A crystal capping layer for formation of black-phase FAPbI ₃ perovskite in humid air

Science, Journal Year: 2024, Volume and Issue: 385(6705), P. 161 - 167

Published: July 11, 2024

Black-phase formamidinium lead iodide (α-FAPbI 3 ) perovskites are the desired phase for photovoltaic applications, but water can trigger formation of photoinactive impurity phases such as δ-FAPbI . We show that classic solvent system perovskite fabrication exacerbates this reproducibility challenge. The conventional coordinative dimethyl sulfoxide (DMSO) promoted under high relative humidity (RH) conditions because its hygroscopic nature. introduced chlorine-containing organic molecules to form a capping layer blocked moisture penetration while preserving DMSO-based complexes regulate crystal growth. report power conversion efficiencies >24.5% solar cells fabricated across an RH range 20 60%, and 23.4% at 80% RH. unencapsulated device retained 96% initial performance in air (with 40 60% RH) after 500-hour maximum point operation.

Language: Английский

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Efficient and Stable Red Perovskite Light‐Emitting Diodes via Thermodynamic Crystallization Control

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

Published: Sept. 2, 2024

Abstract Efficient and stable red perovskite light‐emitting diodes (PeLEDs) demonstrate promising potential in high‐definition displays biomedical applications. Although significant progress has been made device performance, meeting commercial demands remains a challenge the aspects of long‐term stability high external quantum efficiency (EQE). Here, an situ crystallization regulation strategy is developed for optimizing films through ingenious vapor design. Mixed containing dimethyl sulfoxide carbon disulfide (CS 2 ) incorporated to conventional annealing, which contributes thermodynamics dominated well‐aligned cascade phase arrangement. Additionally, surface defect density minimized by CS molecule adsorption. Consequently, target exhibit smooth exciton energy transfer, reduced density, blocked ion migration pathways. Leveraging these advantages, spectrally PeLEDs are obtained featuring emission at 668, 656, 648 nm, yield record peak EQEs 30.08%, 32.14%, 29.04%, along with prolonged half‐lifetimes 47.7, 60.0, 43.7 h initial luminances 140, 250, 270 cd m −2 , respectively. This work provides universal represents stride toward commercialization PeLEDs.

Language: Английский

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Perovskite Crystallization and Hot Carrier Dynamics Manipulation Enables Efficient and Stable Perovskite Solar Cells with 25.32% Efficiency

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(24)

Published: April 29, 2024

Abstract Modulating perovskite crystallization and understanding hot carriers (HCs) dynamics in films are very critical to achieving high‐performance solar cells (PSCs). Herein, a small organic molecule (6BAS) with multisite anchors (C═O) as an efficient additive is introduced into PbI 2 precursors modulate during two‐step sequential deposition. The chemical interaction between 6BAS enables more preferential crystal enlarged interplanar spacing of lattice, which beneficial the penetration ammonium salts layer complete conversion perovskite, consequently promoting realize high‐quality larger grain size reduced defect state. By ultrafast spectroscopy, it found that incorporation can efficiently prolong HCs cooling, helps enhance transfer retard charge carrier recombination device. As result, doped‐PSCs efficiency significantly enhances 25.32% from 22.91%. target device achieves enhanced long‐term stability. Only 6% degradation realized for un‐encapsulated after 70 days under N . Meanwhile, 6BAS‐treated retains 95% its initial PCE 1160 h operation at maximum power point continuous AM 1.5 G illumination.

Language: Английский

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Tuning Isomerism Effect in Organic Bulk Additives Enables Efficient and Stable Perovskite Solar Cells

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Jan. 10, 2025

Abstract Organic additives with multiple functional groups have shown great promise in improving the performance and stability of perovskite solar cells. The can passivate undercoordinated ions to reduce nonradiative recombination losses. However, how these synergistically affect enhancement beyond passivation is still unclear. Specifically, isomeric molecules different substitution patterns or molecular shapes remain elusive designing new organic additives. Here, we report two carbazolyl bisphosphonate additives, 2,7-CzBP 3,6-CzBP. isomerism effect on charge transport process was studied. similar effects through interactions, e.g., P = O···Pb, O···H–N N–H···I. further bridge crystallites facilitates transport. Power conversion efficiencies (PCEs) 25.88% 21.04% were achieved for 0.09 cm 2 devices 14 modules after treatment, respectively. exhibited enhanced operational maintaining 95% initial PCE 1000 h continuous maximum power point tracking. This study hints at importance tuning positions which paves way innovation next-generation multifunctional aromatic

Language: Английский

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Facet-orientation-enhanced thermal transfer for temperature-insensitive and stable p-i-n perovskite solar cells

eScience, Journal Year: 2025, Volume and Issue: unknown, P. 100372 - 100372

Published: Jan. 1, 2025

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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Revealing Interaction of Fluorinated Propylamine Hydrochloride with Precursor and Defect States of Perovskite Films Toward Efficient Flexible Solar Cells

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

Published: May 13, 2024

Abstract The trap state at the surfaces and grain boundaries of perovskite is one major obstacles to further commercialization flexible solar cells (FPSCs). Herein, two innovative multifunctional fluorinated propylamine salt 2,2,3,3,3‐pentafluoropropylamine hydrochloride (PFPACl) 3,3,3‐triflupropylamine (TFPACl) are in situ introduced onto photo absorbing layer improve performance FPSCs. nuclear magnetic resonance (NMR) spectroscopy indicates strong interactions both PFPACl TFPACl with precursor components. For first time, structures supramolecular complexes formed by additives FAI deduced from NOESY NMR data, thus pointing importance preorganization components solution before film casting. experiments density functional theory（DFT) calculations reveal that likely dissociated more into form R‐NH 3 + ‐Cl − due higher electronegativity fluoroalkyl tail. Therefore, PFPA binds strongly V FA defects than TFPA , anion Cl has enough interaction uncoordinated Pb 2+ leading homogeneous coverage on entire surface films better energy alignment hole transport layer. Consequently, PFPACl‐treated FPSCs achieved a relatively high PCE 23.59% excellent mechanical robustness operational stability.

Language: Английский

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An Equalized Flow Velocity Strategy for Perovskite Colloidal Particles in Flexible Perovskite Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(32)

Published: May 29, 2024

The non-uniform distribution of colloidal particles in perovskite precursor results an imbalanced response to the shear force during flexible printing process. Herein, it is observed that continuous disordered migration occurring inks significantly contributes enlargement size and diminishes crystallization activity inks. Therefore, a molecular encapsulation architecture by glycerol monostearate mitigate collisions ink, while simultaneously homogenizing colloids minimize their diffusion disparities, devised. utilization with structure enables achievement uniform deposition process, thereby effectively balancing rate phase transition film facilitating homogeneous films. large-area device (1.01 cm

Language: Английский

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Enhancing Efficiency of Large-Area Wide-Bandgap Perovskite Solar Modules with Spontaneously Formed Self-Assembled Monolayer Interfaces

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(15), P. 4015 - 4023

Published: April 5, 2024

Wide-bandgap (WBG) perovskites play a crucial role in perovskite-based tandem cells. Despite recent advances using self-assembled monolayers (SAMs) to facilitate efficiency breakthroughs, achieving precise control over the deposition of such ultrathin layers remains significant challenge for large-scale fabrication WBG perovskite and, consequently, modules. To address these challenges, we propose facile method that integrates MeO-2PACz and Me-4PACz optimal proportions (Mixed SAMs) into precursor solution, enabling simultaneous codeposition SAMs. This technique promotes spontaneous formation charge-selective contacts while reducing defect densities by coordinating phosphonic acid groups with unbonded Pb2+ ions at bottom interface. The resulting solar cells (PSCs) demonstrated power conversion 19.31% small-area devices (0.0585 cm2) 17.63% large-area modules (19.34 cm2), highlighting potential this strategy fabricating high-performance, PSCs enhanced reproducibility. These findings offer valuable insights advancing scalable

Language: Английский

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Manipulating the crystallization kinetics of halide perovskites for large-area solar modules

Communications Materials, Journal Year: 2024, Volume and Issue: 5(1)

Published: July 23, 2024

Abstract In the last decade, laboratory-scale single-junction perovskite solar cells have achieved a remarkable power conversion efficiency exceeding 26.1%. However, transition to industrial-scale production has unveiled significant gap. The central challenge lies in difficulty of achieving uniform, high-quality films on large scale. To tackle this issue, various innovative strategies for manipulating crystallization emerged recent years. Based an in-depth fundamental understanding nucleation and growth mechanisms large-area prepared through blade/slot-die coating methods, review offers critical examination manipulation modules. Lastly, we explore future avenues aimed at enhancing stability PSMs, thereby steering field toward commercially viable applications.

Language: Английский

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