Tailoring interface and morphology of TiO2 electron transport layer with potassium bitartrate for high-performance perovskite solar cells

Applied Surface Science, Journal Year: 2024, Volume and Issue: 662, P. 160139 - 160139

Published: April 21, 2024

Language: Английский

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Surface Treatment with Tailored π-Conjugated Fluorene Derivatives Significantly Enhances the Performance of Perovskite Light-Emitting Diodes

ACS Nano, Journal Year: 2024, Volume and Issue: 18(22), P. 14696 - 14707

Published: May 23, 2024

Surface defect passivation and carrier injection regulation have emerged as effective strategies for enhancing the performance of perovskite light-emitting diodes (Pero-LEDs). It usually requires two functional molecules to realize separately. In other words, developing one single molecule possessing these capabilities remains challenging. Herein, we utilized π-conjugated fluorene derivatives surface treatment materials, 9,9-Spirobi[fluorene] (SBF), 9,9-Spirobifluoren-2-yl-diphenylphosphine oxide (SPPO1), 2,7-bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13), investigate influence their chemical structure on device optoelectronic performance, especially regulation. Consequently, capability double-bonded SPPO13 surpassed single-bonded SPPO1 nonbonded SBF, which all showed excellent electron transport properties, injection. The maximum external quantum efficiencies (EQE) Pero-LEDs treated with SPPO1, were 8.13, 17.48, 22.10%, respectively, exceeding that derivative-free (6.55%). Notably, SPPO13-treated devices exhibited exceptional reproducibility, yielding an average EQE 20.00 ± 1.10% based 30 devices. This result emphasizes potential tailored Pero-LEDs.

Language: Английский

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Machine-Learning-Assisted Design of Buried-Interface Engineering Materials for High-Efficiency and Stable Perovskite Solar Cells

ACS Energy Letters, Journal Year: 2024, Volume and Issue: unknown, P. 5924 - 5934

Published: Nov. 20, 2024

Buried-interface engineering is crucial to the performance of perovskite solar cells. Self-assembled monolayers and buffer layers at buried interface can optimize charge transfer reduce recombination losses. However, complex mechanisms difficulty in selecting suitable functional groups pose great challenges. Machine learning (ML) offers a powerful tool for screening identifying effective structures modification. Our ML-driven approach led preparation two promising organic molecules, PAPzO PAPz, which exhibit synergistic interactions with SnO2 perovskites. These molecules decrease trap densities, elongate carrier lifetimes, retard crystallization. PAPzO, stronger binding energy better aligned levels, enables power conversion efficiency (PCE) 26.04% long-term stability, maintaining 91.24% its original PCE after 1,200 h continuous maximum point tracking. This ML-integrated marks significant advancement development efficient stable photovoltaics.

Language: Английский

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2,2′‐Bipyridyl‐4,4′‐Dicarboxylic Acid Modified Buried Interface of High‐Performance Perovskite Solar Cells

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

Abstract The regulation of interfaces remains a critical and challenging aspect in the pursuit highly efficient stable perovskite solar cells (PSCs). Here, 2,2′‐bipyridyl‐4,4′‐dicarboxylic acid ( HBPDC ) is incorporated as an interfacial layer between SnO 2 layers PSCs. two carboxylic moieties on bind to through esterification, while its nitrogen atoms, possessing lone electron pairs, interact with uncoordinated lead (Pb 2+ atoms Lewis acid‐base interactions. This dual functionality enables simultaneous passivation surface defects both buried layers. In addition, electron‐deficient nature enhances energy band alignment facilitates transfer from . Furthermore, incorporation strengthens adhesion, improving mechanical reliability. As result, PSCs exhibited impressive power conversion efficiency (PCE) 25.41 % under standard AM 1.5G conditions, along remarkable environmental stability.

Language: Английский

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Synergistic Modulation of Orientation and Steric Hindrance Induced by Alkyl Chain Length in Ammonium Salt Passivator Toward High‐performance Inverted Perovskite Solar Cells and Modules

Advanced Materials, Journal Year: 2024, Volume and Issue: 37(1)

Published: Nov. 17, 2024

Abstract Organic ammonium salts are extensively utilized for passivating surface defects in perovskite films to mitigate trap‐assisted nonradiative recombination. However, the influence of alkyl chain length on molecular orientation and spatial steric hindrance salt remains underexplored, hindering advancements more effective passivators. Here, a series organic is reported with varying lengths passivate optimize band alignment. It revealed that long chains promote parallel surface, thereby reinforcing interaction defects, whereas excessive introduces hindrance, weakening anion‐perovskite interactions. Nonylammonium acetate (NAAc) optimal achieves ideal balance between chemical interactions, resulting superior passivation. Through NAAc passivation, high‐performance inverted solar cells (PSCs) modules achieved, power conversion efficiencies (PCE) 25.79% (certified 25.12%) 19.62%, respectively. This marks record PCE PSCs utilizing vacuum flash technology ambient conditions. Additionally, NAAc‐passivated devices retain 91% their initial after 1200 h continuous maximum point operation. work offers new insights into interplay advancing design PSCs.

Language: Английский

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Suppressing Nonradiative Recombination at the Buried Interface for Highly Efficient n‐i‐p Perovskite Solar Cells with a Multifunctional Dipolar Molecular Bridge

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

Published: April 14, 2025

Abstract The nonradiative recombination losses at the buried interface, arising from interfacial defects, unfavorable energy level alignment, and residual strain, are main impediment for perovskite solar cells (PSCs) to achieve superior efficiency stability. To address this issue, a multifunctional dipolar molecular bridge, 1,4‐phenylenebis(1‐cyanoethene‐2,1‐diyl) bisphosphonic acid (CS‐103), is constructed by symmetric dual anchoring strategy, which can simultaneously interact with both sides interface of n‐i‐p PSCs. surface defects SnO 2 synchronously passivated, while alignment also well optimized due high potential large regional dipole moment CS‐103. Meanwhile, crystallization process be optimized, thus resulting in relatively crystallinity, few grain size, smooth surface. Furthermore, CS‐103 as chemically bonded strain effectively released. Accordingly, suppressed greatest extent, champion power conversion (PCE) 24.77%. unencapsulated PSCs maintain 91% initial PCE more than 1000 h according ISOS‐D‐1 protocol, presenting notable long‐term

Language: Английский

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Efficient and Moisture Resistant Wide‐Bandgap Perovskite Solar Cells with Phosphinate‐Based Iodine Defect Passivation

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

Published: May 2, 2025

Abstract Commercialization of perovskite‐based tandem solar cells requires preparing wide‐bandgap (WBG) perovskites in an ambient atmosphere environment. Here, producing high‐performance and stable WBG perovskite (PSCs) is demonstrated with blade coating air (≈60% relative humidity, RH) using sodium benzene phosphinate (SBP) as additive modulator the precursor. SBP can effectively suppress I − oxidation high humidity air, inhibit ion migration, thus phase separation; it also modulates crystallization grains, passivates surface defects, improves hydrophobicity film. The devices incorporating achieved a power conversion efficiency (PCE) up to 22.1%, which state‐of‐the‐art result for PSCs (≥1.68 eV) fabricated method. In addition, same protocol produces PCE 20.1% larger area cell (1.05 cm 2 ), over 19.5% unit on 100cm substrate. unencapsulated exhibit excellent stability, i.e., 90.3% retention after 2000 h exposure 86.3% 1000 at 85 °C argon atmosphere. This SBP‐based material modulation preparation provides new opportunity manufacturing photovoltaics.

Language: Английский

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Single‐Crystal Perovskite for Solar Cell Applications

Small, Journal Year: 2024, Volume and Issue: 20(48)

Published: Sept. 20, 2024

Abstract The advent of organic–inorganic hybrid metal halide perovskites has revolutionized photovoltaics, with polycrystalline thin films reaching over 26% efficiency and single‐crystal perovskite solar cells (IC‐PSCs) demonstrating ≈24%. However, research on remains limited, leaving a crucial gap in optimizing energy conversion. Unlike films, which suffer from high defect densities instability, offer minimal defects, extended carrier lifetimes, longer diffusion lengths, making them ideal for high‐performance optoelectronics essential understanding material behavior. This review explores the advancements potential IC‐PSCs, focusing their superior efficiency, stability, role overcoming limitations counterparts. It covers device architecture, composition, preparation methodologies, recent breakthroughs, emphasizing importance further to propel IC‐PSCs toward commercial viability future dominance photovoltaic technology.

Language: Английский

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Exploring Sm2NiMnO6 as a lead-free absorber for perovskite solar cells: Insights from theoretical and experimental approaches

Solar Energy Materials and Solar Cells, Journal Year: 2025, Volume and Issue: 283, P. 113456 - 113456

Published: Jan. 30, 2025

Language: Английский

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Decreased Hysteresis Benefited from Enhanced Lattice Oxygen and Promoted Band Alignment with Electron Transport Layer Modification in Perovskite Solar Cells

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

Published: Feb. 8, 2025

SnO2 electron transport layer (ETL) morphology plays a vital role in carrier transportation and the properties of perovskite solar cells (PSCs). However, uneven pore surface would inevitably lead to high interface defects, hysteresis, poor performance. In this work, we use molecular modifier 4-guanidinobenzoic acid methanesulfonate (GAMSA) build bridge on buried SnO2/perovskite. XPS results demonstrate that ratio lattice oxygen (OL)/adsorbed (OV) increased from 1.35 2.34 after GAMSA modification, thus, Sn4+ O vacancy defects were effectively reduced. Meanwhile, conduction band minimum ETL enhanced −4.33 eV −4.07 eV, which obviously facilitated transport. As result, optimal device exhibits an efficiency 22.42%, is much higher than control one 20.13%, with greatly decreased hysteresis index 14.35% 3.27%. Notably, optimized target demonstrated excellent long-term stability, maintaining initial 87% 2000 h storage N2 atmosphere dark at room temperature. This work paves new method modification improve restrain for performance PSCs.

Language: Английский

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