Higher quantum efficiency and moisture resistance of all-inorganic halide perovskite nanocrystal films in situ fabricated with cyclodextrin

2019 ◽  
Vol 55 (79) ◽  
pp. 11916-11919 ◽  
Author(s):  
Zhou-Kun Zhou ◽  
Zhi-Hong Mo ◽  
Xiao-Lan Wei
Keyword(s):  
Quantum Efficiency ◽  
Moisture Resistance ◽  
Smooth Film ◽  
Nanocrystal Films ◽  
Halide Perovskite

β-Cyclodextrin confines the growth of CsPbBr3 nanocrystals, generating a smooth film with a higher quantum efficiency and a longer moisture resistance.

scholarly journals Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chenhui Wang ◽  
Dengbao Han ◽  
Junhui Wang ◽  
Yingguo Yang ◽  
Xinyue Liu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Light Emitting ◽  
Mixed Ligands ◽  
Dimension Control ◽  
Nanocrystal Films ◽  
Width Distribution ◽  
Quantum Well Width

AbstractIn the field of perovskite light-emitting diodes (PeLEDs), the performance of blue emissive electroluminescence devices lags behind the other counterparts due to the lack of fabrication methodology. Herein, we demonstrate the in situ fabrication of CsPbClBr2 nanocrystal films by using mixed ligands of 2-phenylethanamine bromide (PEABr) and 3,3-diphenylpropylamine bromide (DPPABr). PEABr dominates the formation of quasi-two-dimensional perovskites with small-n domains, while DPPABr induces the formation of large-n domains. Strong blue emission at 470 nm with a photoluminescence quantum yield up to 60% was obtained by mixing the two ligands due to the formation of a narrower quantum-well width distribution. Based on such films, efficient blue PeLEDs with a maximum external quantum efficiency of 8.8% were achieved at 473 nm. Furthermore, we illustrate that the use of dual-ligand with respective tendency of forming small-n and large-n domains is a versatile strategy to achieve narrow quantum-well width distribution for photoluminescence enhancement.

scholarly journals In-situ observation of trapped carriers in organic metal halide perovskite films with ultra-fast temporal and ultra-high energetic resolutions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kanishka Kobbekaduwa ◽  
Shreetu Shrestha ◽  
Pan Adhikari ◽  
Exian Liu ◽  
Lawrence Coleman ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
High Energy Resolution ◽  
In Situ Observation ◽  
Trap States ◽  
Tunneling Mechanism ◽  
Photocurrent Spectroscopy ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

AbstractWe in-situ observe the ultrafast dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films by ultrafast photocurrent spectroscopy with a sub-25 picosecond time resolution. Upon ultrafast laser excitation, trapped carriers follow a phonon assisted tunneling mechanism and a hopping transport mechanism along ultra-shallow to shallow trap states ranging from 1.72–11.51 millielectronvolts and is demonstrated by time-dependent and independent activation energies. Using temperature as an energetic ruler, we map trap states with ultra-high energy resolution down to < 0.01 millielectronvolt. In addition to carrier mobility of ~4 cm2V−1s−1 and lifetime of ~1 nanosecond, we validate the above transport mechanisms by highlighting trap state dynamics, including trapping rates, de-trapping rates and trap properties, such as trap density, trap levels, and capture-cross sections. In this work we establish a foundation for trap dynamics in high defect-tolerant perovskites with ultra-fast temporal and ultra-high energetic resolution.

In Situ TEM Analysis of Organic–Inorganic Metal-Halide Perovskite Solar Cells under Electrical Bias

Nano Letters ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 7013-7018 ◽  
Author(s):  
Quentin Jeangros ◽  
Martial Duchamp ◽  
Jérémie Werner ◽  
Maximilian Kruth ◽  
Rafal E. Dunin-Borkowski ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Metal Halide ◽  
In Situ Tem ◽  
Tem Analysis ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
Electrical Bias

Combined in Situ Photoluminescence and X-ray Scattering Reveals Defect Formation in Lead-Halide Perovskite Films

2021 ◽  
pp. 10156-10162
Author(s):  
Nada Mrkyvkova ◽  
Vladimír Held ◽  
Peter Nádaždy ◽  
Riyas Subair ◽  
Eva Majkova ◽  
...  
Keyword(s):  
Defect Formation ◽  
X Ray ◽  
X Ray Scattering ◽  
Halide Perovskite ◽  
Lead Halide ◽  
Ray Scattering

scholarly journals Nanocrystals perovskites photocatalyzed singlet oxygen generation for light-driven organic reactions

2021 ◽  
Author(s):  
Marco Corti ◽  
Rossella Chiara ◽  
Lidia Romani ◽  
Barbara Mannucci ◽  
Lorenzo Malavasi ◽  
...  
Keyword(s):  
Diels Alder ◽  
Organic Reactions ◽  
Hydroxy Ketone ◽  
Oxidation Reactions ◽  
Perovskite Nanocrystals ◽  
Oxygen Generation ◽  
Unsaturated Ketones ◽  
Halide Perovskite ◽  
Lead Halide

AbstractLead halide perovskite nanocrystals were prepared and used as photocatalysts for the in situ 1O2 generation to perform hetero Diels–Alder, ene and oxidation reactions with suitable dienes and alkenes. The methodology has been reasonably standardized and made applicable to a variety of olefinic substrates. The scope of the method is finely illustrated by the results in all the tested reactions, which allowed to obtain desymmetrized hydroxy-ketone derivatives, unsaturated ketones and epoxides. Some limitations were also observed especially in the case of the alkene oxidations as well as poor chemoselectivity was somewhere observed. Graphic abstract 1O2 generated by lead halide perovskite nanocrystals as photocatalyst in organic reactions.

The in situ quantum efficiency of natural phytoplankton populations

1975 ◽  
Vol 20 (6) ◽  
pp. 976-980 ◽  
Author(s):  
John E. Tyler
Keyword(s):  
Quantum Efficiency ◽  
Natural Phytoplankton

scholarly journals Fiber‐Spinning‐Chemistry Method toward In Situ Generation of Highly Stable Halide Perovskite Nanocrystals

2019 ◽  
Vol 6 (22) ◽  
pp. 1901694 ◽  
Author(s):  
Xuan Lu ◽  
Yang Hu ◽  
Jiazhuang Guo ◽  
Cai‐Feng Wang ◽  
Su Chen
Keyword(s):  
Fiber Spinning ◽  
Perovskite Nanocrystals ◽  
Chemistry Method ◽  
Halide Perovskite ◽  
In Situ Generation

scholarly journals Stability of Halide Perovskite Solar Cell Devices: In Situ Observation of Oxygen Diffusion under Biasing

2018 ◽  
Vol 30 (39) ◽  
pp. 1802769 ◽  
Author(s):  
Hee Joon Jung ◽  
Daehan Kim ◽  
Sungkyu Kim ◽  
Joonsuk Park ◽  
Vinayak P. Dravid ◽  
...  
Keyword(s):  
Solar Cell ◽  
Oxygen Diffusion ◽  
Perovskite Solar Cell ◽  
In Situ Observation ◽  
Halide Perovskite
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