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

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: May 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.

Language: Английский

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

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(37)

Published: May 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.

Language: Английский

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

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 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.

Language: 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, Journal Year: 2024, Volume and Issue: 64(3)

Published: Sept. 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

Language: Английский

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1,4-Dimethoxynaphthalene as a Solid Additive for Improved Photovoltaic Performance in Organic Solar Cells

ACS Applied Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Morphology optimization of blend films is an essential strategy to enhance the photovoltaic performance organic solar cells (OSCs). Additive engineering effective for fine-tuning active layer morphology. Given limited efforts and achievements in designing synthesizing liquid additives, new solid additives manipulate morphology layers have gained widespread attention. Herein, 1,4-dimethoxynaphthalene (DMNA), with merits simple structure, low cost, ecofriendliness, successfully incorporated as a novel additive optimize OSCs based on D18-Cl:N3. The relationship between different DMNA contents device has been investigated. It found that can be effectively regulated by DMNA, leading enhanced molecular packing films, which favors exciton dissociation, charge transfer, suppression recombination. As result, 18.61% power conversion efficiency (PCE) obtained D18-Cl:N3 binary devices better than 17.21% PCE control device. This primarily due simultaneous increase short-circuit current density fill factor. Furthermore, general applicability confirmed other systems. These results suggest presents potential prospects regulating bulk heterojunction toward high-performance high-stability OSCs.

Language: 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, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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.

Language: Английский

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Strategies and Mechanisms To Minimize Energy Loss in Non-Fullerene Bulk Heterojunction Organic Solar Cells: Experimental and Computational Approaches

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Language: Английский

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Manipulating Molecular Stacking for Semitransparent Organic Photovoltaics Achieving Light Utilization Efficiency >6%

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract The trade‐off between average visible transmittance (AVT) and power conversion efficiency (PCE), governed by the molecular stacking of donor acceptor materials in semitransparent organic solar cells (ST‐OSCs), significantly constrains improvements light utilization (LUE). Here, simultaneous enhancement AVT PCE is achieved meticulously designing host‐guest active layers to fine‐tune stacking. A systematic investigation various host guest material combinations reveals that (D18) with more electron‐deficient hydrogen atoms tends form C─H···O interactions (BTO‐BO) features electron‐rich oxygen atoms. Hydrogen bonding D18 BTO‐BO facilitate transition from mixed J ‐type H modes predominant during crystallization, reducing absorption enhancing hole transport. Additionally, can act as a nucleation agent for BTP‐eC9 increase crystallinity coefficient layer, thereby, near‐infrared absorption. resultant toluene‐processed ST‐OSCs optical modulation exhibit improvement AVT, delivering record LUEs 6.02%. Notably, this layer demonstrates exceptional compatibility flexible devices promising scalability greenhouse photovoltaic applications.

Language: Английский

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

Solar RRL, Journal Year: 2025, Volume and Issue: unknown

Published: March 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.

Language: Английский

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High Efficiency Non‐Halogenated Solvent Processed Organic Solar Cells Through Synergistic Effects of Layer‐by‐Layer and Solid Additive

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Abstract In the field of organic solar cells (OSCs), bulk heterojunction (BHJ) structure is most widely used. On contrary, layer‐by‐layer (LBL) gives a p‐i‐n separation where donor close to transparent electrode while acceptor reflective electrode, which shows be an ideal for OSCs. this work, volatile solid additives 2,5‐dibromoprazine (DBP) and 2‐bromine‐5‐iodopyrazine (BIP) are introduced regulate morphology LBL active layers. Comprehensive analysis reveals that DBP BIP can promote stronger molecular packing crystallinity BTP‐eC9, resulting in higher charge mobility, more efficient separation, suppressed bimolecular recombination significantly improve device filling factor (FF), especially devices. Consequently, by combining engineering additive BIP, outstanding power conversion efficiency (PCE) 19.63% based on PM1/BTP‐eC9 achieved further applied PM1/BTP‐eC9:eC9‐2Cl ternary system, PCE exceeded 20%. The results provide comprehensive insights into synergistic effect high‐performance photovoltaics.

Language: Английский

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