Polymer-like tetramer acceptor enables stable and 19.75% efficiency binary organic solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 20, 2025

Abstract Limited by large batch differences and inferior polymerization degree of current polymer acceptors, the potential high efficiency stability advantages all-polymer solar cells (all-PSCs) cannot be fully utilized. Alternatively, largely π-extended structurally definite oligomer acceptors are effective strategies to realize overall performance acceptors. Herein, we report a linear tetramer acceptor namely 4Y-BO with identical molecular skeleton comparable molecular-weight relative control PY-BO. The shows refined film-forming kinetics improved ordering, offering uniform crystallinity donor hence well-defined fibrous heterojunction textures. Encouragingly, PM6:4Y-BO devices achieve an up 19.75% (certified efficiency:19.58%), surpassing that PM6:PY-BO device (15.66%) ranks highest among based on More noticeably, thermal stability, photostability mechanical flexibility collectively enhanced for devices. Our study provides important approach fabricating stable organic photovoltaics.

Язык: Английский

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High-performance binary organic solar cells by simultaneously enhancing exciton diffusion and charge transport in small molecule acceptors

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 160740 - 160740

Опубликована: Фев. 1, 2025

Язык: Английский

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Asymmetric small-molecule acceptor enables suppressed electron-vibration coupling and minimized driving force for organic solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 10, 2025

Abstract Minimizing the energy loss, particularly non-radiative loss (Δ E nr ), without sacrificing charge collection efficiency, is key to further improve photovoltaic performance of organic solar cells (OSCs). Herein, we proposed an asymmetric molecular design strategy, via developing alkyl/thienyl hybrid side chain based small molecule acceptors (SMAs) BTP-C11-TBO and BTP-BO-TBO, manipulate intermolecular interactions realize enhanced luminescence efficiency reduced loss. Theoretical experimental results indicate that compared three symmetric SMAs BTP-DC11, BTP-DTBO BTP-DBO, BTP-BO-TBO exhibit repressed electron-vibration coupling Δ . Moreover, nature allows formation multiple D:A interfacial conformations energies, which have made charge-transfer state energies closer strongly absorbing (and emitting) local-exciton state, thus gaining low while maintaining efficient exciton dissociation. Consequently, PM6:BTP-BO-TBO-based OSCs achieve a higher power conversion 19.76%, with high open circuit voltage 0.913 V fill factor 81.17%, profiting from more improved balanced mobility longer carrier lifetime. This work provides ideas suppress nonradiative decay paves way obtain high-performance OSCs.

Язык: Английский

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Medium‐Bandgap Acceptors for Efficient Ternary Organic Solar Cells Achieved by End‐Group Engineering

Solar RRL, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

The ternary strategy has been evidenced as one of the most crucial methods to improve photovoltaic performance organic solar cells. However, selection and design third components are decisive factors facilitating progress cells (TOSCs). In this study, focuses concentrated on D18‐Cl:N3 binary host device by developing a weakly electron‐withdrawing end group synthesizing guest acceptor, BTP‐CM, which holds similar backbone N3. structure resemblance ensures good compatibility molecule with N3, improves charge transport reduces recombination. Thereby, D18‐Cl:N3:BTP‐CM‐based TOSC exhibits an improved power conversion efficiency 18.32%, compared 17.13% device. This work provides effective for acceptors, aims introduce new groups obtain molecules complementary absorptions matched energy levels while preserving molecular acceptor.

Язык: Английский

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Fluorine/bromine/selenium multi-heteroatoms substituted dual-asymmetric electron acceptors for o-xylene processed organic solar cells with 19.12% efficiency

Science China Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Abstract The development of high-performance near-infrared (NIR) absorbing electron acceptors is a major challenge in achieving high short-circuit current density ( J SC ) to increase power conversion efficiency (PCE) organic solar cells (OSCs). Herein, three new multi-heteroatomized Y-series (bi-asy-Y-Br, bi-asy-Y-FBr, and bi-asy-Y-FBrF) were developed by combining dual-asymmetric selenium-fused core brominated end-groups with different numbers fluorine substitutions. With gradually increasing fluorination, exhibit red-shift absorption. Among them, bi-asy-Y-FBrF presents planar molecular geometry, the maximum average electrostatic potential, minimum dipole moment, which are conducive intramolecular packing charge transport. Moreover, D18:bi-asy-Y-FBrF active layer higher crystallinity, more suitable phase separation, reduced recombination compared D18:bi-asy-Y-Br D18:bi-asy-Y-FBr blends. Consequently, among theses binary OSCs, device achieves PCE 15.74% an enhanced 26.28 mA cm −2 , while obtains moderate 15.04% highest open-circuit voltage V OC 0.926 V. Inspired its complementary absorption NIR-absorbing BTP-eC9 as acceptor, bi-asy-Y-Br introduced into D18:BTP-eC9 construct ternary further boosted 19.12%, top values for reported green solvent processed OSCs.

Язык: Английский

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Dimeric Acceptors Using Different Central Linkers to Manipulate Electronic and Morphological Properties

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Abstract Dimerized acceptors show promise in combining the high performance of small‐molecule non‐fullerene (NFAs) with excellent stability polymer acceptors. The central linking units that connect two acceptor molecules together have a profound impact on dimeric properties and structure‐performance relationships blended thin films. It is seen different linkers significantly affect electronic morphology film. electron‐donating linker elevates absorption coefficient, affords lower bandgap, reduces energy loss, thus better photovoltaic device performance. Better fibrillar can be obtained. best material DY‐EDOT‐based shows power conversion efficiency (PCE) 18.21%, an open‐circuit voltage ( V oc ) 0.924 V, short‐circuit current density J sc 25.20 mA cm −2 , fill factor (FF) 78.19%, which among highest value for dimerized This study reveals fundamental importance determining provides useful strategies developing oligomeric polymeric acceptors, critical simultaneously improving organic solar cells (OSCs).

Язык: Английский

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Highly Crystalline Selenium‐Substituted C‐Shaped Ortho‐Benzodipyrrole‐Based A‐D‐A‐Type Nonfullerene Acceptor Enabling Solution‐Processed Single‐Crystal‐Like Thin Films for Air‐Stable, High‐Mobility N‐Type Transistors

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 20, 2024

Abstract C‐shaped ortho ‐benzodipyrrole‐based A‐D N B D‐A non‐fullerene acceptors (NFAs), derived from the removal of A′ thiadiazole moiety in Y6, emerge as a new class structurally simplified A‐D‐A‐type NFAs. In this work, selenium‐substitution strategy is applied to central D ladder‐π‐core, yielding asymmetric CB‐Se and symmetric CB‐2Se. Asymmetric demonstrates less ordered 3D trapezoid‐like packing structure, which promotes more favorable intermixed donor‐acceptor morphology with PM6 polymer, achieving higher power conversion efficiency (PCE) 17.87% organic photovoltaics (OPVs). This value represents highest reported among selenium‐incorporated Symmetric CB‐2Se forms kaleidoscope‐like single‐crystal structure enhanced intermolecular interactions. enables development single‐crystal‐like solution‐processed thin film, transitions kinetically trapped face‐on π–π stacking orientation thermodynamically stable edge‐on configuration upon thermal annealing. The CB‐2Se‐based field‐effect transistor (OFET) achieved remarkable electron mobility 1.18 cm 2 V −1 s exceptional n‐type air stability, outperformed corresponding D‐A‐type Y6‐based materials by two orders magnitudes for OFETs utilizing small molecules.

Язык: Английский

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Subtly Modulating Bay Sites of Perylene Diimide Cathode Interface Layer for High‐Performance and High‐Stability Non‐Fullerene Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 26, 2024

Abstract Cathode interface layers (CILs) are crucial for optimizing the power conversion efficiency (PCE) and stability of organic solar cells (OSCs). Two small molecule CILs, PDINN‐TS PDINN‐BS developed, by modifying bay sites perylene diimide (PDI) with thieno [3,2‐b] thiophene 2,2′‐bithiophene, separately. Due to better electron‐donating capacity longer conjugate length exhibits a stronger self‐doping effect superior compatibility compared PDINN‐TS. Consequently, in PM6: Y6 OSCs, achieved an elevated PCE 16.95%, surpassing 16.66%. Meanwhile, excellent universality. When employing BTP‐eC9 PM6:L8‐BO systems, PDINN‐BS‐based device yielded 18.02% 18.95%, outperforming 17.51% 18.38%, respectively. Furthermore, tests revealed that after being stored glovebox 1500 h, retained 90% its pristine PCE, 86% showed 80% decay (T 80 ) 150 h air, 200 at 70 °C heating N 2 , 500 under 1 sun immersion, 120, 130, 380 This demonstrates displayed complicated environment. this study provides significative guidance exploitation high‐performance high‐stability OSCs.

Язык: Английский

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The Pseudo-Bilayer Bulk Heterojunction Active Layer of Polymer Solar Cells in Green Solvent with 18.48% Efficiency

Polymers, Год журнала: 2025, Номер 17(3), С. 284 - 284

Опубликована: Янв. 22, 2025

Planar heterojunction (PHJ) is employed to obtain proper vertical phase separation for highly efficient polymer solar cells (PSCs). However, it heavily relies on the choice of orthogonal solvent in production process. Here, we fabricated a pseudo-bilayer bulk (PBHJ) PSC with cross-distribution direction by preparing two layers PM6 and BTP-eC9 blends an o-XY solution different dilution ratios study morphological evolution PBHJ film. We found that film exhibits more uniform suitable continuous interpenetrating network morphology formation p-i-n structure. This provides effective channel exciton dissociation charge transport, which confirmed both generation simulations dynamics measurements. The devices can effectively inhibit trap recombination accelerate transfer. Based good active layer balanced mobility, all-green solvent-processed PSCs champion power conversion efficiencies (PCEs) 18.48% 16.83% are obtained PM6:BTP-eC9 PTQ10:BTP-eC9 systems, respectively. work reveals potential mechanism induced structure alternative approach developing processing PSCs.

Язык: Английский

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Efficient SWIR Organic Photodetectors with Spectral Detection Extending to 1.4 µm Using a Benzobisthiadiazole‐Based Acceptor

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Abstract Organic photodetectors (OPDs) offer significant advantages in biomedical applications, including medical imaging, heart rate monitoring, and tumor therapy. Despite advancements OPD technology, the efficiency of these devices short‐wave infrared (SWIR) region remains considerably lower than that inorganic semiconductors. To tackle this challenge, study developed an ultra‐narrow bandgap acceptor CS‐1, featuring A‐D‐A 1 ‐D‐A structure where benzobisthiadiazole (BBT) serves as electron‐deficient unit A , which exhibits a wide absorption range from 300 to 1550 nm. This molecular design not only enhances properties material but also improves overall performance device. It is worth noting optimal PTB7‐Th:CS‐1 device realizes specific detectivity (D n * ) 2.96 × 10 Jones at 1.30 µm, making it one most efficient wavelength date. Additionally, demonstrates high linear dynamic (LDR) 91.9 dB even 1300 These results indicate significantly detection SWIR region, surpassing commercially available silicon‐based photodetectors. highlights potential BBT for achieving high‐performance OPDs.

Язык: Английский

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