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

---

In Situ Formation of 2D Perovskite Seeding for Record‐Efficiency Indoor Perovskite Photovoltaic Devices

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(1)

Published: Sept. 28, 2023

With 40% efficiency under room light intensity, perovskite solar cells (PSCs) will be promising power supplies for low-light applications, particularly Internet of Things (IoT) devices and indoor electronics, shall they become commercialized. Herein, β-alaninamide hydrochloride (AHC) is utilized to spontaneously form a layer 2D nucleation seeds improved film uniformity, crystallization quality, cell performance. It found that the AHC addition indeed improves quality as demonstrated by better lower trap density, smaller lattice stress, and, result, 10-fold increase in charge carrier lifetime. Consequently, not only does small-area (0.09 cm

Language: Английский

---

Moisture Induced Secondary Crystal Growth Boosting the Efficiency of Hole Transport Layer‐Free Carbon‐Based Perovskite Solar Cells beyond 19.5%

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(1)

Published: Sept. 17, 2023

Abstract Hole transport layer (HTL)‐free carbon‐based perovskite solar cells (C‐PSCs) show promising commercial application potential due to their attractive advantages of low cost and high stability. However, the power conversion efficiency C‐PSCs is relatively low, mainly poor crystalline quality C‐PSC applicable films energy level mismatch between carbon electrode. Herein, a moisture‐induced secondary crystal growth strategy simultaneously improve optimize film proposed. The presence moisture renders surface grains reactive by forming metastable intermediates. It demonstrated that commonly considered harmful intermediates can trigger growth. This results in improved crystallinity, larger grain size, better morphology films, which reduce density defect states also benefit interface contact Furthermore, modulates composition achieve an optimized alignment. As result, this reduces charge recombination loss accelerates process C‐PSCs. Consequently, new record 19.52% achieved for HTL‐free

Language: Английский

---

Screen‐Printing Technology for Scale Manufacturing of Perovskite Solar Cells

Advanced Science, Journal Year: 2023, Volume and Issue: 10(28)

Published: Aug. 4, 2023

As a key contender in the field of photovoltaics, third-generation thin-film perovskite solar cells (PSCs) have gained significant research and investment interest due to their superior power conversion efficiency (PCE) great potential for large-scale production. For commercialization consideration, low-cost scalable fabrication is primary importance PSCs, development applicable film-forming techniques that meet above requirements plays role. Currently, large-area films are mainly produced by printing techniques, such as slot-die coating, inkjet printing, blade screen-printing. Among these screen offers high degree functional layer compatibility, pattern design flexibility, ability, showing promise. In this work, advanced progress on applying screen-printing technology fabricating PSCs from technique fundamentals practical applications presented. The introduced state-of-the-art studies different layers control strategies realize fully screen-printed summarized. Moreover, current challenges opportunities faced devices discussed. This work highlights critical significance throughput accelerating course products.

Language: Английский

---

Accelerating Thermal Transfer in Perovskite Films for High‐Efficiency and Stable Photovoltaics

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)

Published: Sept. 5, 2023

Abstract Heat accumulation within in‐service perovskite solar cells (PSCs) under light irradiation is one imminent threat in deteriorating the persistent power output and long‐term durability. Herein, a novel strategy reported to remove dissipated heat by improving thermal conductivity diffusivity of film with multi‐walled carbon nanotubes (MWCNTs) as additives. Benefiting from interaction between MWCNTs well accelerated transfer kinetics mediated MWCNTs, this method produces high‐quality high crystallinity reduced defects. Meanwhile, incorporation self‐cools operational temperature final PSC 42.5 38.5 °C compensate temperature‐induced performance reduction. Consequently, significantly improved efficiency 11.78% for carbon‐based CsPbIBr 2 cell, 15.14% CsPbI Br 22.13% 23.05% regular inverted (FA 0.83 MA 0.17 ) 0.95 Cs 0.05 Pb(I 0.9 0.1 3 cells, respectively, achieved. Apart larger conversion conservation rate > 94% over 2800 h air without encapsulation, optimal device demonstrates significant stability improvement nearly 1.5‐times after aging at 85 1300 40‐fold operation 350 h, providing new path high‐efficiency stable platforms.

Language: Английский

---

Tailoring Crystallization Dynamics of CsPbI₃ for Scalable Production of Efficient Inorganic Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(6)

Published: Oct. 27, 2023

Abstract All‐inorganic perovskite cesium lead triiodide (CsPbI 3 ) with inorganic nature, low‐temperature synthesis, and a suitable bandgap is desirable for high‐performance photovoltaics. However, the scalable production of CsPbI photovoltaics still challenging due to large nucleation energy barrier slow phase transition during unassisted natural crystallization. Here, crystallization dynamics thin films tailored via acetate (PbAc 2 substitution in precursor ink, allowing fabrication efficient all‐inorganic solar cells minimodules. Introducing PbAc enlarges colloid size reduces barrier. Additionally, reactions between dimethylammonium wet film accelerate removal additives generate solvent vapors self‐regulate internal annealing, resulting densely packed, uniform, pinhole‐free over areas. This strategy demonstrates inverted 20.17% efficiency good operational stability (retaining 95.5% initial after continuous operation 1800 h) 15.1%‐efficient minimodules an active area 26.8 cm .

Language: Английский

---

Ultra-large dipole moment organic cation derived 3D/2D p-n heterojunction for high-efficiency carbon-based perovskite solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(13), P. 4692 - 4702

Published: Jan. 1, 2024

The organic spacer cation with ultra-large dipole moment results in the formation of p-type 2D perovskites and 3D/2D p–n junctions. hole transport layer-free carbon-based perovskite solar cells achieve an efficiency 20.08%.

Language: Английский

---

Unraveling the Influence of Solvent on Side Reactions between Formamidinium Lead Triiodide and Methylammonium Cations

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(14), P. 10159 - 10166

Published: April 1, 2024

Formamidinium lead triiodide (FAPbI3) perovskite thin films are commonly deposited through a solution process, often incorporating specific amount of methylammonium halide to stabilize the α-phase or enhance their crystallinity. The precursor for such coatings significantly influences fabrication solar cells (PSCs), involving time-dependent aging and byproduct formation. chemical principle underlying this behavior is believed be related deprotonation methylamine cations (MA+) subsequent reactions with FA+ generate N-methylformamidinium. Nevertheless, role solvent in side between these organic remains unclear. This work systematically investigates reaction reactivity three protic solvents aprotic solvents. We uncover hidden dimethylamine from hydrolysis products N,N-dimethylformamide, promoting MA+. Additionally, we elucidate impact environmental factors, as water oxygen, stabilizing solutions. establishes basic concept scientific direction rationalizing high-efficiency, reproducible, long-term-stable PSCs.

Language: Английский

---

Ionic‐Rich Vermiculite Tailoring Dynamic Bottom‐Up Gradient for High‐Efficiency Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)

Published: April 30, 2024

Abstract Mixed‐halide perovskites are emerging as excellent photovoltaic candidates because of their tunable bandgaps for semitransparent and tandem perovskite solar cells. However, the notorious film quality originated from rapidly downward crystallization process susceptibly propagates enormous detrimental defects, which deteriorate performance accelerate halide segregation. To address this issue, herein, a multilayer alkalis‐intercalated‐vermiculite is employed pre‐buried interface modifier to regulate lattice property. The matchable structure between vermiculite by forming Pb─O bond not only releases interfacial strain during growth but also embedded alkalis ions can gradually diffuse into form favorable vertical gradient owing weak interlamellar van der Waals interaction, playing bis‐roles atomical lubricant ion‐reservoir eliminate defects. As result, stability significantly improved with suppressed phase segregation mixed‐halide perovskites, accompanying champion efficiency 11.42% carbon‐based CsPbIBr 2 device, 15.25% CsPbI Br device 23.17% p‐i‐n inverted (Cs 0.05 MA FA 0.9 )Pb(I 0.93 0.07 ) 3 cell. This work provides new strategy on buried engineering making high‐efficiency stable platforms.

Language: Английский

---

20.1% Certified Efficiency of Planar Hole Transport Layer‐Free Carbon‐Based Perovskite Solar Cells by Spacer Cation Chain Length Engineering of 2D Perovskites

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: May 31, 2024

The planar triple-layer hole transport layer (HTL)-free carbon-based perovskite solar cells (C-PSCs) have outstanding advantages of low cost and high stability, but are limited by efficiency. formation a 3D/2D heterojunction has been widely proven to enhance device performance. However, the 2D possesses multiple critical properties associated with 3D perovskite, including defect passivation, energy level, charge properties, all which can impact It is challenging find powerful means achieve comprehensive regulation trade-off these key properties. Herein, we propose chain-length engineering alkylammonium spacer cations this goal. results show that formed short-chain primarily acts passivate defects. With increase in cation chain length, achieves more matched level enhancing built-in electric field promoting separation. further length impedes due insulativity organic cations. Comprehensively, tetradecylammonium optimal balance interface separation, transport. HTL-free C-PSCs exhibit new record efficiency 20.40 % (certified 20.1 %).

Language: Английский

---