Bisphosphonate‐Anchored Self‐Assembled Molecules with Larger Dipole Moments for Efficient Inverted Perovskite Solar Cells with Excellent Stability

Advanced Materials, Год журнала: 2024, Номер 36(28)

Опубликована: Май 20, 2024

Abstract In the fabrication of inverted perovskite solar cells (PSCs), wettability, adsorbability, and compactness self‐assembled monolayers (SAMs) on conductive substrates have critical impacts quality films defects at buried perovskite‐substrate interface, which control efficiency stability devices. Herein, three bisphosphonate‐anchored indolocarbazole (IDCz)‐derived SAMs, IDCz‐1, IDCz‐2, IDCz‐3, are designed synthesized by modulating position two nitrogen atoms IDCz unit to improve molecular dipole moments strengthen π–π interactions. Regulating work functions (WF) FTO electrodes through energy levels, band bends upwards with a small offset for ITO/IDCz‐3/perovskite, thereby promoting hole extraction blocking electrons. As result, PSC employing IDCz‐3 as hole‐collecting layer exhibits champion PCE 25.15%, is record multipodal SAMs‐based PSCs. Moreover, unencapsulated device can be stored least 1800 h little degradation in performance.

Язык: Английский

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Advances in Stretchable Organic Photovoltaics: Flexible Transparent Electrodes and Deformable Active Layer Design

Advanced Materials, Год журнала: 2024, Номер 36(37)

Опубликована: Май 30, 2024

Stretchable organic photovoltaics (OPVs) have attracted significant attention as promising power sources for wearable electronic systems owing to their superior robustness under repetitive tensile strains and good compatibility. However, reconciling a high power-conversion efficiency reasonable flexibility is tremendous challenge. In addition, the development of stretchable OPVs must be accelerated satisfy increasing requirements niche markets mechanical robustness. OPV devices can classified either structurally or intrinsically stretchable. This work reviews recent advances in OPVs, including design mechanically robust transparent electrodes, photovoltaic materials, devices. Initially, an overview characteristics research progress areas provided. Subsequently, into flexible electrodes that directly affect performances summarized analyzed. Overall, this review aims provide in-depth understanding intrinsic properties highly efficient deformable active while also emphasizing advanced strategies simultaneously improving performance layer, material design, multi-component settings, structural optimization.

Язык: Английский

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Low‐Volatility Fused‐Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 12, 2025

Abstract Volatile solid additives (VSAs) with single or fused‐ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms high‐volatility single‐ring been well studied, influence low‐volatility VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6‐dibromothieno[3,2‐b]thiophene (3,6TTBr) is selected as a representative VSA to elucidate its mechanism. Via theoretical experimental joint investigation, it found that rigid planar 3,6TTBr molecules adsorb onto terminal units L8‐BO (acceptor), inducing loose space adjacent molecules. The thus favors center‐terminal packing larger interfragment distance, which relieves over‐aggregation induces ordered packing. Consequently, treatment reduces aggregation‐caused quenching, photoluminescence quantum yield exciton lifetime film. combination above properties reduced trap density improved carrier transport in 3,6TTBr‐treated devices contributed PCE 20.1%. To validate broad applicability findings, 1,5‐dibromonaphthalene (1,5‐BN), another solid, explored. 1,5‐BN achieved an impressive 20.5%, verifying validity strategy boosting OSC performances.

Язык: Английский

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Achieving 19.72% Efficiency in Ternary Organic Solar Cells through Electrostatic Potential‐Driven Morphology Control

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 9, 2024

Abstract The ternary strategy has proven effective in enhancing the performance of organic solar cells (OSCs), yet identifying optimal third component remains a challenge due to lack theoretical frameworks for predicting its impact based on molecular structure. This study addresses this by proposing quantitative parameters derived from surface electrostatic potential (ESP) as criteria selecting components. asymmetric acceptor BTP‐OS, which exhibits lower total average ESP and larger polarization index relative host acceptor, is introduced into PM6:L8‐BO system. incorporation led weakened ESP‐induced intermolecular interactions reduce miscibility with donor polymer, resulting an optimized multi‐scale morphology blend. Consequently, device achieved efficiency 19.72%, one highest values PM6:L8‐BO‐based devices, enhanced exciton dissociation charge collection, energy disorder, minimized non‐radiative losses. Comparable improvements are also verified PM6:BTP‐eC9 D18:N3 systems, demonstrating broad applicability proposed approach. not only provides practical principle components but establishes broader framework optimizing OSCs, potentially advancing development more efficient OSCs across diverse material systems.

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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An asymmetric polymerized small molecular acceptor with temperature-dependent aggregation and superior batch-to-batch reproducibility for efficient all-polymer solar cells

Nano Energy, Год журнала: 2024, Номер 128, С. 109874 - 109874

Опубликована: Июнь 15, 2024

Язык: Английский

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U‐Shaped Dimeric Acceptors for Balancing Efficiency and Stability in Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 27, 2024

Abstract Despite significant improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs), achieving excellent stability remains a great challenge to their commercial feasibility. Here, U ‐shaped dimeric acceptors (5‐IDT and 6‐IDT) with different molecular lengths are introduced into the binary OSCs as third component, respectively. The introduction component effectively reduces energetic disorder non‐radiative voltage losses improves exciton dissociation charge transport devices. Consequently, PCEs 6‐IDT‐ 5‐IDT‐treated significantly improved 19.32% 19.96%, respectively, which is highest PCE for oligomeric acceptors‐based ternary date. Meanwhile, thermal treated devices dramatically improved, initial efficiency retention increasing from 18% 32% 75%, after 1000 h stress. This mainly attributed ability smaller length 5‐IDT stabilize phase‐separated morphology polymeric donor small acceptor, rather than high glass transition temperature low diffusion coefficient.

Язык: Английский

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Dipole Moment Modulation of Terminal Groups Enables Asymmetric Acceptors Featuring Medium Bandgap for Efficient and Stable Ternary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(3)

Опубликована: Сен. 9, 2024

Abstract This study puts forth a novel terminal group design to develop medium‐band gap Y‐series acceptors beyond conventional side‐chain engineering. We focused on the strategical integration of an electron‐donating methoxy and electron‐withdrawing halogen atom at benzene‐fused groups. combination precisely modulated dipole moment electron density groups, effectively attenuating intramolecular charge transfer effect, widening band acceptors. The incorporation these groups yielded two asymmetric acceptors, named BTP‐2FClO BTP‐2FBrO, both which exhibited open‐circuit voltage ( V oc ) as high 0.96 in binary devices, representing highest OC s among small molecule More importantly, BTP‐2FBrO exhibit modest aggregation behaviors molecular crystallinity, making them suitable third component mitigate excess PM6 : BTP‐eC9 blend optimize devices’ morphology. As result, optimized BTP‐2FClO‐based ternary organic solar cells (OSCs) achieved remarkable power conversion efficiency (PCE) 19.34 %, positioning it highest‐performing OSCs. Our highlights importance manipulating moments developing offers highly efficient for high‐performance

Язык: Английский

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In Situ Morphology Control for Solution‐Printable Organic Photovoltaics

Advanced Functional Materials, Год журнала: 2024, Номер 34(49)

Опубликована: Авг. 27, 2024

Abstract The morphology of the photoactive layer plays an important role in both photoelectric effect and device performance solution‐processed organic solar cells (OSCs). Optimizing requires precise control over complex film formation kinetics, which are influenced by a range factors from solution state to solid‐film state. This review delves into situ characterization technologies employed understand active process explores strategies for controlling during key stages, including aggregation, nucleation, crystal growth, phase separation. Special attention is given mechanism these enable real‐time printing their potential facilitate direct layers with optimized morphology. goal offer valuable insights guidance managing kinetics OSCs, ultimately addressing challenges scale‐up paving way high‐throughput production post‐processing‐free devices.

Язык: Английский

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Controllable Heavy n‐type Behaviours in Inverted Perovskite Solar Cells with Non‐Conjugated Passivants

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

Опубликована: Ноя. 2, 2024

Abstract Interfacial issues between the perovskite film and electron transport layer greatly limit efficiency stability of inverted ( p‐i‐n ) solar cells (PSCs). Despite organic ammonium passivants have been widely established as interfacial layers, they failed to improve extraction. Here, we reported that heavy n‐type characteristics in a low band gap could be modulated by incorporating non‐conjugated with strong electron‐withdrawing abilities. This resulted significant enhancement extraction heavily n ‐type doped perovskite. The passivant‐treated PSCs exhibited power conversion 25.74 % an excellent fill factor 85.4 high open‐circuit voltage 1.166 V, which are significantly higher than control device. unencapsulated devices maintained 88 their initial PCEs after 1,200 hours at 85 °C.

Язык: Английский

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