mixed Diluent Strategy for Certified 19.4% Efficiency

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 3, 2023

The ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due dilution effect. While compromise between charge generation and recombination remains a challenge. Here, mixed diluent for further improving efficiency OPV proposed. Specifically, high-performance system with polymer donor, i.e., PM6, nonfullerene acceptor (NFA), BTP-eC9, diluted by diluents, which involve high bandgap NFA BTP-S17 low BTP-S16 (similar that BTP-eC9). better miscibility BTP-eC9 can dramatically enhance open-circuit voltage (VOC ), while maximizes or short-circuit current density (JSC ). interplay BTP-17 enables recombination, thus leading 19.76% (certified 19.41%), best among single-junction OPVs. Further analysis on carrier dynamics validates efficacy diluents balancing be attributed more diverse energetic landscapes improved morphology. Therefore, this work provides commercialization.

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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Solid Additive-Assisted Layer-by-Layer Processing for 19% Efficiency Binary Organic Solar Cells

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: April 10, 2023

Morphology is of great significance to the performance organic solar cells (OSCs), since appropriate morphology could not only promote exciton dissociation, but also reduce charge recombination. In this work, we have developed a solid additive-assisted layer-by-layer (SAA-LBL) processing fabricate high-efficiency OSCs. By adding additive fatty acid (FA) into polymer donor PM6 solution, controllable pre-phase separation forms between and FA. This intermixed facilitates diffusion acceptor Y6 during LBL processing, due good miscibility fast-solvation FA with chloroform solution dripping. Interestingly, results in desired refined phase-separated domain vertical phase-separation structure better balance transport /collection dissociation. Consequently, binary single junction OSCs based on PM6:Y6 blend reach champion power conversion efficiency (PCE) 18.16% SAA-LBL which can be generally applicable diverse systems, e.g., PM6:L8-BO-based devices thick-film devices. The efficacy confirmed PM6:L8-BO, where record PCEs 19.02% 16.44% are realized for 100 250 nm active layers, respectively. work provides simple effective way control demonstrates promising methodology boosting industrial manufacturing

Language: Английский

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Suppressing electron-phonon coupling in organic photovoltaics for high-efficiency power conversion

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Aug. 21, 2023

The nonradiative energy loss (∆Enr) is a critical factor to limit the efficiency of organic solar cells. Generally, strong electron-phonon coupling induced by molecular motion generates fast decay and causes high ∆Enr. How restrict achieve low ∆Enr sticking point. Herein, free volume ratio (FVR) proposed as an indicator evaluate motion, providing new design rationale suppress decay. Theoretical experimental results indicate proper proliferation alkyl side-chain can decrease FVR leading reduced while maintaining ideal nanomorphology. favorable morphology are simultaneously obtained in AQx-6 with pinpoint chain proliferation, achieving PCE 18.6% optimized VOC, JSC FF. Our study discovered aggregation-state regulation great importance reduction coupling, which paves way high-efficiency OSCs.

Language: Английский

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Achieving 19.4% organic solar cell via an in situ formation of p-i-n structure with built-in interpenetrating network

Joule, Journal Year: 2024, Volume and Issue: 8(2), P. 509 - 526

Published: Jan. 11, 2024

Language: Английский

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High‐Performance Small Molecule Organic Solar Cells Enabled by a Symmetric‐Asymmetric Alloy Acceptor with a Broad Composition Tolerance

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(23)

Published: March 29, 2023

Abstract Using a combinatory blending strategy is demonstrated as promising path for designing efficient organic solar cells (OSCs) by boosting the short‐circuit current density and fill factor. Herein, high‐performance ternary all‐small molecule OSC (all‐SMOSCs) using narrow‐bandgap alloy acceptor containing symmetric asymmetric molecules (BTP‐eC9 SSe‐NIC) wide‐bandgap small donor MPhS‐C2 reported. Introducing synthesized SSe‐NIC into MPhS‐C2:BTP‐eC9 host system can broaden absorption spectrum, modulate energy offsets, optimize molecular packing of materials. After systematically optimizing weight ratio MPhS‐C2:BTP‐eC9:SSe‐NIC, champion efficiency 18.02% achieved. Impressively, not only delivered broad composition tolerance with device efficiencies over 17% throughout whole blend ratios, but also exhibited less non‐geminate recombination loss, better‐light‐soaking stability than corresponding binary systems. This work promotes development all‐SMOSCs heralds their brighter application prospects.

Language: 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, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 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

Language: Английский

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Achieving Record‐High Stretchability and Mechanical Stability in Organic Photovoltaic Blends with a Dilute‐absorber Strategy

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(8)

Published: Oct. 22, 2023

Organic solar cells (OSCs) have potential for applications in wearable electronics. Except high power conversion efficiency (PCE), excellent tensile properties and mechanical stability are required achieving high-performance OSCs, while the present metrics barely meet stretchable requirements. Herein, this work proposes a facile low-cost strategy constructing intrinsically OSCs by introducing readily accessible polymer elastomer as diluent all-polymer photovoltaic blends. Remarkably, record-high stretchability with fracture strain of up to 1000% elastic recovery >90% under cyclic tests realized active layers first time. Specifically, best-performing blends increased 250 times after blending. Previously unattainable performance (fracture >50% PCE >10%) achieved simultaneously resulting films. Furthermore, an overall evaluation parameter y is proposed efficiency-cost- balance blend The value dilute-absorber system two orders magnitude greater than those prior state-of-the-art systems. Additionally, devices prepared showcase stability. Overall, offers new avenue comprehensively evaluating organic electronic

Language: Английский

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Manipulating Vertical Phase Separation Enables Pseudoplanar Heterojunction Organic Solar Cells Over 19% Efficiency via Ternary Polymerization

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(5)

Published: Nov. 8, 2023

Abstract Controlling vertical phase separation of the active layer to enable efficient exciton dissociation and charge carrier transport is crucial boost power conversion efficiencies (PCEs) pseudoplanar heterojunction (PPHJ) organic solar cells (OSCs). However, how optimize PPHJ OSCs via molecule design rarely reported yet. Herein, ternary polymerization strategy employed develop a series polymer donors, DL1‐DL4, regulate their solubility, molecular aggregation, orientation, miscibility, thus efficiently manipulating in OSCs. Among them, DL1 not only has enhanced inhibited aggregation partial edge‐on orientation facilitate acceptor molecules, Y6, permeate into increase donor/acceptor interfaces, but also sustains high crystallinity appropriate miscibility with Y6 acquire ordered packing, achieving optimized well juggle devices. Therefore, DL1/Y6 based gain best probability, highest mobilities weakest recombination, afford an impressive PCE 19.10%, which record value for terpolymer donors. It demonstrates that method PCEs.

Language: Английский

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Simultaneous Improvements in Efficiency and Stability of Organic Solar Cells via a Symmetric‐Asymmetric Dual‐Acceptor Strategy

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(20)

Published: April 5, 2023

Abstract Simultaneously achieving improvements in power conversion efficiency (PCE) and stability is the main task of current development stage organic solar cells (OSCs). This work reports a symmetry–asymmetry dual‐acceptor (SADA) strategy to construct ternary devices, which found be feasible for increasing both PCE operational lifetime OSCs. In this contribution, symmetric acceptor L8‐BO asymmetric BTP‐S9 are blended equal proportions with polymer donor PM6 consideration absorption spectrum complementarity cascade energetic alignment. addition, features crystallinity miscibility deliver optimized morphology lead high 18.84%. larger dipole moment shows tighter molecular stacking longer crystal correlation length, favor intrinsic photostability, further consolidate OSCs when coordinated L8‐BO. demonstrates efficacy SADA constructing efficient stable

Language: Английский

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