Tailoring pyridine bridged chalcogen-concave molecules for defects passivation enables efficient and stable perovskite solar cells

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 11, 2025

Suppressing deep-level defects at the perovskite bulk and surface is indispensable for reducing non-radiative recombination losses improving efficiency stability of solar cells (PSCs). In this study, two Lewis bases based on chalcogen-thiophene (n-Bu4S) selenophene (n-Bu4Se) having tetra-pyridine as bridge are developed to passivate in film. The uncoordinated Pb2+ iodine vacancy can interact with chalcogen-concave group pyridine through formation acid-base adduct, particularly both be surrounded by concave molecules, resulting effective suppression charge recombination. This approach enables a power conversion (PCE) high 25.37% (25.18% certified) n-i-p PSCs stable operation 65 °C 1-sun illumination 1300 hours N2 (ISOS-L-2 protocol), retaining 94% initial efficiency. Our work provides insight into bowl-shaped base passivation coordinated strategy high-performance photovoltaic devices.

Language: Английский

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A Versatile Bridging Molecule Managed the Buried SnO₂/Perovskite Interface for Efficient and Stable Perovskite Solar Cells

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

Published: April 3, 2025

Buried interface in perovskite solar cells (PSCs) is a critical determination for the performance and stability because it dominates crystallization of layer, non-radiative recombination, ion migration at interfaces. Herein, novel versatile modifier, potassium sucrose octasulfate (K8SOS) which rich sulfonic groups ions, introduced bridging buried SnO2 interface, to improve interfacial states further device performance. It found that K8SOS serves as bridge can not only passivate defects through multi-site strengthening chemical binding, thus effectively inhibiting non-radiation recombination suppressing migration, but also optimize surface state absorber, ultimately achieving gratifying efficiency 25.32% with negligible hysteresis. What's more, optimized delivers admirable sustaining over 90% initial power conversion after being aged under continuous 85 °C heating stress 40 ± 5% RH humidity ≈600 ≈1200 h 1-sun illumination, respectively.

Language: Английский

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Enhanced UV Stability of Perovskite Solar Modules via Downshifting Luminescent Organic–Inorganic Copper Halide Film with Near‐Unity Efficiency

Small, Journal Year: 2025, Volume and Issue: 21(11)

Published: Feb. 14, 2025

Abstract Obtaining efficient perovskite solar modules (PSMs) with enhanced UV stability is essential for their practical applications, yet remains a significant challenge. In this work, highly organic–inorganic copper halide downshifting film that significantly enhances the of PSMs demonstrated by converting high‐energy harmful photons into beneficial visible light contribute to photovoltaic performance. The tetrapropylammonium (TPA) cation selected as main framework synthesize series halides, denoted Br x I y . A near‐unity photoluminescence quantum yield (PLQY) 99.51% can be achieved precisely controlling Br/I ratio 2:4, 2 4 , which one highest values reported date. dual self‐trapped excitons (STEs) luminescence mechanism systematically investigated both temperature‐dependent and pressure‐dependent experiments. This dual‐STEs enables efficiently absorb re‐emit photons, thereby mitigating photodegradation induced light. Finally, effective layer. an optimal efficiency 22.24%, maintaining over 90% initial after exposure total dose 66.07 kWh m −2

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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Optimizing UV Resistance and Defect Passivation in Perovskite Solar Cells with Tailored Tin Oxide

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

Published: March 18, 2025

Abstract Tin oxide (SnO 2 ) as an electron transport layer (ETL) has garnered significant attention in planar perovskite solar cells (PSCs) for its excellent physical and chemical properties, paving commercial potential. However, drawbacks, such surface defects photocatalytic properties due to wide band gap, remain unresolved. Under ultraviolet (UV) light, SnO induces phase transitions at the interface, compromising device stability. In this study, fluorescent dopant sodium 2,2′‐([1,1′‐Biphenyl]‐4,4′‐Diylbis (Ethene‐2,1‐Diyl)) Dibenzenesulfonate (CF351) is introduced into Solution first time. With UV absorption, CF351 effectively blocks reducing ‐induced degradation. Perovskite films on CF351‐doped show remarkable stability under continuous irradiation (365 nm) 32 days, resistance transition improved by 100%. PSCs retaining 80.8% of their initial power conversion efficiency (PCE) after ≈1000 h exposure, compared only 18.7% control. Additionally, passivates interfacial defects, regulates crystallization, optimizes energy levels. It's down‐conversion capability also enhances photocurrent generating extra visible photons. As a result, achieve PCE 22.59%, significantly surpassing 20.42% control devices. This work provides effective strategy preparing highly efficient stable PSCs.

Language: Английский

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Surface Modification with Diaza-Crown Ether for High-Efficiency and Stable Inverted Perovskite Solar Cells

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

Published: March 27, 2025

The presence of positively charged cationic defects and residual PbI2 on the perovskite surface has hindered improvement device performance long-term stability. Herein, 4,10-diaza-15-crown 5-ether (DA15C5), a diaza-crown ether featuring multiple N atom O donors, is developed to modify surface. Owing strong chemical interactions between DA15C5 both Pb2+ A-site cations, films are effectively passivated, thereby suppressing nonradiative recombination promoting charge transport at cathode interface. Furthermore, treatment promotes formation two-dimensional (2D) phase by reacting with PbI2, which optimizes energy-level alignment enhances film Consequently, open-circuit voltage (VOC) fill factor (FF) solar cells (PSCs) improved significantly, achieving an impressive power conversion efficiency (PCE) 24.75%. Moreover, environmental thermal stabilities DA15C5-treated PSCs markedly enhanced. unencapsulated retains over 80% initial PCE after heating 1400 h 85 °C in N2 atmosphere maintains 78% 550 air 40 ± 10% relative humidity (RH). This study proposes as molecular modulator achieve efficient stable PSCs.

Language: Английский

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Incorporating MXene in Perovskite for Modulating Ion Migration and Enhancing Object Detection

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

Published: April 29, 2025

Abstract Perovskite memristors hold promise for next‐generation computing devices due to their potential in‐memory computing. However, they face challenges in practical applications owing high power consumption, limited resistance tunability, and complex conduction mechanisms primarily caused by the uncontrollable ion migrations. In this study, Ti 3 C 2 T x MXene nanosheets are incorporated into methylammonium lead iodide (MAPbI ) based memristor modulate migration behaviors of iodine (I − silver (Ag + ions. can decrease Ag ions barrier from 0.45 0.31 eV, which is induced closer lattice distance lower charge transfer thanks bridging effect between Pb 2+ surface functional groups MXene. Thus, operating voltages be achieved. On other hand, also serve as a “reservoir” accumulation I ions, leading gradual stable multiple resistive states under repeated voltage stimulations. Herein, processes considered dominate digital analog switching device, respectively, enabling both data storage neuromorphic with long retention time (>10 5 s), device uniformity, distinguishable (21 states), object detection accuracy (98.9%).

Language: Английский

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Multidimensional Modulation via Tailored Covalent Organic Frameworks Enables Stable Inverted Perovskite Solar Cells with 26.21% Efficiency

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

Published: May 15, 2025

Abstract Despite the remarkable advancements in inverted perovskite solar cells, their commercialization remains hindered by critical bottlenecks efficiency and stability stemming from inadequate crystallization unfavorable interfacial states. Herein, for first time, a judiciously designed hydrazine‐linked covalent organic framework (COF) with long alkane phosphate branch chains, named 12‐SD‐COF, is synthesized integrated into precursor to achieve multidimensional regulation of crystallization, defect states, charge separation synergistically. It found that 12‐SD‐COF featuring periodic pores, large planar structure, abundant binding groups extruded solution onto buried interface, surface, grain boundaries, facilitating oriented while eliminating defects perovskites, thereby yielding high‐quality crystals suppressed non‐radiative recombination. Simultaneously, synergistically facilitated p‐type doping‐optimized energy level alignment induced intramolecular electric field, ultimately achieving an exceptional power conversion (PCE) 26.21%, highest yet reported COF‐modified. Impressively, non‐encapsulated resultant device delivers greatly improved stabilities, maintaining over 92% initial PCE after being aged under 85 °C continuous heating stress 800 h, 1000 h 50±3% relative humidity air, 1200 1‐sun illumination, respectively.

Language: Английский

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Functional design and understanding of effective additives for achieving high-quality perovskite films and passivating surface defects

Journal of Energy Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Language: Английский

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Optimizing the light-humidity stability of formamidinium halide perovskites through intermediate phase and strain stress adjustment

Materials Today Energy, Journal Year: 2024, Volume and Issue: unknown, P. 101757 - 101757

Published: Nov. 1, 2024

Language: Английский

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