Benign methylformamidinium byproduct induced by cation heterogeneity inhibits local formation of δ-phase perovskites

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Methylammonium chloride (MACl) selectively promotes the formation of N -methylformamidinium (MFA + )PbI 3 at grain boundaries (GBs) and as clusters near GBs while suppress δ-FAPbI 3.

Language: Английский

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Synergistic Effect of H⁺ and I⁻ Oxidation Enables Long‐Term Stability of the Precursor Solutions and Enhanced Performance of FA‐Dominated Perovskite Solar Cells

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

Published: Oct. 2, 2024

Abstract The role of MA in FAMA mixed perovskite remains far from being fully understood, due to the intricate chemical evolutions precursor solutions. Adjusting content arbitrarily a great challenge. This study elucidates synergistic effect between H + and I − oxidation which helps reduce FA‐dominated perovskite. Briefly, excessive boosts balanced rapid assembly FA components hampers unfavorable evolution induced by nucleophilic reaction solution, while accelerates situ crystallization Leveraging this effect, centimeter‐scaled x (1‐x) PbI 3 single crystals with adjustable values are successfully fabricated. In addition, peroxyacetic acid is introduced as additive, enabling blade‐coated 0.9 0.1 solar cells (PSCs) achieve an impressive efficiency 23.7%. achieved here among highest for PSCs exceeding 90% so far. optimized solution developed exceptional stability, allowing it be stored under air conditions over 2 months without significant degradation cell efficiency. outcome satisfies requirements commercialization.

Language: Английский

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Stabilizing Precursor Solutions by Proton‐Rich Additive for High‐Performance Air‐Processed Solar Cells

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Storing perovskite precursor solutions under ambient conditions poses a significant challenge to commercialization, as humidity and oxidation accelerate ageing introduce defects in devices. A major contributor solution impurity phases is the deprotonation of hybrid organic cations, specifically methylammonium (MA+) formamidinium (FA+). In this work, proton-rich additive, 4-(aminomethyl)pyridine 2-iodide, used inhibit MA+ by generating free H+, thereby mitigating degradation cations oxygen stress. The treated stored for several days exhibits no condensation reaction products. Due synergistic effect H+ I-, films exhibit pure phase formation abnormal "aggregate" crystals. Therefore, additive reacts with FA+ form new complexes, termed N-(4-methylpyridine)formamidinium), which efficiently passivate nonradiative defects. Consequently, strategy enables solar cells achieve power conversion efficiency (PCE) 25.25%, demonstrating enhanced long-term stability both light thermal Notably, optimized device retains 95.5% its initial PCE after 1200 h continuous illumination 91.61% 600 at 85 °C 85% relative humidity.

Language: Английский

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Multiple Stabilization Effects of Benzylhydrazine on Scalable Perovskite Precursor Inks for Improved Perovskite Solar Cell Production

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(34)

Published: June 11, 2024

Abstract Perovskite precursor inks suffer various forms of degradation, such as iodide anion oxidation and organic cation breakdown, hindering reliable perovskite solar cell manufacturing. Here we report that benzylhydrazine hydrochloride (BHC) not only retards the buildup iodine previously reported but also prevents breakdown cations. Through investigating BHC chemical reactions, elucidate protonation dehydration mechanisms, converting to harmless volatile compounds, thus preserving film crystallization performance. This inhibition effect lasts nearly a month with minimal BHC, contrasting control without where cations fully react in less than week. enhanced understanding, from additive stabilization end products, promises improved production reliability.

Language: Английский

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Accelerating direct formation of α-FAPbl3 by dual-additives synergism for inverted perovskite solar cells with efficiency exceeding 26 %

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 505, P. 159056 - 159056

Published: Jan. 6, 2025

Language: Английский

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Enhanced field electron emission of formamidine lead triiodide induced by strong electric field assisted morphology reconstruction

Applied Surface Science, Journal Year: 2025, Volume and Issue: unknown, P. 162423 - 162423

Published: Jan. 1, 2025

Language: Английский

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Enhancing α-FAPbI₃ Crystallization and Photovoltaic Performance through Inhibiting MFA Formation

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

Published: Feb. 27, 2025

Methylammonium chloride (MACl) additive is almost irreplaceable in high-performance formamidinium (FA) perovskite photovoltaics. However, the byproduct of methyl (MFA+) from reaction MA0 and FA damages compositional purity phase stability α-FAPbI3. The addition iodine (I2) to FAPbI3 precursor has been reported inhibit formation MFA+. Here, we systematically investigate effect MAI on films devices by using replace MACl I2. results demonstrate that produces more I3- precursor, which inhibits between MA thus blocks Meanwhile, MFA+ reduced due delayed evaporation caused its strong interaction with I3-, facilitating growth α-FAPbI3 an improved bottom morphology. It eliminates unreacted PbI2, forming a homogenized phase, facilitates ordered along (111) facet, enhancing charge transport increasing open-circuit voltage (VOC). optimized device shows 2% improvement PCE, VOC 1.050 1.103 V. Additionally, target retains 97% initial performance after 5495 min operation under maximum power point tracking, compared 82.3% 2000 for control device. This work provides insights into inhibiting byproducts induced MA-FA side following introduction MACl.

Language: Английский

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Grain‐Boundary Passivation by Cation Reaction Minimizes VOC-deficit of 1.8 eV Perovskites for Efficient All-Perovskite Tandem Solar Cells

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110882 - 110882

Published: March 1, 2025

Language: Английский

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Surface Passivation and Energy Alignment Modulation of n‐i‐p Perovskite Solar Cells with Self‐Assembled Molecule

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Perovskite's surface defects trigger deep level traps and energy misalignment, resulting in substantial interface recombination loss perovskite solar cells (PSCs). Herein, 9-fluoreneacetic acid (FAA), a self-assembled molecule (SAM), is employed to passivate the modulate alignment. SAM modification reduces defect density from 6.37 × 1015 3.11 cm-3 produces p-type with an upward band bending, thus constructing well-defined n-i-p heterojunction for efficient charge separation. Accordingly, target PSC realizes 24.75% power conversion efficiency (PCE) retains 92% 1100 h during maximum point tracking (MPPT) at room temperature. Furthermore, over 80% of initial PCE has been reserved after 2500 aging 25-30% relative humidity (RH). This strategy expected enhance stability PSCs.

Language: Английский

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Suppressing Deprotonation to Extend the Shelf Life of Perovskite Precursor Solutions and Enhance the Stability and Efficiency of Perovskite Solar Cells

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

Published: April 29, 2025

Abstract Amid the rapid advancement of formamidine (FA)‐based perovskite solar cells (PSCs), methylammonium chloride (MACl) has emerged as a pivotal molecule, widely recognized in achieving high‐efficiency PSCs. However, precursor solution (PPS), particularly after prolonged storage, deprotonated MA⁺ (MA 0 ) undergoes cationic addition with FA⁺, leading to relative depletion FA⁺ and reduction crystalline phase purity. Herein, using Piperazine‐2‐carboxylic acid dihydrochloride (PCADCl) inhibit deprotonation by forming strong two‐point hydrogen bonds between piperazine's amine groups proton (H⁺) MA⁺is proposed, thereby extending shelf life PPS. Furthermore, COOH PCADCl furtherly suppress while promoting coordination unbound Pb 2+ , reducing film defects improving purity phase. Additionally, energy level arrangement PSCs is improved. Benefiting from this strategy, PSC fabricated modified PPS achieves an impressive efficiency 25.56% retains 96% its initial performance aging for 20 days. Moreover, unencapsulated device 97% over 1300 h. This work significantly advances process development scientific research, representing crucial step toward large‐scale production commercialization

Language: Английский

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