An Efficient and Stable Inverted Structure Organic Solar Cell Using ZnO Modified by 2D ZrSe₂ as a Composite Electron Transport Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(37)

Published: April 10, 2024

Abstract As an electron transport layer (ETL) widely used in organic solar cells (OSCs), ZnO has problems with energy level mismatch the active and excessive defects on surface, which can reduce efficiency of OSCs. Here, ZnO/ZrSe 2 composite is fabricated by modifying 2D ZrSe . The XPS first‐principles calculation (FPC) show that obtains electrons from forms interfacial dipoles toward layer, decreases work function ZnO, thus reducing interface barrier favoring collection At same time, after modification, oxygen vacancy density surface decreases, improving conductivity ZnO. More importantly, femtosecond transient absorption (Fs‐TA) shows selectively traps holes prevents entering thereby probability recombination. Finally, as a novel ETL OSCs PBDB‐T: ITIC, PM6:Y6 PM6: L8‐BO layers, obtaining 12.09%, 16.34%, 18.24% efficiency, respectively. This study provides method for modification further investigates role nanosheets modification.

Language: Английский

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Binary All‐polymer Solar Cells with a Perhalogenated‐Thiophene‐Based Solid Additive Surpass 18 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(9)

Published: Jan. 3, 2024

Abstract Morphological control of all‐polymer blends is quintessential yet challenging in fabricating high‐performance organic solar cells. Recently, solid additives (SAs) have been approved to be capable tuning the morphology polymer: small‐molecule improving performance and stability devices. Herein, three perhalogenated thiophenes, which are 3,4‐dibromo‐2,5‐diiodothiophene (SA‐T1), 2,5‐dibromo‐3,4‐diiodothiophene (SA‐T2), 2,3‐dibromo‐4,5‐diiodothiophene (SA‐T3), were adopted as SAs optimize cells (APSCs). For blend PM6 PY‐IT, benefitting from intermolecular interactions between thiophenes polymers, molecular packing properties could finely regulated after introducing these SAs. In situ UV/Vis measurement revealed that assist morphological character evolution blend, leading their optimal morphologies. Compared as‐cast device : all SA‐treated binary devices displayed enhanced power conversion efficiencies 17.4–18.3 % with obviously elevated short‐circuit current densities fill factors. To our knowledge, PCE 18.3 for SA‐T1‐treated ranks highest among APSCs date. Meanwhile, universality SA‐T1 other demonstrated unanimously improved performance. This work provide a new pathway realizing APSCs.

Language: Английский

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Tailoring Cyano Substitutions on Quinoxaline‐based Small‐Molecule Acceptors Enabling Enhanced Molecular Packing for High‐Performance Organic Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)

Published: May 11, 2024

Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new benzo‐quinoxaline core synthesizes two novel A‐DA'D‐A type named BQx‐CN BQx‐2CN, with mono‐ di‐cyanide groups, respectively. Through tailoring number CN BQx‐CN‐based OSC exhibits best device performance 18.8%, significantly higher than non‐cyano BQx‐based one. The reason superior devices can be attributed fine‐tuned level, packing, ideal phase segregation, lead exciton dissociation, faster transport, suppressed recombination, therefore highest fill factor (FF) power conversion efficiencies (PCE). research demonstrates effectiveness SMAs enhanced better OSCs.

Language: Английский

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Device engineering of non-fullerene organic photovoltaics with extrapolated operational T80 lifetime over 45,000 h in air

Joule, Journal Year: 2024, Volume and Issue: 8(8), P. 2250 - 2264

Published: June 12, 2024

Language: Английский

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Polymer Fiber Rigid Network with High Glass Transition Temperature Reinforces Stability of Organic Photovoltaics

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: June 18, 2024

Organic photovoltaics (OPVs) need to overcome limitations such as insufficient thermal stability be commercialized. The reported approaches improve either rely on the development of new materials or tailoring donor/acceptor morphology, however, exhibiting limited applicability. Therefore, it is timely develop an easy method enhance without having donor-acceptor compatibilizers, by introducing another third component. Herein, a unique approach presented, based constructing polymer fiber rigid network with high glass transition temperature (T

Language: Английский

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Solid Additive Dual‐Regulates Spectral Response Enabling High‐Performance Semitransparent Organic Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 30, 2024

Abstract Semi‐transparent organic solar cells (ST‐OSCs) possess significant potential for applications in vehicles and buildings due to their distinctive visual transparency. Conventional device engineering strategies are typically used optimize photon selection utilization at the expense of power conversion efficiency (PCE); moreover, fixed spectral range always imposes an unsatisfactory upper limit its light (LUE). Herein, a novel solid additive named 1,3‐diphenoxybenzene (DB) is employed dual‐regulate donor/acceptor molecular aggregation crystallinity, which effectively broadens response ST‐OSCs near‐infrared region. Besides, more visible allowed pass through devices, enables satisfactory photocurrent high average transmittance (AVT) simultaneously. Consequently, optimal ST‐OSC based on PP2+DB/BTP‐eC9+DB achieves superior LUE 4.77%, representing highest value within AVT 40–50%, also correlates with formation multi‐scale phase‐separated morphology. Such results indicate that can simultaneously meet requirements minimum commercial plant photosynthesis when integrated roofs agricultural greenhouses. This work emphasizes significance additives tune ST‐OSCs, charts way photovoltaics economically sustainable development.

Language: Английский

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Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cells

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

Published: Jan. 29, 2025

Language: Английский

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Vertical Phase Regulation with 1,3,5‐Tribromobenzene Leads to 18.5% Efficiency Binary Organic Solar Cells

Advanced Science, Journal Year: 2023, Volume and Issue: 10(26)

Published: July 9, 2023

The sequential deposition method assists the vertical phase distribution in photoactive layer of organic solar cells, enhancing power conversion efficiencies. With this film coating approach, morphology both layers can be fine-tuned with high boiling solvent additives, as frequently applied one-step casting films. However, introducing liquid additives compromise morphological stability devices due to residuals. Herein, 1,3,5-tribromobenzene (TBB) volatility and low cost, is used a solid additive acceptor solution combined thermal annealing regulate cells composed D18-Cl/L8-BO. Compared control treated TBB those that underwent additional processing exhibit increased exciton generation rate, charge carrier mobility, lifetime, reduced bimolecular recombination. As result, TBB-treated achieve champion efficiency 18.5% (18.1% averaged), one highest efficiencies binary open circuit voltage exceeding 900 mV. This study ascribes advanced device performance gradient-distributed donor-acceptor concentrations direction. findings provide guidelines for optimizing sequentially deposited top high-performance cells.

Language: Английский

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Siloxane-induced robust photoactive materials with high humidity tolerance for ambient processing of organic solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(8), P. 3474 - 3485

Published: Jan. 1, 2023

Photoactive materials comprising a siloxane-terminated side chain could enable active layers with high humidity tolerance and maintain efficiency.

Language: Английский

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Effect of 1‐Fluoro‐2‐iodobenzene Solvent Additive on the Crystallization of Donors and Acceptors, and Ultrafast Carrier Dynamics in Polymer Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(13)

Published: Dec. 15, 2023

Abstract Controlled sequential crystallization of donors and acceptors is a critical factor for achieving enhanced phase separation efficient charge transfer performance in polymer solar cells (PSCs). In this study, comprehensive investigation structurally simple solvent additive, 1‐fluoro‐2‐iodobenzene (OFIB) conducted, which efficiently controls the morphology active layer, resulting fibrous assembly significantly enhancing power conversion efficiency from 16.34% to 18.38% based on PM6:L8‐BO system. Density functional theory, molecular dynamics simulations, grazing incidence small‐ wide‐angle X‐ray scattering techniques reveal that addition OFIB processed blend aligns orientation acceptor molecules, thereby overall π–π stacking layer. establishes nearly equal‐strength interactions with conjugated frameworks both donor materials, benefiting multiple electron conjugation between its iodine atom framework Femtosecond‐timescale photophysical studies demonstrate OFIB‐optimized layer shows reduced exciton losses at donor–acceptor interface. This study offers new perspective mechanism underlying function additives presents research methodology will guide development next‐generation non‐fullerene PSCs.

Language: Английский

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