Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Май 2, 2022

The development of organic solar cells (OSCs) with thick active layers is crucial importance for the roll-to-roll printing large-area panels. Unfortunately, increasing layer thickness usually results in a significant reduction efficiency. Herein, we fabricated efficient thick-film OSCs an consisting one polymer donor and two non-fullerene acceptors. acceptors were found to possess enlarged exciton diffusion length mixed phase, which beneficial generation dissociation. Additionally, by approach was employed optimize vertical phase separation. Benefiting from synergetic effects graded separation, efficiency 17.31% (certified value 16.9%) obtained 300 nm-thick OSC, short-circuit current density 28.36 mA cm-2, high fill factor 73.0%. Moreover, device 500 nm also shows 15.21%. This work provides valuable insights into fabrication layers.

Язык: Английский

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Small-molecular donor guest achieves rigid 18.5% and flexible 15.9% efficiency organic photovoltaic via fine-tuning microstructure morphology

Joule, Год журнала: 2021, Номер 5(9), С. 2395 - 2407

Опубликована: Июль 20, 2021

Язык: Английский

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Progress and prospects of the morphology of non-fullerene acceptor based high-efficiency organic solar cells

Energy & Environmental Science, Год журнала: 2021, Номер 14(8), С. 4341 - 4357

Опубликована: Янв. 1, 2021

This review summarizes the important morphological characteristics and recent research progress of non-fullerene acceptor based organic solar cells, as well provides insights perspectives on this topic.

Язык: Английский

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High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

Science China Chemistry, Год журнала: 2021, Номер 64(7), С. 1192 - 1199

Опубликована: Май 20, 2021

Язык: Английский

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Fibrillization of Non‐Fullerene Acceptors Enables 19% Efficiency Pseudo‐Bulk Heterojunction Organic Solar Cells

Advanced Materials, Год журнала: 2022, Номер 35(6)

Опубликована: Ноя. 24, 2022

The structural order and aggregation of non-fullerene acceptors (NFA) are critical toward light absorption, phase separation, charge transport properties their photovoltaic blends with electron donors, determine the power conversion efficiency (PCE) corresponding organic solar cells (OSCs). In this work, fibrillization small molecular NFA L8-BO assistance fused-ring solvent additive 1-fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dynamics simulations show that FN attaches backbone as bridge enhance intermolecular packing , inducing 1D self-assembly into fine fibrils a compact polycrystal structure. incorporated pseudo-bulk heterojunction (P-BHJ) active layer D18 donor, enhanced transport, collection properties, leading from 16.0% an unprecedented 19.0% in D18/L8-BO binary P-BHJ OSC, featuring high fill factor 80%. This work demonstrates strategy for fibrillating NFAs performance OSCs.

Язык: Английский

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Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Авг. 10, 2021

Abstract Graded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated OSCs deliver outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition crystallinity gradient distributions, which benefit charge transport, thick OSC PCEs (16.25% for 300 nm, 14.37% 500 nm), are among highest reported. Moreover, enabled open-air blade coating achieved a record 16.77% PCE. The blade-coated drastically different D-A crystallization kinetics, suppresses excessive aggregation induced unfavorable BHJ. All these make feasible promising towards highly efficient, eco- manufacture friendly

Язык: Английский

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Ternary Blend Organic Solar Cells: Understanding the Morphology from Recent Progress

Advanced Materials, Год журнала: 2021, Номер 34(46)

Опубликована: Ноя. 19, 2021

Ternary blend organic solar cells (TB-OSCs) incorporating multiple donor and/or acceptor materials into the active layer have emerged as a promising strategy to simultaneously improve overall device parameters for realizing higher performances than binary devices. Whereas introducing also results in more complicated morphology their counterparts. Understanding is crucially important further improving performance of TB-OSC. This review introduces solubility and miscibility that affect ternary blends. Then, this summarizes recent processes study on blends from aspects molecular crystallinity, packing orientation, domain size purity, directly observation morphology, vertical phase separation well morphological stability. Finally, summary prospects TB-OSCs are concluded.

Язык: Английский

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Asymmetric electron acceptor enables highly luminescent organic solar cells with certified efficiency over 18%

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Май 11, 2022

Enhancing the luminescence property without sacrificing charge collection is one key to high-performance organic solar cells (OSCs), while limited by severe non-radiative recombination. Here, we demonstrate efficient OSCs with high via design and synthesis of an asymmetric non-fullerene acceptor, BO-5Cl. Blending BO-5Cl PM6 donor leads a record-high electroluminescence external quantum efficiency 0.1%, which results in low voltage loss 0.178 eV power conversion (PCE) over 15%. Importantly, incorporating as third component into widely-studied donor:acceptor (D:A) blend, PM6:BO-4Cl, allows device displaying certified PCE 18.2%. Our joint experimental theoretical studies unveil that more diverse D:A interfacial conformations formed acceptor induce optimized blend energetics, contributes improved performance balancing generation

Язык: Английский

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Small Exciton Binding Energies Enabling Direct Charge Photogeneration Towards Low‐Driving‐Force Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(28), С. 15348 - 15353

Опубликована: Май 4, 2021

Abstract Organic solar cells (OSCs) with nonfullerene acceptors (NFAs) exhibit efficient charge generation under small interfacial energy offsets, leading to over 18 % efficiency for the single‐junction devices based on state‐of‐the‐art NFA of Y6. Herein, reveal underlying mechanisms, we have investigated exciton binding ( E b ) in Y6 by a joint theoretical and experimental study. The results show that owing strong polarization effects, has remarkable −0.11–0.15 eV, which is even lower than perovskites many cases. Moreover, it peculiar photoluminescence enhanced temperature, barrier separating excitons into charges evidently thermal according temperature dependence photoluminescence, manifesting direct photogeneration carriers enabled weak Thus, NFA‐based OSCs shows little driving forces.

Язык: Английский

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18.4 % Organic Solar Cells Using a High Ionization Energy Self‐Assembled Monolayer as Hole‐Extraction Interlayer

ChemSusChem, Год журнала: 2021, Номер 14(17), С. 3569 - 3578

Опубликована: Апрель 30, 2021

Abstract Self‐assembled monolayers (SAMs) based on Br‐2PACz ([2‐(3,6‐dibromo‐9 H ‐carbazol‐9‐yl)ethyl]phosphonic acid) 2PACz ([2‐(9H‐Carbazol‐9‐yl)ethyl]phosphonic and MeO‐2PACz ([2‐(3,6‐dimethoxy‐9H‐carbazol‐9‐yl)ethyl]phosphonic molecules were investigated as hole‐extracting interlayers in organic photovoltaics (OPVs). The highest occupied molecular orbital (HOMO) energies of these SAMs measured at −6.01 −5.30 eV for MeO‐2PACz, respectively, found to induce significant changes the work function (WF) indium‐tin‐oxide (ITO) electrodes upon chemical functionalization. OPV cells PM6 (poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl‐3‐fluoro)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b’]dithiophene))‐alt‐(5,5‐(1’,3’‐di‐2‐thienyl‐5’,7’‐bis(2‐ethylhexyl)benzo[1’,2’‐c:4’,5’‐c’]dithiophene‐4,8‐dione)]) : BTP‐eC9 PC 71 BM ([6,6]‐phenyl‐C71‐butyric acid methyl ester) using ITO/Br‐2PACz anodes exhibited a maximum power conversion efficiency (PCE) 18.4 %, outperforming devices with ITO/MeO‐2PACz (14.5 %) ITO/poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT PSS) (17.5 %). higher PCE was originate from much WF (−5.81 eV) compared (4.58 ITO/PEDOT PSS (4.9 eV), resulting lower interface resistance, improved hole transport/extraction, trap‐assisted recombination, longer carrier lifetimes. Importantly, electrode chemically stable, after removal SAM it could be recycled reused construct fresh OPVs equally impressive performance.

Язык: Английский

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