scholarly journals Effect of static local distortions vs. dynamic motions on the stability and band gaps of cubic oxide and halide perovskites

2021 ◽  
Author(s):  
Xin-Gang Zhao ◽  
Zhi Wang ◽  
Oleksandr I. Malyi ◽  
Alex Zunger
Keyword(s):  
Band Gaps ◽  
Halide Perovskites ◽  
The Stability ◽  
Local Distortions

scholarly journals Nonempirical hybrid functionals for band gaps of inorganic metal-halide perovskites

2019 ◽  
Vol 3 (12) ◽  
Author(s):  
Thomas Bischoff ◽  
Julia Wiktor ◽  
Wei Chen ◽  
Alfredo Pasquarello
Keyword(s):  
Metal Halide ◽  
Band Gaps ◽  
Halide Perovskites ◽  
Hybrid Functionals

scholarly journals Exploring the Structural Competition between the Black and the Yellow Phase of CsPbI3

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1282
Author(s):  
Ioannis Deretzis ◽  
Corrado Bongiorno ◽  
Giovanni Mannino ◽  
Emanuele Smecca ◽  
Salvatore Sanzaro ◽  
...  
Keyword(s):  
Perovskite Phase ◽  
Low Cost ◽  
Δ Phase ◽  
Nanocrystalline Structures ◽  
Halide Perovskites ◽  
The Stability ◽  
Structural Competition ◽  
Lead Halide ◽  
Main Candidate ◽  
Spontaneous Phase

The realization of stable inorganic perovskites is crucial to enable low-cost solution-processed photovoltaics. However, the main candidate material, CsPbI3, suffers from a spontaneous phase transition at room temperature towards a photo-inactive orthorhombic δ-phase (yellow phase). Here we used theoretical and experimental methods to study the structural and electronic features that determine the stability of the CsPbI3 perovskite. We argued that the two physical characteristics that favor the black perovskite phase at low temperatures are the strong spatial confinement in nanocrystalline structures and the level of electron doping in the material. Within this context, we discussed practical procedures for the realization of long-lasting inorganic lead halide perovskites.

Novel Design Strategies for Perovskite Materials with Improved Stability and Suitable Band Gaps

2021 ◽  
Author(s):  
Bing Zhang ◽  
Xiaogang Wang ◽  
Yang Yang ◽  
Lei Tong ◽  
Bin Hu ◽  
...  
Keyword(s):  
Solar Cell ◽  
Band Gaps ◽  
Current Work ◽  
Design Strategies ◽  
Perovskite Materials ◽  
Improved Stability ◽  
Halide Perovskites ◽  
Novel Design

The instability of organometallic halide perovskites is deemed a key hindrance hampering their commercial utilization in solar cell research. In the current work, we investigate and compare the dynamics properties...

scholarly journals Tailoring capping-layer composition for improved stability of mixed-halide perovskites

2022 ◽  
Author(s):  
Noor Titan Putri Hartono ◽  
Marie-Hélène Tremblay ◽  
Sarah Wieghold ◽  
Benjia Dou ◽  
Janak Thapa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Capping Layer ◽  
Improved Stability ◽  
Halide Perovskites ◽  
The Stability ◽  
Low Dimensional ◽  
Layer Composition

Incorporating a low dimensional (LD) perovskite capping layer on top of perovskite absorber, improves the stability of perovskite solar cells (PSCs). However, in the case of mixed-halide perovskites, which can...

scholarly journals Poly(catecholamine) Coating and Biofunctionalization of CsPbBr3 Microcrystals

2021 ◽  
Author(s):  
Sangyeon Cho ◽  
Seok-Hyun Yun
Keyword(s):  
Lipid Bilayers ◽  
Environmental Stability ◽  
Live Cells ◽  
Functional Coatings ◽  
Common Strategy ◽  
Novel Method ◽  
Halide Perovskites ◽  
The Stability ◽  
New Applications

<p>Lead halide perovskites (LHP) microcrystals are promising materials for various optoelectronic applications. Surface coating on particles is a common strategy to improve their functionality and environmental stability, but LHP is not amenable to most coating chemistries because of its intrinsic weakness against polar solvents. Here, we describe a novel method of synthesizing LHP microcrystals in a super-saturated polar solvent using sonochemistry and applying various functional coatings on individual microcrystals <i>in situ</i>. We synthesize cesium lead bromine perovskite (CsPbBr<sub>3</sub>) microparticles capped with organic poly-norepinephrine (pNE) layers. The catechol group of pNE coordinates to bromine-deficient lead atoms, forming a defect-passivating and diffusion-blocking shell. The pNE layer enhances the stability of CsPbBr<sub>3</sub> in water by 2,000-folds, enabling bright luminescence and lasing from single microcrystals in water. Furthermore, the pNE shell permits biofunctionalization with proteins, small molecules, and lipid bilayers. Luminescence from CsPbBr<sub>3</sub> microcrystals is sustained in water over 1 hour and observed in live cells. The functionalization method may enable new applications of LHP particles in water-rich environments.<b></b></p>

scholarly journals Enhanced Luminescence and Mechanistic Studies on Mn-doped Double Layered Perovskite Phosphors: Cs4Mn1−xCdxBi2Cl12

2020 ◽  
Author(s):  
Brenda Vargas ◽  
Diana T. Reyes-Castillo ◽  
Eduardo Coutino-Gonzalez ◽  
Citlali Sánchez-Aké ◽  
Carlos Ramos ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Layered Perovskite ◽  
Great Promise ◽  
New Family ◽  
Halide Perovskites ◽  
Optoelectronic Applications ◽  
The Stability ◽  
Low Dimensional ◽  
Stability Issues ◽  
Mn Doped

Halide perovskites offer great promise for optoelectronic applications, but stability issues continue to hinder its implementation and long-term stability. The stability of all-inorganic halide perovskites and the inherent quantum confinement of low dimensional perovskites can be harnessed to synthesize materials with high PL efficiency. An example of such materials is the recently reported new family of layered double perovskites, Cs4Mn1−xCdxBi2Cl12. Herein, we report a new synthetic procedure that enhances the maximum PLQY of this family materials to up 79.5%, a 20% enhancement from previous reports and the highest reported for a Mn-doped halide perovskite. Importantly, stability tests demonstrate that these materials are very stable towards humidity, UV irradiation, and temperature. Finally, we investigated the photophysics, the effects of magnetic coupling and temperature in the PL efficiency and proposed a mechanism for the emission process. Our results highlight the potential of this family of materials and related layered all-inorganic perovskites for solid-state lighting and optoelectronic applications<p></p>

scholarly journals Addressing the Stability of Lead Halide Perovskites

Joule ◽  
2020 ◽  
Vol 4 (8) ◽  
pp. 1626-1627 ◽  
Author(s):  
Matthew L. Davies
Keyword(s):  
Halide Perovskites ◽  
The Stability ◽  
Lead Halide

Metal halide perovskites: stability and sensing-ability

2018 ◽  
Vol 6 (38) ◽  
pp. 10121-10137 ◽  
Author(s):  
Zhaohua Zhu ◽  
Qian Sun ◽  
Zhipeng Zhang ◽  
Jie Dai ◽  
Guichuan Xing ◽  
...  
Keyword(s):  
Metal Halide ◽  
Mechanistic Studies ◽  
External Perturbations ◽  
Halide Perovskites ◽  
The Stability

We review the investigations and mechanistic studies on the stability of metal-halide perovskites under external perturbations, and highlight recent attempts to apply them as sensors.

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