scholarly journals Microstructural Study of Two-Dimensional Organic-Inorganic Hybrid Perovskite Nanosheet Degradation under Illumination

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 722 ◽  
Author(s):  
Lingfang Nie ◽  
Xiaoxing Ke ◽  
Manling Sui
Keyword(s):  
White Light ◽  
Uv Light ◽  
Light Exposure ◽  
Optoelectronic Devices ◽  
Two Dimensional ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Transmission Electron ◽  
New Perspective ◽  
Photo Stability

Two-dimensional (2D) organic-inorganic hybrid perovskite materials have received substantial attention because of their exceptional optoelectronic properties. Although the applications of 2D perovskite nanosheets are promising in various optoelectronic devices, which all face harsh working conditions of light exposure, little is known about the photo-stability and degradation mechanisms of these 2D perovskite nanosheets. In this work, degradation of (C4H9NH3)2PbBr4 (BA2PbBr4) nanosheets when exposed to ultraviolet (UV) light and white light is explored. The morphology, optical properties, and microstructure of the nanosheets, under different conditions of light exposure, was studied in detail. UV light is more destructive compared to white light, which both led to a nanosheet breakdown. A combination of transmission electron microscopy (TEM) imaging and electron diffraction revealed that the organic moieties are most sensitive to light exposure and partial disorder toward complete disorder takes place during light exposure. Moreover, excessive light exposure further causes a [PbBr6]4− octahedron tilt and re-ordering within the perovskite structure. This study could enrich the understanding of 2D perovskite nanosheets and their photostability, offer a new perspective in interpreting the light–perovskite interaction, and further help the design of robust and light-tunable 2D perovskite-based optoelectronic devices.

Broadband white-light emission with a high color rendering index in a two-dimensional organic–inorganic hybrid perovskite

2018 ◽  
Vol 6 (5) ◽  
pp. 1171-1175 ◽  
Author(s):  
Zhenyue Wu ◽  
Chengmin Ji ◽  
Zhihua Sun ◽  
Sasa Wang ◽  
Sangen Zhao ◽  
...  
Keyword(s):  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
Two Dimensional ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Color Rendering Index ◽  
Color Rendering

Broadband white-light emission with an ultrahigh CRI of 93 based on an organic–inorganic hybrid 2D corrugated perovskite.

Inverse photoconductivity effect in triple cation organic-inorganic hybrid perovskite memristors with various iodine concentrations, electrodes, and modified layers

2022 ◽  
Author(s):  
Yucheng Wang ◽  
Yuxuan Xiong ◽  
Jian Sha ◽  
Jiyang Guo ◽  
hongsu Wang ◽  
...  
Keyword(s):  
Light Absorption ◽  
Optoelectronic Devices ◽  
Moisture Resistance ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Photo Stability ◽  
Application Prospects

With the advantages of light absorption ability, photo-stability and moisture resistance, triple cation perovskites (TCPs) have great application prospects in optoelectronic devices. Here, we reveal a novel inverse photoconductivity (IPC)...

Synthesis and characterization of novel poly(HAzPMA-co-SA)/RDX/CdS nanocomposite as a polymer bonded explosive

2020 ◽  
Vol 98 (12) ◽  
pp. 755-763
Author(s):  
Hamid Reza Ghayeni ◽  
Reza Razeghi ◽  
Abolfazl Olyaei
Keyword(s):  
Uv Light ◽  
Light Exposure ◽  
Sodium Acrylate ◽  
Spectroscopic Techniques ◽  
Effective Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cds Nanorods ◽  
Transmission Electron

Cadmium sulfide nanorods with a length of 69 nm have been prepared by using Cd(OAc)2.2H2O and S8 at 125 °C in the presence of triethylenetetramine as the template agent and coordination agent and characterized by using X-ray diffraction, transmission electron microscopy, FTIR, photoluminescence, and UV–vis absorption spectroscopic techniques. Photocopolymerization of glycidyl methacrylate (GMA) and sodium acrylate (SA) was carried out using CdS nanorods as a photocatalyst under UV light exposure at 400 nm in the presence of β-cyclodextrin (β-CD). To optimization of the effective parameters on the synthesis of copolymer nanocomposite, the amounts of initiator, monomers, and β-CD, duration of pre-deoxygenation, and light wavelength were evaluated. Ring opening of poly(GMA-co-SA)/CdS nanocomposite with NaN3 afforded poly(HAzPMA-co-SA)/CdS nanocomposite and subsequent mixing with RDX in DMF led to the formation of poly(HAzPMA-co-SA)/RDX/CdS nanocomposite as a polymer bonded explosive. All of the copolymer nanocomposites were characterized using various tools of instrumental analysis.

scholarly journals Quantum dots of two-dimensional Ruddlesden–Popper organic–inorganic hybrid perovskite with high optical limiting properties

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045130 ◽  
Author(s):  
Sreekanth J. Varma ◽  
Jayesh Cherusseri ◽  
Jinxin Li ◽  
Jitesh Kumar ◽  
Elizabeth Barrios ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Limiting ◽  
Two Dimensional ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite

scholarly journals A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 83 ◽  
Author(s):  
Edward Guangqing Tai ◽  
Ryan Taoran Wang ◽  
Jason Yuanzhe Chen ◽  
Gu Xu
Keyword(s):  
Solar Cells ◽  
Uv Light ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Bandgap Energy ◽  
Lead Iodide ◽  
Perovskite Layer ◽  
Rapid Degradation ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite

Organic-inorganic hybrid halide perovskite solar cells (PSCs) have been a trending topic in recent years. Significant progress has been made to increase their power conversion efficiency (PCE) to more than 20%. However, the poor stability of PSCs in both working and non-working conditions results in rapid degradation through multiple environmental erosions such as water, heat, and UV light. Attempts have been made to resolve the rapid-degradation problems, including formula changes, transport layer improvements, and encapsulations, but none of these have effectively resolved the dilemma. This paper reports our findings on adding inorganic films as surface-passivation layers on top of the hybrid perovskite materials, which not only enhance stability by eliminating weak sites but also prevent water penetration by using a water-stable layer. The surface-passivated hybrid perovskite layer indicates a slight increase of bandgap energy (Eg=1.76 eV), compared to the original methylammonium lead iodide (MAPbI3, Eg=1.61 eV) layer, allowing for more stable perovskite layer with a small sacrifice in the photoluminescence property, which represents a lower charge diffusion rate and higher bandgap energy. Our finding offers an alternative approach to resolving the low stability issue for PSC fabrication.

Atomic Layer Dependence of Shear Modulus in a Two-Dimensional Single-Crystal Organic–Inorganic Hybrid Perovskite

2019 ◽  
Vol 123 (24) ◽  
pp. 15251-15257 ◽  
Author(s):  
Qikun Li ◽  
Sheng Bi ◽  
Jingyuan Bu ◽  
Chaolong Tang ◽  
Zhongliang Ouyang ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Single Crystal ◽  
Atomic Layer ◽  
Two Dimensional ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite

Tailoring nucleation and grain growth by changing the precursor phase ratio for efficient organic lead halide perovskite optoelectronic devices

2017 ◽  
Vol 5 (39) ◽  
pp. 10114-10121 ◽  
Author(s):  
Swaminathan Venkatesan ◽  
Mehedhi Hasan ◽  
Junyoung Kim ◽  
Nader R. Rady ◽  
Sandeep Sohal ◽  
...  
Keyword(s):  
Grain Growth ◽  
Optoelectronic Devices ◽  
Nucleation And Growth ◽  
Molar Ratio ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Precursor Phase ◽  
Organic Lead ◽  
Halide Perovskite ◽  
Lead Halide

The nucleation and growth of organic–inorganic hybrid perovskite films induced by the molar ratio of precursor components and their role in optoelectronic performance are investigated.

scholarly journals Growth and Mechanism of MoS2Nanoflowers with Ultrathin Nanosheets

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Yifei Guo ◽  
Xiuli Fu ◽  
Zhijian Peng
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Optoelectronic Devices ◽  
Chemical Vapor ◽  
Silicon Substrates ◽  
Optical And Electrical Properties ◽  
Two Dimensional ◽  
Ultrathin Nanosheets ◽  
Transmission Electron ◽  
Composition And Structure

Two-dimensional molybdenum disulfide (MoS2) with few layers, due to their excellent optical and electrical properties, has great potential for applications in electronic and optoelectronic devices. In this work, flower-like MoS2nanostructures with ultrathin nanosheets (petals) were successfully deposited onto silicon substrates by a facile process based on chemical vapor deposition via using MoO3and S powders as starting materials. Their composition and structure were explored by field emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and photoluminescence. The reported nanoflowers vertically and separately stood on the substrates, consisting of several bonded MoS2nanosheets with a thickness of 10–30 nm and high crystallinity. On the basis of these results, a growth mechanism for the MoS2nanoflowers was proposed.

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