scholarly journals Improved One- and Multiple-Photon Excited Photoluminescence from Cd2+-Doped CsPbBr3 Perovskite NCs

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 151
Author(s):  
Ivan D. Skurlov ◽  
Wenxu Yin ◽  
Azat O. Ismagilov ◽  
Anton N. Tcypkin ◽  
Haohang Hua ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Metal Halide ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Trap States ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
Optical Applications

Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+ doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3 NCs. Cd2+ doping results in a two-photon absorption cross-section, reaching 2.6 × 106 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3 NCs.

scholarly journals Cooperative enhancement versus additivity of two-photon-absorption cross sections in linear and branched squaraine superchromophores

2016 ◽  
Vol 18 (24) ◽  
pp. 16404-16413 ◽  
Author(s):  
Harald Ceymann ◽  
Arnulf Rosspeintner ◽  
Maximilian H. Schreck ◽  
Carina Mützel ◽  
Andreas Stoy ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Squaraine Dyes ◽  
Two Photon

Our investigation of the nonlinear optical properties of a series of oligomeric squaraine dyes showed enhanced cross sections for linear oligomers but only additivity for branched systems.

Nonlinear optical properties of metal halide perovskite single crystals

2020 ◽  
Author(s):  
Christian Kriso ◽  
Markus Stein ◽  
Tobias Haeger ◽  
Neda Pourdavoud ◽  
Marina Gerhard ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystals ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Metal Halide ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

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.

Ligand Dependent Growth and Optical Properties of Hybrid Organo-metal Halide Perovskite Magic Sized Clusters

2019 ◽  
Vol 123 (30) ◽  
pp. 18746-18752 ◽  
Author(s):  
Evan T. Vickers ◽  
Ke Xu ◽  
Benjamin W. Dreskin ◽  
Thomas A. Graham ◽  
Xueming Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metal Halide ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
Dependent Growth

Broadband ultrafast nonlinear optical studies revealing exciting multi-photon absorption coefficients in phase pure zero-dimensional Cs4PbBr6 perovskite films

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 945-954 ◽  
Author(s):  
K. N. Krishnakanth ◽  
Sudipta Seth ◽  
Anunay Samanta ◽  
S. Venugopal Rao
Keyword(s):  
Cross Sections ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Absorption Coefficients ◽  
Optical Studies ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Phase Pure ◽  
Halide Perovskite ◽  
Lead Halide

Lead halide perovskite nanocrystals have recently demonstrated promising nonlinear optical properties such as strong two-photon absorption, three-photon absorption, four-photon absorption and their respective cross-sections.

scholarly journals Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells

Science ◽  
2020 ◽  
Vol 367 (6484) ◽  
pp. 1352-1358 ◽  
Author(s):  
Zhenyi Ni ◽  
Chunxiong Bao ◽  
Ye Liu ◽  
Qi Jiang ◽  
Wu-Qiang Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Single Crystals ◽  
Surface Passivation ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Metal Halide ◽  
Trap States ◽  
Deep Traps ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

We report the profiling of spatial and energetic distributions of trap states in metal halide perovskite single-crystalline and polycrystalline solar cells. The trap densities in single crystals varied by five orders of magnitude, with a lowest value of 2 × 1011 per cubic centimeter and most of the deep traps located at crystal surfaces. The charge trap densities of all depths of the interfaces of the polycrystalline films were one to two orders of magnitude greater than that of the film interior, and the trap density at the film interior was still two to three orders of magnitude greater than that in high-quality single crystals. Suprisingly, after surface passivation, most deep traps were detected near the interface of perovskites and hole transport layers, where a large density of nanocrystals were embedded, limiting the efficiency of solar cells.

scholarly journals Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

2019 ◽  
Vol 119 (5) ◽  
pp. 3296-3348 ◽  
Author(s):  
Javad Shamsi ◽  
Alexander S. Urban ◽  
Muhammad Imran ◽  
Luca De Trizio ◽  
Liberato Manna
Keyword(s):  
Optical Properties ◽  
Metal Halide ◽  
Perovskite Nanocrystals ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
Post Synthesis

RELATIONSHIP OF MOLECULAR STRUCTURE TO NONLINEAR OPTICAL PROPERTIES OF ORGANIC HETEROCYCLIC COMPOUNDS

2008 ◽  
Vol 17 (03) ◽  
pp. 275-283 ◽  
Author(s):  
YING HU ◽  
EVGENY O. DANILOV ◽  
BRIGITTE WEX ◽  
DOUGLAS C. NECKERS
Keyword(s):  
Molecular Structure ◽  
Optical Properties ◽  
Heterocyclic Compounds ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Nonlinear Susceptibility ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon

The nonlinear optical properties of heterocyclic compounds (1-7) were investigated. π-Centers benzo[1,2-b:4,3-b']dithiophene (1) and trithia[5]helicene (5) were studied. Compounds 2-4, 6 and 7 possess either donor-π (D-π) or donor-π-acceptor (D-π-A) structures. The optimized geometry of 7 shows a 3D helical structure. Two-photon absorption cross-sections related to the third-order nonlinear susceptibility were measured using open-aperture Z-scan techniques. Compound 7 has a two-photon absorption cross-section of 103 GM when excited at 720 nm. Important molecular structure-nonlinear optical property relationships are formulated.

Role of Spacer Cations and Structural Distortion in Two-Dimensional Germanium Halide Perovskites

2021 ◽  
Author(s):  
Lorenzo Malavasi ◽  
Luca Bindi ◽  
Mauro Coduri ◽  
Filippo De Angelis ◽  
Francesco Fracassi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metal Halide ◽  
Structural Distortion ◽  
Two Dimensional ◽  
Structure Property ◽  
Structural Distortions ◽  
Metal Halide Perovskite ◽  
Halide Perovskites ◽  
Halide Perovskite

The elucidation of the structure-property correlation in 2D metal halide perovskite is a key issue to understand the dependence of optical properties on structural distortions and to design novel tailored...

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