Space-Charge-Limited Current Measurements: A Problematic Technique for Metal Halide Perovskites

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер unknown, С. 10001 - 10008

Опубликована: Сен. 24, 2024

Space-charge-limited current (SCLC) measurements play a crucial role in the electrical characterization of semiconductors, particularly for metal halide perovskites. Accurate reporting and analysis SCLC are essential gaining meaningful insights into charge transport defect density these systems. Unfortunately, performing on perovskites is complicated by their mixed electronic-ionic conductivity. This complexity led to data often being incorrectly analyzed using simplified models unsuitable materials reported without information about how were performed. In light recently published data, common challenges perovskite addressed, solutions discussed this paper. The applicability often-used analytical models, overlooked issues related ionic-electronic conductivity perovskites, creating single-carrier devices investigated drift-diffusion simulations. Finally, guidelines more accurate improved provided.

Язык: Английский

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Oriented Molecular Dipole‐Enabled Modulation of NiO_x/Perovskite Interface for Pb‐Sn Mixed Inorganic Perovskite Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 19, 2025

Abstract Nickel oxide (NiO x ) is considered as a potential hole transport material in the fabrication of lead‐tin (Pb‐Sn) perovskite solar cells (PSCs) for tandem applications. However, energy level mismatch and unfavorable redox reactions between Ni ≥3+ species Sn 2+ at NiO /perovskite interface pose challenges. Herein, high‐performance Pb‐Sn‐based inorganic PSCs are demonstrated by modulating with multifunctional 4‐aminobenzenesulfonic acid (4‐ABSA) interlayer. The 4‐ABSA interlayer induces formation an oriented dipole moment directed from to perovskite, effectively elevating valance band maximum film, thus balancing difference promoting charge carrier extraction device. Moreover, molecules interact both suppressing reaction highly active perovskites while regulating crystallization. This results films reduced defect density enlarged grains. Consequently, remarkable device efficiency 17.4% obtained, representing highest reported value far. Furthermore, enhances UV‐radiation operational stability resulting devices, maintaining over 80% 90% initial after 240 h UV‐light exposure 480 1 sun illumination, respectively.

Язык: Английский

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Synergetic Interface and Bulk Defects Modification with Identical Organic Molecule for Efficient Inverted Perovskite Solar Cells

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Янв. 15, 2025

Recent progress in inverted perovskite solar cells (IPSCs) mainly focused on NiOx modification and (PVK) regulation to enhance efficiency stability. However, most works address only monofunctional modifications, identical molecules with the ability simultaneously optimize interface bulk phase have been rarely reported. This work proposes a dual approach using 4-amino-3,5-dichlorobenzotrifluoride (DCTM) both upper interfaces reduction of defects perovskite. Amino group DCTM increases Ni3+/Ni2+ ratio NiOx, thereby increasing conductivity optimizing energy alignment. Additionally, fills Pb2+ I– vacancies perovskite, which improves vertical orientation grains subsequently reduces nonradiative recombination, achieving increased carrier lifetime. PVK modified by exhibits enhanced level alignment electron transport layer, while femtosecond transient absorption (TA) spectroscopy confirms that facilitates efficient transport, leading high-performance IPSCs. The optimized IPSCs achieve maximum 22.8% reduced hysteresis (0.7%). Moreover, unencapsulated device preserves over 80% its initial power conversion (PCE) after 1000 h stored air at 30% relative humidity. strategy monomolecular offers straightforward solution for optimization provides new insights into selecting aniline-derived

Язык: Английский

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Spatial Atomic Arrangement of Cyclohexyl‐Based Ligands for Enhanced Interface Passivation in 2D/3D Perovskite Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 22, 2025

Abstract Metal halide perovskite solar cells (PSC) have emerged as a promising candidate for next‐generation photovoltaic technologies, achieving remarkable power conversion efficiencies (PCE) in polycrystalline thin‐films. Nonetheless, their PCE and long‐term stability are often limited by high density of defects at interfaces grain boundaries. One effective strategy to mitigate these issues is forming 2D/3D heterojunction structure introducing surface‐passivating interfacial layer quasi‐2D Ruddlesden–Popper (RPP) with various functional ligand molecules. In this study, hydroxyl‐functionalized cyclohexyl ammonium hydrochloride (ACHACl) employed the molecule, which features dual groups. A comparative analysis reveals that cis‐ configurations ligands exhibit enhanced adsorption on [PbI 6 ] 4− octahedra lead perovskites, enabling more passivation including metallic Pb 0 3D Moreover, incorporating RPP improves hole extraction transport (HTL) inducing an upward shift valence band edge. Consequently, PSCs achieve 23% under 1‐Sun illumination, along significantly improved stability, presenting critical role tailoring atomic molecules boost both efficiency PSCs.

Язык: Английский

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Rationally tailored passivation molecules to minimize interfacial energy loss for efficient perovskite solar cells

Deleted Journal, Год журнала: 2025, Номер 2(1)

Опубликована: Апрель 29, 2025

Abstract Labor-intensive, trial-and-error methods are frequently employed for modifying the perovskite surface to mitigate trap defects. There is an urgent need rationally designed and efficient molecular passivators. To address performance stability challenges caused by defects in polycrystalline perovskite, we have tailored passivation molecules, 4-(trifluoromethyl)benzoic anhydride (TFBA), ethyl 4-(trifluoromethyl)benzoate (TFB), acid (PTF), minimize interfacial energy loss modulate bandgap alignment achieving solar cells (PSCs). These molecules could target defects, particularly Pb–I antisite with –COOH trifluoromethyl functional groups at edges. Among them, PTF exhibited superior coordinating its carboxyl group Pb 2+ , effectively suppressing non-radiative recombination. Additionally, fluorine sites these corrected lattice distortions stabilized structure through hydrogen bonding MA/FA cations, reducing ion migration, enhancing moisture resistance. As a result, PTF-modified PSCs achieved efficiency of 25.57% maintained over 85% their initial after 1 600 h aging. This study provides clear pathway optimizing strategies rational design.

Язык: Английский

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Mixed Antisolvent Strategy Enables Synergistic Crystallization Control and Defect Passivation in Perovskite Solar Cells

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Май 7, 2025

In the one-step solution method of perovskite film preparation, antisolvents are widely used to control crystallization, which directly influences quality films. Herein, hexafluorobenzene (HFB) was involved in mixed antisolvent (MAS) system produce high-quality films with dual functions crystallization and defect passivation. Beyond improving interface contact, a small amount HFB remained passivated uncoordinated Pb2+ defects. Consequently, HFB-involved MAS-derived exhibited higher crystallinity, smoother surfaces, better interfacial contacts, fewer defects than those without additives. These enhancements significantly improved open-circuit voltage (VOC) fill factor (FF) corresponding solar cells, resulting an increase power conversion efficiency (PCE) from 23.18% 24.53%. Furthermore, cells prepared by this stability. This study highlights facile efficient for simultaneously regulating mitigating incorporating functionalized antisolvents, thus photovoltaic performance cells.

Язык: Английский

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Dual-site regulation approach for improving photoelectric performance of perovskite solar cells

Chemical Engineering Journal, Год журнала: 2024, Номер 500, С. 157303 - 157303

Опубликована: Ноя. 1, 2024

Язык: Английский

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