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

Advanced Materials, Год журнала: 2023, Номер 36(8)

Опубликована: Окт. 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

Язык: Английский

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BN‐Bond‐Embedded Triplet Terpolymers with Small Singlet–Triplet Energy Gaps for Suppressing Non‐Radiative Recombination and Improving Blend Morphology in Organic Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(17)

Опубликована: Фев. 3, 2023

Suppressing the photon energy loss (Eloss ), especially non-radiative loss, is of importance to further improve device performance organic solar cells (OSCs). However, typical π-conjugated semiconductors possess a large singlet-triplet gap (ΔEST leading lower triplet state than charge transfer and contributing channel photocurrent by state. Herein, series polymer donors are developed introducing BNIDT block into PM6 backbone. The high electron affinity opposite resonance effect BN bond in results lowered highest occupied molecular orbital (HOMO) largely reduced ΔEST . Moreover, morphology active blends also optimized fine-tuning content. Therefore, recombination via terminal channels traps effectively suppressed. PNB-3 (with 3% BNIDT):L8-BO exhibits both small morphology, favoring more efficient transport. Finally, simultaneously enhanced Voc 0.907 V, Jsc 26.59 mA cm-2 , FF 78.86% contribute champion PCE 19.02%. bonds benchmark polymers possible avenue toward higher-performance OSCs.

Язык: Английский

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Surface Regulation with Polymerized Small Molecular Acceptor Towards Efficient Inverted Perovskite Solar Cells

Advanced Energy Materials, Год журнала: 2023, Номер 13(18)

Опубликована: Март 22, 2023

Abstract Optimizing the interface between perovskite and transport layers is an efficient approach to promote photovoltaic performance of inverted solar cells (IPSCs). Given decades advances in bulk materials optimization, IPSCs has been pushed its limits by engineering with a power conversion efficiency (PCE) over 25% excellent stability. Herein, n‐type polymeric semiconducting material, PY‐IT, that shown remarkable organic photovoltaics, introduced as regulator ETL. Encouragingly, this polymerized small molecular acceptor (PSMA) exhibits significant effectiveness both passivation defects electron transfer facilitation properties merits strong planarity rotatable linkers, which significantly optimizes grain growth orientation added charge channels. As result, PSMA‐treated IPSC devices obtain optimal 23.57% fill factor 84%, among highest PSMA‐based IPSCs. Meanwhile, photo‐stability PSMA eye‐catching, maintaining ≈80% initial PCE after 1000 h simulated 1‐sun illumination under maximal point tracking. This work combines achievements polymer science device provide new insight into regulation stable devices.

Язык: Английский

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Manipulating Polymer Backbone Configuration via Halogenated Asymmetric End‐Groups Enables Over 18% Efficiency All‐Polymer Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(16)

Опубликована: Янв. 23, 2023

High-performance all-polymer solar cells (all-PSCs) deeply rely on the joint contributions of desirable optical absorption, adaptive energy levels, and appropriate morphology. Herein, two structural analogous polymerized small-molecule acceptors (PSMAs), PYFCl-T PYF&PYCl-T, are synthesized, then incorporated into PM6:PY-IT binary blends to construct ternary all-PSCs. Due superior compatibility PY-IT PYFCl-T, all-PSC based PM6:PY-IT:PYFCl-T with 10 wt% presents higher more balanced charge mobility, suppressed recombination, faster charge-transfer kinetics, resulting in an outstanding power conversion efficiency (PCE) 18.12% enhanced Jsc FF, which is much than that (PCE 16.09%) all-PSCs PM6:PY-IT. Besides, also exhibit improved photostability. The conspicuous performance enhancement principally should give credit miscibility-driven phase optimization donor acceptor. These findings highlight significance polymer-backbone configuration modulation PSMAs morphology toward boosting device properties

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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