Self‐Assembled Charge Bridge Path at the Sn‐Pb Perovskite/C₆₀ Interface for High‐Efficiency All‐Perovskite Tandem Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 31, 2025

Narrow bandgap mixed tin-lead perovskite solar cells (PSCs) have garnered substantial research interest owing to their remarkable optoelectronic properties. However, non-radiative recombination and carrier transport losses at the interface between layer charge (C60) significantly reduce overall efficiency of PSCs. To address this challenge, 9-Fluorenylmethyl carbazate (9FC) is incorporated C60. The hydrazide group present in 9FC effectively mitigates oxidation Sn2+. Furthermore, can engage chemical bonding with perovskite, while outward-facing aromatic rings create effective π-π interactions C60, thereby promoting enhanced interfacial transfer. highest-performing PSCs achieve a power conversion (PCE) 23.97%, accompanied by an impressive open-circuit voltage 0.91 V. Additionally, these facilitate development highly efficient two-terminal four-terminal all-perovskite tandem cells, which demonstrate efficiencies 27.01% 28.07%, respectively.

Язык: Английский

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Synergistic Treatments of Bulk and Surface in Tin‐Lead Mixed Perovskite for Efficient All‐Perovskite Tandem Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 12, 2024

Abstract Narrow‐bandgap (NBG) perovskites have attracted significant attention for their promising potential as light‐absorbing materials in tandem solar cells. However, tin‐lead mixed face a major limitation of the facile oxidation Sn 2 ⁺, leading to vacancies perovskite films. In this study, sodium triacetoxyborohydride (STAB) is introduced an antioxidant, while potassium (5‐bromo‐2‐fluoropyridin‐3‐yl)trifluoroborate (PBFT) employed surface modifier perovskites. This combined approach not only suppresses ⁺ but also promotes formation high‐quality Furthermore, induced energy band bending at perovskite/C 60 interface substantially enhances charge transfer. Consequently, optimized device achieves power conversion efficiency (PCE) 23.41% with excellent illumination stability. When paired wide‐bandgap (WBG) semi‐transparent cell (PSC), resulting four‐terminal (4‐T) all‐perovskite attains remarkable 27.37%.

Язык: Английский

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Inhibiting Ion Migration in Strontium-Lead Halide Perovsikte for Pure Blue Emission: A First Principles and Experiment Study

Optics Letters, Год журнала: 2025, Номер 50(3), С. 1029 - 1029

Опубликована: Янв. 7, 2025

Bromide–chloride mixed perovskites have garnered significant attention as a direct and efficient material for achieving pure-blue emission. However, the complex problem of halide migration in presents obstacle to stable electroluminescence (EL) spectra. Here, we investigate mechanism partially replacing B-site Pb 2+ with non-toxic Sr achieve emission based on first principles. The ion mobility activation energy is 1.23 eV, which an order magnitude greater than that halogens. Meanwhile, incorporation triples halogen migration. Furthermore, defect formation increases from 4.75 eV 5.62 thereby reducing channels. Transient absorption spectroscopy demonstrates suppressing pathway enhancing promotes perovskite film exhibit excellent spectral stability under laser pumping. Our work provides insights development highly eco-friendly devices.

Язык: Английский

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Self‐Induced A‐B‐A Structure Enables Efficient Wide‐Bandgap Perovskite Solar Cells and Tandems

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Wide-bandgap (WBG) perovskite solar cells (PSCs), due to their tunable bandgap, can be integrated into tandem cell configurations with narrow-bandgap overcome the shockley-queisser (SQ) limitation. However, main obstacles limiting performance are poor crystallinity and light-induced halide segregation. To achieve high in WBG PSCs, this study reports a dual-molecule cooperative strategy involving introduction of 1-benzyl-3-methylimidazolium bromide (BzMIM Br) as an additive 6-fluoropyrimidine-2,4- diamine (DMFP) passivation layer. DMFP self-induced penetration bottom perovskite, forming A-B-A structure BzMIM Br, through utilizing multisite integration uncoordinated Pb2+, constructing internal molecular bridges. Research findings indicate that uniform potential distribution interact step-like manner, suppressing segregation, replenishing vacancy defects. Results demonstrate power conversion efficiencies (PCEs) 22.77% 18.54% for inverted PSCs effective areas 0.043 1.0 cm2, respectively. Unencapsulated devices retain 95% initial efficiency after 1500 h continuous illumination under one-sun equivalent conditions nitrogen atmosphere. Additionally, PCE prepared semi-transparent reached 19.60%, while 4-terminal all-perovskite device 26.18%.

Язык: Английский

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Customized Multifunctional Additive Regulates 1.67 eV‐Wide‐Bandgap Perovskite Crystallization for Four‐Terminal Perovskite/Silicon Tandem Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 8, 2025

Abstract Wide‐bandgap (WBG) perovskite solar cells (PSCs, E g > 1.6 eV), serving as the top cell in perovskite/silicon tandem (PSTSCs), play an indispensable role absorbing high energy photons and increasing overall efficiency. However, WBG PSCs often suffer from severe light‐induced phase segregation significant non‐radiative recombination losses due to uncontrolled rapid crystallization. Here, polyfluoride molecular additives are designed incorporated via (diacetoxyiodo)benzene into perovskite, regulate crystallization process of films thereby reduce defects. (Bis(trifluoroacetoxy)iodo)benzene (BTFIB) can passivate uncoordinated lead ions iodide vacancies, inhibiting separation caused by migration reducing loss during charge transport. Moreover, introduction BTFIB effectively moderate film formation confer excellent hydrophobic properties films. Consequently, BTFIB‐based 1.67 eV‐WBG devices yield a champion efficiency 23.05% (certified 22.21%), enabling 31.20% four‐terminal PSTSCs, along with open‐circuit voltage 1.246 V fill factor 85.34%. After 2500 h aging glovebox, device retained 80% its initial

Язык: Английский

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Molecular Bridging at Buried Interface Enables Efficient Wide‐Bandgap Perovskite Solar Cells

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 8, 2025

Abstract The regulation of buried interface is crucial for high‐performance wide‐bandgap perovskite solar cells (PSCs), which can influence the interfacial defects, charge transport, and crystallization perovskites. In this work, a facile strategy reported inserting multi‐functional (Z)‐4‐Fluoro‐ N ′‐hydroxybenzimidamide (4F‐HBM) molecule between self‐assembled monolayer (SAM) (WBG) layer, actively regulating crystal growth promoting hole extraction. It found that F atoms in 4F‐HBM form hydrogen bond with SAM. interacts Pb 2+ perovskites, effectively reducing defect state density at non‐radiative recombination losses interface. 1.77‐eV WBG PSC using has significantly improved power conversion efficiency 20.09% high fill factor 84.71%, higher than those control device (18.47% 82.53%, respectively). maintain 85% its original after 821 h maximum point tracking, showing stability. Four‐terminal all‐perovskite tandem by combining such semitransparent subcell 1.25 eV low‐bandgap obtains PCE 28.71%, among highest efficiencies four‐terminal to date. work offers promising enhance contact passivation perovskite‐based devices.

Язык: Английский

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Nucleation‐Layer Assisted Quasi‐2D Ruddlesden‐Popper Tin Perovskite Solar Cells With High Oxygen Stability

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 8, 2025

Abstract Tin (Sn)‐based perovskite solar cells (PSCs) are extremely vulnerable to oxygen. Nevertheless, mechanism understanding and fundamental strategies achieve oxygen‐stable Sn‐based PSCs lacking. Here a nucleation‐layer assisted (NLA) strategy by forming nucleation layer at the interface of hole transport attain highly quasi‐2D Ruddlesden‐Popper (RP) is reported. The formation process consists washing off prepared film annealing residue on substrate, which produces new substrate for fabrication. Such can transform subsequently deposited from small‐n‐value dominated wide phase distribution with random crystal orientation into an intermediate‐n‐value narrow vertical orientation. This also improves morphology coadjacent flake‐like grains, leading reduced grain boundaries pinholes. resultant NLA shows more efficient carrier capability, lower exciton‐binding energy, weakened electron‐phonon coupling, significantly decreased oxygen diffusion rate upon exposure. Consequently, RP PSC champion efficiency 11.18% obtained. unencapsulated device preserves 95% its initial after 2700‐h aging test, creating record stability PSCs.

Язык: Английский

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Organic Dyes for Interfacial Regulation of Iodine in Metal Halide Perovskite Wide-Bandgap and Tandem Solar Cells

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Май 27, 2025

In mixed-halide wide-bandgap (WBG, FA0.8Cs0.2PbI1.8Br1.2) perovskite solar cells (PSCs), halide ion migration triggered by light exposure results in phase separation. The migrating iodide anions (I-) undergo oxidation to iodine (I2) upon exposure, whereas Pb2+ is reduced metallic Pb0. This process induces irreversible degradation of PSCs, ultimately causing a marked decline photovoltaic performance. To mitigate this issue, multifunctional dye molecule, 12-[3-(carboxymethyl)-5-[[4-[4-(2, 2-diphenylvinyl) phenyl]-1, 2, 3, 3a, 4, 8b-hexahydrocyclopenta [b] indol-7-yl] methylene]-4, 4'-dioxo-2'-thioxo-4, 5-dihydro -2'H, 3H-[2, 5'-bithiazolylidene]-3'(4'H)-yl] dodecanoic acid (D358), was introduced at the interface perovskites. Under electron transfer conditions, D358 molecule facilitated reduction I2 I- and Pb0 Pb2+, thereby effectively suppressing segregation. Furthermore, defects PSCs were successfully passivated carboxyl groups molecule. With adjustment, power conversion efficiency (PCE) WBG device increased from 18.75 19.94%, indicating significant performance improvement. When integrated with narrow-bandgap (FA0.6MA0.3Cs0.1Pb0.5Sn0.5I3) subcell, PCE 28.83% obtained all-perovskite tandem cells. Continuous maximum point tracking operation for 1000 h (ISOS-L-1 standards, 25 °C) revealed superior stability D358-treated devices, preserving 82.9% initial PCE.

Язык: Английский

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Progress and prospects for all-perovskite tandem solar cells

Journal of Energy Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 1, 2024

Язык: Английский

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Predicting and Analyzing Stability in Perovskite Solar Cells: Insights from Machine Learning Models and SHAP Analysis

Materials Today Energy, Год журнала: 2024, Номер unknown, С. 101769 - 101769

Опубликована: Дек. 1, 2024

Язык: Английский

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