21.15%‐Efficiency and Stable γ ‐CsPbI₃ Perovskite Solar Cells Enabled by an Acyloin Ligand

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(12)

Published: Jan. 9, 2023

Cesium lead triiodide (CsPbI3 ) is a promising light-absorbing material for constructing perovskite solar cells (PSCs) owing to its favorable bandgap and thermal tolerance. However, the high density of defects in CsPbI3 film not only act as recombination centers, but also facilitate ion migration, leading lower PCE inferior stability compared with state-of-the-art organic-inorganic hybrid PSC counterpart. Theoretical analyses suggest that effective suppression helpful improving device performance. Herein, stable efficient γ -CsPbI3 PSCs are demonstrated by developing an acyloin ligand (1,2-di(thiophen-2-yl)ethane-1,2-dione (DED)) phase stabilizer defect passivator. The experiment calculation results confirm carbonyl thienyl DED can synergistically interact forming chelate effectively passivate Pb-related further suppress migration. Consequently, DED-treated yield champion 21.15%, which one highest among all reported date. In addition, unencapsulated DED-CsPbI3 retain 94.9% itsinitial when stored under ambient conditions 1000 h 92.8% initial constant illumination 250 h.

Language: Английский

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Stabilization of Perovskite Lattice and Suppression of Sn²⁺/Sn⁴⁺ Oxidation via Formamidine Acetate for High Efficiency Tin Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(17)

Published: Jan. 31, 2023

Abstract Tin halide lead‐free perovskite solar cells (TPSCs) have received tremendous research interest recently due to their nearly ideal bandgap, broad light absorption, non‐toxicity, and environmental friendliness. However, the uncontrollable crystallization process facile oxidation of Sn 2+ limit further increase power conversion efficiency (PCE). To solve these problems, a series acetates are introduced into precursor solution regulate process. It is revealed that formamidine acetate (FAAc) has strong COSn coordination with compared acetic acid (HAc) methylammonium (MAAc), which can stabilize lattice structure, minimize defect states suppress . Meanwhile, benefiting from this ability, it not only leads large‐size colloidal clusters in but also slows down improves crystallinity tin films. The device FAAc achieved an increased PCE initially 9.84% 12.43%, could maintain 94% its initial value for 2000 h N 2 atmosphere. This work provides feasible strategy depositing high‐quality films low density distortion, will be crucial related photovoltaics other optoelectronic devices.

Language: Английский

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What Matters for the Charge Transport of 2D Perovskites?

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(31)

Published: May 23, 2024

Compared to 3D perovskites, 2D perovskites exhibit excellent stability, structural diversity, and tunable bandgaps, making them highly promising for applications in solar cells, light-emitting diodes, photodetectors. However, the trade-off worse charge transport is a critical issue that needs be addressed. This comprehensive review first discusses structure of metal halide then summarizes significant factors influencing detail provides brief overview testing methods. Subsequently, various strategies improve are presented, including tuning A'-site organic spacer cations, A-site B-site X-site ions. Finally, an outlook on future development improving perovskites' discussed.

Language: Английский

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Synergetic Passivation of Metal‐Halide Perovskite with Fluorinated Phenmethylammonium toward Efficient Solar Cells and Modules

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 13(8)

Published: Dec. 30, 2022

Abstract Surface passivation with organic halide salts is a powerful strategy to enhance the performance of perovskite solar cells. However, inevitable formed in‐plane favored two‐dimensional layers low carrier mobility and high binding energy inhibit interfacial charge transfer within device. Herein, bulky fluorinated phenmethylammonium salt designed synthesized passivate film without forming 2D perovskites. A strong interaction which induced by an electron donation from agent not only reduces defects at top surface perovskite, but also suppresses recombination reaction buried due permeation salt. Moreover, results time resolved photoluminescence confocal microscopy images suggest that speed uniformity are enhanced. As result, efficiency small‐area device increases 20.7 ± 0.9% 22.8 0.4% (aperture: 0.16 cm 2 ). stabilized 18.0% 10.0 ) achieved for larger‐area modules 6‐series connected sub‐cells. Equally important, non‐encapsulated show significantly improved stability ambient conditions (ISOS‐D‐1). These significant improvements provided simple reproducible procedure can be readily adopted in other types devices.

Language: Английский

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Recent progress on solar blind deep ultraviolet photodetectors based on metal halide perovskites

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(21), P. 7497 - 7512

Published: Jan. 1, 2024

This review introduced the research progress and present situation of solar blind detectors based on metal halide perovskite (MHP) in recent years from different dimensions: three-dimensional, two-dimensional, one-dimensional zero dimensional.

Language: Английский

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Electron Acceptor Molecule Doping Induced π–π Interaction to Promote Charge Transport Kinetics for Efficient and Stable 2D/3D Perovskite Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(26)

Published: April 26, 2023

Although the incorporation of 2D perovskite into 3D can greatly enhance intrinsic stability, power conversion efficiency (PCE) 2D/3D is still inferior to its counterpart due poor carrier transport kinetics resulted from quantum and dielectric confinement component. To overcome this issue, electron acceptor molecule 1,2,4,5-tetracyanobenzene (TCNB) was introduced trigger intermolecular π-π interaction in along with electronic doping improve charge transfer efficiency. By virtue high affinity, TCNB undergo reaction subsequently establish 1-naphthalenemethylammonium (NMA) cations, strengthening lattice rigidity reducing exciton binding energy. Transmission microscopy results demonstrate that phases are mainly distributed at grain boundaries, defect density weakening nonradiative recombination. Meanwhile, p-type by optimizes energy level alignment perovskite/hole layer interface. Consequently, PCE champion device significantly boosted 24.01 %. The unencapsulated retains an initial close 94 % after exposure ambient environment for over 1000 h. This work paves a novel path designing new mixed-dimensional solar cells superior stability.

Language: Английский

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Perovskite solar cells with self-disintegrating seeds deliver an 83.64% fill factor

Nano Energy, Journal Year: 2024, Volume and Issue: 127, P. 109751 - 109751

Published: May 20, 2024

Language: Английский

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High‐Performance Nanogap Photodetectors Based on 2D Halide Perovskites with a Novel Spacer Cation

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

Published: July 5, 2024

Abstract 2D Ruddlesden─Popper (RP) halide perovskites are attracting increasing research interest due to their enhanced stability compared 3D perovskites. However, the quantum confinement effect of bulk organic spacers hinders separation and transport photo‐generated carriers. Here, a multiple aromatic ring spacer, 3‐benzothiophene methylammonium (BTMA), is developed for new RP perovskite. The BTMA spacer demonstrated, with significant dipole moment, can impair influence effect, presence S atoms or thiophene favorable enhancing interaction between inorganic sheets, improving perovskite photodetector as displays higher device performance than control sample 1‐naphthalene (NMA) spacers. Importantly, outstanding BTMA‐based films devices also confirmed under moisture, heat, illumination conditions. Combining asymmetric coplanar nanogap electrode architecture, photodetectors' responsivity, detectivity, external efficiency 314 A W −1 , 3.4 × 10 13 Jones, 865%, respectively, demonstrated. photodetectors display promising self‐power characteristics, which makes them attractive numerous energy‐efficient applications. work highlights route toward developing high‐performance perovskite‐based excellent long‐term stability.

Language: Английский

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Structural Tailoring the Phenylenediamine Isomers to Obtain 2D Dion–Jacobson Tin Perovskite Solar Cells with Record Efficiency

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(12)

Published: Dec. 14, 2023

Abstract 2D Dion–Jacobson (DJ) tin halide perovskite shows impressive stability by introducing diamine organic spacer. However, due to the dielectric confinement and uncontrollable crystallization process, DJ usually exhibits large exciton binding energy poor film quality, resulting in unfavorable charge dissociation, carrier transport device performance. Here, ortho ‐, meta para ‐isomers of phenylenediamine (PDA) are designed for perovskites. Theoretical simulation experimental characterizations demonstrate that compared with p ‐PDA m ‐PDA, o larger dipole moment, which further reduces Besides, there is a strong hydrogen bond interaction between cation inorganic octahedron, not only improves structural stability, but also induces aggregates precursor form dense uniform high‐quality films, strengthens antioxidant barrier. More interestingly, femtosecond transient absorption proves spacers can reduce small n‐phases, sufficient effective transfer different n‐value. As result, ( ‐PDA)FA 3 Sn 4 I 13 solar cells achieve record power conversion efficiency 7.18%. The study furnishes an method optimize performance tailoring chemical structure spacers.

Language: Английский

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Regulating the Crystallization and Carrier Dynamics for High-Performance Quasi-2D Tin Perovskite Solar Cells

ACS Materials Letters, Journal Year: 2023, Volume and Issue: 5(12), P. 3203 - 3211

Published: Nov. 6, 2023

Compared with three-dimensional (3D) tin halide perovskite, quasi-two-dimensional (2D) perovskite shows high stability and low defect density by introducing bulky organic spacers, which is beneficial to realize efficient stable solar cells (TPSCs). However, the competitive growth between low-dimensional structures leads a complex uncontrollable crystallization process, thus leading random orientation, disordered structure, poor carrier dynamics in corresponding devices. Here, we proposed gradient thermal annealing (GTA) deposit high-quality films structure controlling crystal process. Femtosecond transient absorptions confirmed that this strategy can adjust speed of perovskites different dimensions, reduce proportion small n-phases tend grow parallel substrate. This further facilitated charge transfer enhanced transport extraction. As result, power conversion efficiency (PCE) quasi-2D (⟨n⟩ = 10) Ruddlesden–Popper (RP) TPSCs was increased from 9.14% 12.05% strengthened environmental stability. Notably, approach also applicable both RP Dion-Jacobson (DJ) TPSCs, provides method regulating transport.

Language: Английский

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