A novel and stable ultraviolet and infrared intensity sensor in impedance/capacitance modes fabricated from degraded CH3NH3PbI3-xClx perovskite materials

AbstractThe development of materials is one of the driving forces to accelerate modern scientific progress and technological innovation. Machine learning (ML) technology is rapidly developed in many fields and opening blueprints for the discovery and rational design of materials. In this review, we retrospected the latest applications of ML in assisting perovskites discovery. First, the development tendency of ML in perovskite materials publications in recent years was organized and analyzed. Second, the workflow of ML in perovskites discovery was introduced. Then the applications of ML in various properties of inorganic perovskites, hybrid organic–inorganic perovskites and double perovskites were briefly reviewed. In the end, we put forward suggestions on the future development prospects of ML in the field of perovskite materials.

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First principles investigation of physically conductive bridge filament formation of aluminum doped perovskite materials for neuromorphic memristive applications

Chaos Solitons & Fractals ◽

10.1016/j.chaos.2021.111111 ◽

2021 ◽

Vol 150 ◽

pp. 111111

Author(s):

Turki Alsuwian ◽

Farhana Kousar ◽

Umbreen Rasheed ◽

Muhammad Imran ◽

Fayyaz Hussain ◽

...

Keyword(s):

First Principles ◽

Filament Formation ◽

Perovskite Materials ◽

Conductive Bridge

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High-performance quasi-2D perovskite light-emitting diodes: from materials to devices

Light Science & Applications ◽

10.1038/s41377-021-00501-0 ◽

2021 ◽

Vol 10 (1) ◽

Cited By ~ 1

Author(s):

Li Zhang ◽

Changjiu Sun ◽

Tingwei He ◽

Yuanzhi Jiang ◽

Junli Wei ◽

...

Keyword(s):

Energy Transfer ◽

High Performance ◽

Light Emitting Diodes ◽

Structural Characteristics ◽

Quantum Yields ◽

Research Directions ◽

Light Emitting ◽

Perovskite Materials ◽

Quantum Confinement Effects ◽

Semiconducting Properties

AbstractQuasi-two-dimensional (quasi-2D) perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation light-emitting diodes (LEDs). The outstanding optical properties originate from their structural characteristics. In particular, the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectric- and quantum-confinement effects; the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields (PLQYs), particularly at low excitation intensities. The review herein presents an overview of the inherent properties of quasi-2D perovskite materials, the corresponding energy transfer and spectral tunability methodologies for thin films, as well as their application in high-performance LEDs. We then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D PeLEDs. The review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.

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Discovery and engineering of low work function perovskite materials

Journal of Materials Chemistry C ◽

10.1039/d1tc01286j ◽

2021 ◽

Author(s):

Tianyu Ma ◽

Ryan Jacobs ◽

John Booske ◽

Dane Morgan

Keyword(s):

Work Function ◽

High Throughput ◽

Cathode Materials ◽

Perovskite Materials ◽

Dft Simulations

High throughput DFT simulations yield 7 low work function perovskites as promising cathode materials.

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Recent advancements and perspectives on light management and high performance in perovskite light-emitting diodes

Nanophotonics ◽

10.1515/nanoph-2021-0033 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Shaoni Kar ◽

Nur Fadilah Jamaludin ◽

Natalia Yantara ◽

Subodh G. Mhaisalkar ◽

Wei Lin Leong

Keyword(s):

High Performance ◽

Light Propagation ◽

Light Emission ◽

Review Article ◽

Rapid Progress ◽

Light Emitting ◽

Materials Engineering ◽

Perovskite Materials ◽

Light Management ◽

Photon Recycling

Abstract Perovskite semiconductors have experienced meteoric rise in a variety of optoelectronic applications. With a strong foothold on photovoltaics, much focus now lies on their light emission applications. Rapid progress in materials engineering have led to the demonstration of external quantum efficiencies that surpass the previously established theoretical limits. However, there remains much scope to further optimize the light propagation inside the device stack through careful tailoring of the optical processes that take place at the bulk and interface levels. Photon recycling in the emitter material followed by efficient outcoupling can result in boosting external efficiencies up to 100%. In addition, the poor ambient and operational stability of these materials and devices restrict further commercialization efforts. With best operational lifetimes of only a few hours reported, there is a long way to go before perovskite LEDs can be perceived as reliable alternatives to more established technologies like organic or quantum dot-based LED devices. This review article starts with the discussions of the mechanism of luminescence in these perovskite materials and factors impacting it. It then looks at the possible routes to achieve efficient outcoupling through nanostructuring of the emitter and the substrate. Next, we analyse the instability issues of perovskite-based LEDs from a photophysical standpoint, taking into consideration the underlying phenomena pertaining to defects, and summarize recent advances in mitigating the same. Finally, we provide an outlook on the possible routes forward for the field and propose new avenues to maximally exploit the excellent light-emitting capabilities of this family of semiconductors.

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Manipulation of hot carrier cooling dynamics in two-dimensional Dion–Jacobson hybrid perovskites via Rashba band splitting

Nature Communications ◽

10.1038/s41467-021-24258-7 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jun Yin ◽

Rounak Naphade ◽

Partha Maity ◽

Luis Gutiérrez-Arzaluz ◽

Dhaifallah Almalawi ◽

...

Keyword(s):

Transient Absorption ◽

Phonon Scattering ◽

Transient Absorption Spectroscopy ◽

Band Model ◽

Two Dimensional ◽

Spintronic Devices ◽

Hot Carrier ◽

Band Splitting ◽

Perovskite Materials ◽

Spin Polarized

AbstractHot-carrier cooling processes of perovskite materials are typically described by a single parabolic band model that includes the effects of carrier-phonon scattering, hot phonon bottleneck, and Auger heating. However, little is known (if anything) about the cooling processes in which the spin-degenerate parabolic band splits into two spin-polarized bands, i.e., the Rashba band splitting effect. Here, we investigated the hot-carrier cooling processes for two slightly different compositions of two-dimensional Dion–Jacobson hybrid perovskites, namely, (3AMP)PbI4 and (4AMP)PbI4 (3AMP = 3-(aminomethyl)piperidinium; 4AMP = 4-(aminomethyl)piperidinium), using a combination of ultrafast transient absorption spectroscopy and first-principles calculations. In (4AMP)PbI4, upon Rashba band splitting, the spin-dependent scattering of hot electrons is responsible for accelerating hot-carrier cooling at longer delays. Importantly, the hot-carrier cooling of (4AMP)PbI4 can be extended by manipulating the spin state of the hot carriers. Our findings suggest a new approach for prolonging hot-carrier cooling in hybrid perovskites, which is conducive to further improving the performance of hot-carrier-based optoelectronic and spintronic devices.

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Effective mass of heavy, light, and spin split-off band electron and hole g-factor in cubic perovskite materials

Journal of Applied Physics ◽

10.1063/5.0028266 ◽

2020 ◽

Vol 128 (23) ◽

pp. 235109

Author(s):

David Ompong ◽

Godfred Inkoom ◽

Jai Singh

Keyword(s):

Effective Mass ◽

G Factor ◽

Band Electron ◽

Perovskite Materials

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Common Phase and Structure Misidentifications in High-Resolution TEM Characterization of Perovskite Materials

Condensed Matter ◽

10.3390/condmat6010001 ◽

2020 ◽

Vol 6 (1) ◽

pp. 1

Author(s):

Yu-Hao Deng

Keyword(s):

High Resolution ◽

Research Field ◽

Structure Characterization ◽

Phase Identification ◽

Lead Iodide ◽

Perovskite Materials ◽

High Resolution Tem ◽

Methylammonium Lead Iodide ◽

Dose Imaging

High-resolution TEM (HRTEM) is a powerful tool for structure characterization. However, methylammonium lead iodide (MAPbI3) perovskite is highly sensitive to electron beams and easily decomposes into lead iodide (PbI2). Misidentifications, such as PbI2 being incorrectly labeled as perovskite, are widely present in HRTEM characterization and would negatively affect the development of perovskite research field. Here misidentifications in MAPbI3 perovskite are summarized, classified, and corrected based on low-dose imaging and electron diffraction (ED) simulations. Corresponding crystallographic parameters of intrinsic tetragonal MAPbI3 and the confusable hexagonal PbI2 are presented unambiguously. Finally, the method of proper phase identification and some strategies to control the radiation damage in HRTEM are provided. This warning paves the way to avoid future misinterpretations in HRTEM characterization of perovskite and other electron beam-sensitive materials.

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