Miscibility screening promotes the efficiency and stability of P3HT‐based organic solar cells

Aggregate, Год журнала: 2023, Номер 5(2)

Опубликована: Ноя. 20, 2023

Abstract The power conversion efficiency of organic photovoltaics (OPVs) has witnessed continuous breakthroughs in the past few years, mostly benefiting from extensive use a facile ternary blending strategy by host polymer donor:small molecule acceptor mixture with second small acceptor. Nevertheless, this rather general used well‐known PM6 systems fails constructing high‐performance P3HT‐based OPVs. As result, efficiencies all resulting blends based on benchmark P3HT:ZY‐4Cl and are no more than 8%. Employing mutual miscibility binary as guide to screen acceptor, here we were able break longstanding 10%‐efficiency barrier OPVs P3HT dual nonfullerene acceptors. With rational approach, identified multifunctional BTP‐2Br simultaneously improve photovoltaic performance both PM6‐based Attractively, P3HT:ZY‐4Cl:BTP‐2Br blend exhibited record‐breaking 11.41% for This is first‐ever report that over 11% achieved Importantly, study helps community rely less trial‐and‐error methods solar cells.

Язык: Английский

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Aggregation state tuning via controlling molecular weights of D–A₁–A₂ type polymer donors for efficient organic photovoltaics

Journal of Materials Chemistry A, Год журнала: 2023, Номер 11(13), С. 6997 - 7005

Опубликована: Янв. 1, 2023

A polymer donor with a D–A 1 –A 2 type structure was developed, whose aggregation state tuned by molecular weight control, finally leading to over 15% power conversion efficiency.

Язык: Английский

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Unraveling High Reproducibility and Broad Composition Tolerance in High‐Efficiency Organic Solar Cells via Sequential Deposition

Advanced Energy Materials, Год журнала: 2023, Номер 13(44)

Опубликована: Окт. 8, 2023

Abstract The reproducibility issue is impeding the progress of commercialization in organic photovoltaic (OPV) devices, as difficulty precise micro‐nano structure control bulk heterojunction films, well ineluctable fluctuations molecular weight and polydispersity index synthetic process. Due to such intrinsic properties, poor regioregularity significantly affects batch‐to‐batch variation performance large‐area or integrative scattered OPV devices. Seeking alternatives compensatory strategies expected reduce inevitable problem fabrication Herein, application potential a pseudo‐bilayer high‐performance OPVs, by using solution‐processed method thoroughly examined, it observed that sequentially‐deposited solar cells enjoy improve device addition power conversion efficiency (PCE) enhancement. Importantly, desirable layer‐by‐layer structures raised from film formation process provides new opportunities ternary an improved PCE 18.70% can be achieved PM6/L8‐BO:PY‐IT device, where counterpart cases exhibit decreasing trend with increasing content PY‐IT. This work illustrates spatial effects devices aspect charge carrier transport/transfer, morphology kinetics, novel perspective overcome barriers commercialization.

Язык: Английский

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End‐extended Conjugation Strategy to Reduce the Efficiency‐Stability‐Mechanical Robustness Gap in Binary All‐Polymer Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Окт. 10, 2024

Concurrently achieving high efficiency, mechanical robustness and thermal stability is critical for the commercialization of all-polymer solar cells (APSCs). However, APSCs usually demonstrate complicated morphology, primarily attributed to polymer chain entanglement which has a detrimental effect on their fill factors (FF) morphology stability. To address these concerns, an end-group extended acceptor, PY-NFT, was synthesized studied. The analysis showed tightly ordered molecular packing mode favorable phase separation formed. PM6 : PY-NFT-based device achieved exceptional PCE 19.12 % (certified as 18.45 %), outperforming control PY-FT devices (17.14 %). This significant improvement highlights record-high binary APSCs. aging study revealed that PY-NFT blend exhibited excellent morphological stability, thereby superior retaining 90 initial efficiency after enduring stress (65 °C) 1500 hours. More importantly, film outstanding ductility with crack onset strain 24.1 %. Overall, rational chemical structure innovation, especially conjugation extension strategy trigger appropriate stable key improved robust

Язык: Английский

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Optimizing mechanical stretchability and photovoltaic performance in all-polymer solar cells from a two-donor polymer blend

Chemical Engineering Journal, Год журнала: 2023, Номер 476, С. 146723 - 146723

Опубликована: Окт. 17, 2023

Язык: Английский

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