Improved Conductivity of 2D Perovskite Capping Layer for Realizing High-Performance 3D/2D Heterostructured Hole Transport Layer-Free Perovskite Photovoltaics

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Perovskite solar cells (PSCs) have emerged as low-cost photovoltaic representatives. Constructing three-dimensional (3D)/two-dimensional (2D) perovskite heterostructures has been shown to effectively enhance the efficiency and stability of PSCs. However, further enhancement device performance is still largely limited by inferior conductivity 2D capping layer its mismatched energy level with 3D layer. Here, we developed an effective surface modification strategy via synergically incorporating inorganic high valence-state niobium ion (Nb5+) metal dopants organic ammonium halide salts in situ construct a high-quality on top underlying As result, was enhanced 43%, barrier between layers favorably reduced, built-in electric field 3D/2D heterostructured stacks enlarged. In addition, also reduced defect densities up 29%, verified space-charge-limited-current (SCLC) tests. Benefiting from facilitated charge extraction suppressed non-radiative recombination, blade-coated hole transport layer-free PSCs based this optimized film achieved 23.2%, ∼19% higher than that control (19.5%), which represented one best-performing simplified architecture fabricated scalable fabrication technique. The modified perovskite-based exhibited improved operational stability.

Язык: Английский

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2D/3D heterojunction engineering for hole transport layer‐free carbon‐based perovskite solar cells

ChemSusChem, Год журнала: 2025, Номер unknown

Опубликована: Янв. 24, 2025

Hole transport layer (HTL)-free carbon-based perovskite solar cells (C-PSCs) own outstanding potential for commercial applications due to their attractive advantages of low cost and superior stability. However, the abundant defects mismatched energy levels at interface perovskite/carbon electrode severely limit device efficiency Constructing a 2D on surface 3D films form 2D/3D heterojunctions has been demonstrated be an effective method passivating optimizing level alignment in almost all kinds PSCs. Due unique structure HTL-free C-PSCs, play especially important roles. This review article summarizes reports C-PSCs. It describes contributions terms roles defect passivation, optimization, stability improvement. Finally, challenges prospects heterojunction further development C-PSCs are highlighted.

Язык: Английский

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Constructing n/n⁻ Type Perovskite Homojunctions to Achieve High‐Efficiency and Stable Printable Mesoscopic Perovskite Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

Abstract In recent years, carbon‐based printable mesoscopic perovskite solar cells (p‐MPSCs) without hole transport layers have garnered considerable interest because of their outstanding benefits in terms stability and cost. However, the use carbon electrodes instead materials noble metal leads to energy level mismatch, which limits power conversion efficiency (PCE) p‐MPSCs. this work, a molecular doping strategy is proposed employing cyclopentylmethanamine passivate surface subsurface crystal defects while inducing an shift toward p‐type region within electrodes. This approach facilitates formation homojunction at micro‐interfaces between perovskites. Results demonstrate that optimizes internal alignment devices, thereby increasing driving force for transfer Ultimately, devices optimized through increase PCE from 17.50% 19.50% retaining over 92% initial after 150 days air ambiance. study provides straightforward effective designing high‐efficiency stable

Язык: Английский

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Breaking down the confinement effect on perovskite growth to fabricate efficient, carbon electrode-based mesoscopic perovskite solar cells via low-temperature and all-air procedures

Journal of Materials Chemistry C, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The confinement effect of PVSK growth is broken down by newly released micron-sized carbon-black spheres (CBSs), helping achieve a power conversion efficiency 16.28% and T80 ∼690 h during Q-MPPT test for mesoscopic perovskite solar cells.

Язык: Английский

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Carbon-Based Hole Transport Layer-Free Perovskite Solar Cells with an Efficiency beyond 18% Boosted by a Methylammonium Chloride Additive

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Carbon-based perovskite solar cells (C-PSCs) hold great prospects for commercialization due to their lower manufacturing cost and better stability when compared with metal electrode perovskite. Nevertheless, power conversion efficiency (PCE) is than those of metal-based because the inadequate interface contact between carbon layer. In this study, hole transport layer (HTL)-free carbon-based configuration utilized further reduce cost, methylammonium chloride (MACl) additive introduced passivate defects enhance performance. The results indicate that MACl can improve crystal quality film, density defect states, fill vacancies iodide ion, inhibit formation δ-phase. optimized C-PSC exhibits an increased carrier lifetime, resulting in improved PCE, a champion 18.04%. Additionally, device demonstrates ultrahigh photoelectrical during continuous light illumination. unpackaged retained 80% its initial PCE after being operated 1000 h under double 85 conditions (i.e., at relative humidity (RH) °C). This work provides extremely effective strategy optimizing perovskites preventing δ-phase, thereby leading more efficient stable optoelectronic devices.

Язык: Английский

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Interface-oriented bridges toward efficient carbon-based perovskite solar cells

Nanoscale, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The perovskite/electron transport layer interface plays a critical role in perovskite solar cell (PSC) performance and stability. Here, we report potassium bisaccharate (PB) acting as multifunctional interfacial chemical bridge at the between electron on introducing it into buried interface. carboxyl group one end of molecule is anchored to hydroxy-rich SnO2 surface through covalent interactions, stabilizing its out-of-plane orientation, other reduces non-radiative recombination by passivating under-coordinated Pb2+ perovskite. Sum-frequency generation (SFG) spectra confirm orientations optimize energy level alignment. Carbon-based PSCs treated with PB achieve champion PCE 19.69% (active area: 0.04 cm2) retain 95.8% their initial efficiency after 1200 h under ambient conditions. These results demonstrate promising modifier enhance long-term stability carbon-based PSCs.

Язык: Английский

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Enhanced Performance and Stability of Perovskite Solar Cells Through Modification of SnO₂ Electron Transport Layer with Stable Conformation Surfactant

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

Abstract Uncontrolled deposition of tin oxide (SnO 2 ) colloidal nanoparticles and perovskite precursors poses challenges for improving the efficiency stability solar cells (PSCs). Modifying electron transport layer (ETL) can both enhance its own performance influence crystallization kinetics upper layer. This study incorporates chain‐like surfactants with spatially opposite charges ETL modification. It is found that molecular conformational changes induced by flexibility carbon chain lead to collapse urchin‐like structure, impacting passivation effect SnO deposition. Due more stable conformation short‐chain surfactant, fully extended chains in micelles form a establishing stronger aggregation barrier ensures uniform The ordered distribution molecules allows functional groups be exposed on surface facilitates interlayer approach enhances across layers, alleviates interfacial tensile stress, promotes contact, extends processing window perovskite, thereby ensuring high‐performance PSCs. Ultimately, an optimized substrate strategy increases PSC device from 22.21% 24.12%, greatly improves unencapsulated under various conditions, providing new option modification engineering.

Язык: Английский

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Increase the Long‐Wavelength Absorption for Carbon‐Electrode Based Hole‐Conductor‐Free Perovskite Solar Cells by Thicker Perovskite Films

Small Methods, Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Abstract Weak reflectivity of carbon‐electrode (CE) limits light harvesting perovskite solar cells that are based on CEs (CPSCs), especially for long‐wavelength region. To solve this problem, herein the crystallization (PVSK) is regulated by tuning concentration PbI 2 precursor during two‐step growth method. As increases from 1.0 to 1.7 mol L −1 , film thickness PVSK rises ≈360 ≈850 nm, and average grain/crystallite size enlarges 0.70 1.14 µm, 54.2 67.5 respectively. Due upgraded crystallization, Urbach energy drops 98 41 meV, lifetime charge carriers obviously, meanwhile improved regions (600–810 nm). External quantum efficiency test CPSCs shows integrated short circuit current density ( J SC ) 15.6% Accordingly, improves 20.27 (±0.36) 22.58 (±0.27) mA cm −2 . Besides, leakage retarded, open‐circuit voltage improved. These merits help elevate power conversion 15.37 (±0.42) 16.37 (±0.68) % (optimized at 17.69%). Prolonging spin‐time further harvest, which optimizes device 19.17%.

Язык: Английский

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Reducing the Voc Loss of Hole Transport Layer-Free Carbon-Based Perovskite Solar Cells via Dual Interfacial Passivation

Nano-Micro Letters, Год журнала: 2025, Номер 17(1)

Опубликована: Май 19, 2025

Abstract The hole transport layer (HTL)-free carbon-based perovskite solar cells (C-PSCs) are promising for commercialization owing to their excellent operational stability and simple fabrication process. However, the power conversion efficiencies (PCE) of C-PSCs inferior metal electrode-based devices due open-circuit voltage ( V oc ) loss. Herein, time-resolved confocal photoluminescence microscopy reveals that grain boundary defects at perovskite/carbon interface very likely function as nonradiative recombination centers in HTL-free C-PSCs. A versatile additive Li 2 CO 3 is used modify conformal tin oxide electron modification can result enhanced charge extraction optimized energy alignment layer/perovskite interface, well suppressed top surface -induced formation PbI crystallites. Such dual interfacial passivation ultimately leads significantly improved up 1.142 V, which comparable with HTL. Moreover, a record-high PCE 33.2% achieved -modified under weak light illumination conditions, demonstrating indoor photovoltaic performance. This work provides practical approach fabricate low-cost, highly efficient cells.

Язык: Английский

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Perovskite Solar Cells and Light Emitting Diodes: Materials Chemistry, Device Physics and Relationship

Chemical Reviews, Год журнала: 2025, Номер unknown

Опубликована: Май 21, 2025

Solution-processed perovskite solar cells (PSCs) and light emitting diodes (PeLEDs) represent promising next-generation optoelectronic technologies. This Review summarizes recent advancements in the application of metal halide materials for PSC PeLED devices to address efficiency, stability scalability issues. Emphasis is placed on material chemistry strategies used control engineer composition, deposition process, interface micro-nanostructure solution-processed films, leading high-quality crystalline thin films optimal device performance. Furthermore, we retrospectively compare physics PSCs PeLEDs, their working principles energy loss mechanisms, examining similarities differences between two types devices. The reciprocity relationship suggests that a great should also be PeLED, motivating search interconverting photoelectric bifunctional with maximum radiative recombination negligible non-radiative recombination. Specific requirements PeLEDs terms bandgap, thickness, band alignment charge transport achieve this target are discussed detail. Further challenges issues illustrated, together prospects future development. Understanding these fundamentals, embracing breakthroughs exploring pave way toward rational design development high-performance

Язык: Английский

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