Near‐Stoichiometric and Homogenized Perovskite Films for Solar Cells with Minimized Performance Variation

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(17)

Published: Feb. 22, 2023

Mixed-cation, small band-gap perovskites via rationally alloying formamidinium (FA) and methylammonium (MA) together have been widely employed for blade-coated perovskite solar cells with satisfied efficiencies. One of the stringent challenges lies in difficult control nucleation crystallization kinetics mixed ingredients. Herein, a pre-seeding strategy by mixing FAPbI3 solution pre-synthesized MAPbI3 microcrystals has developed to smartly decouple process. As result, time window initialized greatly extended 3 folds (i.e. from 5 s 20 s), which enables formation uniform homogeneous alloyed-FAMA films designated stoichiometric ratios. The resultant achieved champion efficiency 24.31 % accompanied outstanding reproducibility more than 87 devices showing efficiencies higher 23 %.

Language: Английский

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Uncovering chemical structure-dependency of ionic liquids as additives for efficient and durable perovskite photovoltaics

Nano Energy, Journal Year: 2024, Volume and Issue: 125, P. 109549 - 109549

Published: March 27, 2024

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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Synergistic Full‐Scale Defect Passivation Enables High‐Efficiency and Stable Perovskite Solar Cells

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(44)

Published: Oct. 8, 2023

Abstract Despite remarkable progress in perovskite solar cells (PSCs), the unsatisfying stability strongly interrelated with defect density remains main obstacle for commercialization. Herein, a synergetic passivation method is judiciously designed that consists of precursor engineering strategy based on an ionic liquid 1‐butylsulfonate‐3‐methylimidazolium dihydrogen phosphate (BMDP), and two‐stage annealing (TSA) treatment to sufficiently passivate defects enhance performance further. It found multifunctional groups from BMDP have strong chemical interactions form chelated complexes components thus effectively passivating intrinsic defects. Synergized by sequential TSA treatment, formed hydrophobic can be precisely controlled filling along grain boundaries (GBs) surfaces, leading wrapping grains significant GBs. Consequently, both deep‐ shallow‐level bulk, at GBs surface are passivated, resulting champion efficiency 24.20%. Impressively, resultant unencapsulated films corresponding devices exhibit admirable maintaining 83.9% initial composition 4000 h aging moist air, 81.7% original structure after continuous heating 1600 h, 97% power conversion 1000 under illumination. This work provides efficient toward improved PSCs.

Language: Английский

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Multifunctional Organic Potassium Salt Additives as the Efficient Defect Passivator for High‐Efficiency and Stable Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(25)

Published: March 20, 2023

Abstract Despite the rapid developments are achieved for perovskite solar cells (PSCs), existence of various defects in devices still limits further enhancement power conversion efficiency (PCE) and long‐term stability devices. Herein, efficient organic potassium salt (OPS) para‐halogenated phenyl trifluoroborates is presented as precursor additives to improve performance PSCs. Studies have shown that 4‐chlorophenyltrifluoroborate (4‐ClPTFBK) exhibits most effective interaction with lattice. Strong coordination between BF 3 − /halogen anion uncoordinated Pb 2+ /halide vacancies, along hydrogen bond F H FA + observed. Thus, due synergistic contribution anionic groups, high‐quality film large grain size low defect density achieved. As a result, optimal show an enhanced 24.50%, much higher than control device (22.63%). Furthermore, unencapsulated present remarkable thermal stability, maintaining 86% initial PCE after test at 80 °C 1000 h 95% storage air 2460 h.

Language: Английский

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Bifunctional Cellulose Interlayer Enabled Efficient Perovskite Solar Cells with Simultaneously Enhanced Efficiency and Stability

Advanced Science, Journal Year: 2023, Volume and Issue: 10(8)

Published: Feb. 7, 2023

Abstract Interfacial engineering is a vital strategy to enable high‐performance perovskite solar cells (PSCs). To develop efficient, low‐cost, and green biomass interfacial materials, here, bifunctional cellulose derivative presented, 6‐O‐[4‐(9H‐carbazol‐9‐yl)butyl]‐2,3‐di‐O‐methyl (C‐Cz), with numerous methoxy groups on the backbone redox‐active carbazole units as side chains. The C‐Cz shows excellent energy level alignment, good thermal stability strong interactions surface, all of which are critical for not only carrier transportation but also potential defects passivation. Consequently, modifier, PSCs achieve remarkably enhanced power conversion efficiency (PCE) 23.02%, along significantly long‐term stability. These results underscore advantages materials layers effective charge transport properties passivation capability efficient stable PSCs.

Language: Английский

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Boosting efficiency and stability of 2D alternating cation perovskite solar cells via rational surface-modification: Marked passivation efficacy of anion

Journal of Energy Chemistry, Journal Year: 2023, Volume and Issue: 84, P. 354 - 362

Published: June 16, 2023

Language: Английский

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Electrochemical Reduction and Ion Injection of Annealing‐Free SnO₂ for High Performance Perovskite Solar Cells

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(26)

Published: May 26, 2023

Abstract The electron transport layer (ETL) plays a crucial role for efficiency and stability of perovskite solar cells (PSCs). As promising low‐temperature ETL, tin oxide still requires complicated surface chemical decoration or heat‐treatments to further passivate the defects adjust band energy level improve optoelectronic performance device. Herein, novel efficient strategy is developed solution prepared annealing‐free SnO 2 ETL PSCs. Through simple electrochemical regulation, elemental composition, valence ratio Sn, concentration oxygen vacancies, hydroxyl groups, dopant ions are precisely modified with optimized band, reduce defect density, enhance high carrier Thus, an increase power conversion (PCE) from 21.6% 24.7% V OC 1.19 obtained. devices maintain 95% initial PCE after 2000 h storage, 80% 900 aging in atmospheric environment at 75 °C RH 20 ± 5%. Moreover, module based on as made achieve 21.3%.

Language: Английский

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Ionic liquid engineering enabled in‐plane orientated 1D perovskite nanorods for efficient mixed‐dimensional perovskite photovoltaics

InfoMat, Journal Year: 2023, Volume and Issue: 5(8)

Published: June 16, 2023

Abstract Mixed‐dimensional engineering of perovskite material has been demonstrated as a facile and promising strategy to improve both photovoltaic performance long‐term stability solar cells (PSCs). In this study, we report an in‐plane preferred orientation 1D induced by ionic liquid (IL) 1‐(3‐cyanopropyl)‐3‐methylimidazolium chloride (CPMIMCl) for the first time via sequential deposition approach, leading mixed dimensional thin films. The generated one‐dimensional (1D) CPMIMPbI 3 with resides at grain boundaries three‐dimensional (3D) can be appreciably observed from morphology level, creation high‐quality films large size more efficient defect passivation. Moreover, dispersion IL in bulk phase allows formation multiple level passivation inhibit non‐radiative recombination optimize carrier transport. This not only yields mixed‐dimensional heterostructure nano‐rods but also significantly improves opto‐electronic property suppressed trap states. As result, CPMIMCl‐treated PSCs show enhanced champion power conversion efficiency (PCE) up 24.13%. More importantly, benefiting hydrophobicity formed defects suppression, corresponding PSC demonstrates excellent maintain 97.1% its pristine PCE 25°C under 50% RH condition over 1000 h. research provides innovative perspective employing low devices. image

Language: Английский

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Manipulating Crystal Growth and Secondary Phase PbI2 to Enable Efficient and Stable Perovskite Solar Cells with Natural Additives

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

Published: April 29, 2024

Abstract In perovskite solar cells (PSCs), the inherent defects of film and random distribution excess lead iodide (PbI 2 ) prevent improvement efficiency stability. Herein, natural cellulose is used as raw material to design a series derivatives for crystallization engineering. The cationic derivative C-Im-CN with cyano-imidazolium (Im-CN) cation chloride anion prominently promotes process, grain growth, directional orientation perovskite. Meanwhile, PbI transferred surface grains or formed plate-like crystallites in local domains. These effects result suppressing defect formation, decreasing boundaries, enhancing carrier extraction, inhibiting non-radiative recombination, dramatically prolonging lifetimes. Thus, PSCs exhibit high power conversion 24.71%. Moreover, has multiple interaction sites polymer skeleton, so unencapsulated maintain above 91.3% their initial efficiencies after 3000 h continuous operation conventional air atmosphere have good stability under humidity conditions. utilization biopolymers excellent structure-designability manage opens state-of-the-art avenue manufacturing improving PSCs."Image missing"

Language: Английский

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