Layer number dependent exciton dissociation and carrier recombination in 2D Ruddlesden-Popper halide perovskites

2021 ◽  
Author(s):  
Junlin Lu ◽  
Weijian Chen ◽  
Chunhua Zhou ◽  
Shuang Yang ◽  
Chong Wang ◽  
...  
Keyword(s):  
Binding Energies ◽  
Two Dimensional ◽  
Exciton Dissociation ◽  
Layer Number ◽  
Carrier Recombination ◽  
Number Of Layers ◽  
Halide Perovskites ◽  
Recombination Dynamics

It has been a consensus that the exciton binding energies in two-dimensional (2D) Ruddlesden-Popper perovskites is closely correlated to their number of layers. However, the detailed recombination dynamics of excitons...

Investigating Entropy Generation in a Thermal Cloak Corresponding Different Material Layer Number

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Haochun Zhang ◽  
Guoqiang Xu ◽  
Haiyan Yu ◽  
Yao Li ◽  
Yanqiang Wei
Keyword(s):  
Entropy Generation ◽  
Thermal Protection ◽  
Entropy Generation Rate ◽  
Two Dimensional ◽  
Entropy Analysis ◽  
Local Entropy ◽  
Entropy Generation Number ◽  
Layer Number ◽  
Number Of Layers ◽  
Local Entropy Generation

In this study, entropy analysis was introduced to characterize the thermodynamic properties of a two-dimensional (2D) thermal cloak consisting of multiple layers. The local entropy generation rate distribution was obtained, and the total entropy generation of different models was calculated. The irreversible extent of the heat transfer increased in the even layers with larger thermal conductivities. A better thermal cloak not only enhances thermal protection but also concentrates the energy fluctuations on the plate. The augmentation entropy generation number is used to identify the best cloaking scheme by varying the cloaking layer number from 1 to 20. This work shows that the fitting equation derived by analysis of variance (ANOVA) can be used to optimize the number of layers of the cloaking structure.

scholarly journals Evidence and implications for exciton dissociation in lead halide perovskites

2019 ◽  
Vol 205 ◽  
pp. 06018
Author(s):  
Vandana Tiwari ◽  
Hong-Guang Duan ◽  
Ajay Jha ◽  
Pabitra K. Nayak ◽  
Michael Thorwart ◽  
...  
Keyword(s):  
Thin Films ◽  
Temporal Resolution ◽  
Electronic Spectroscopy ◽  
Two Dimensional ◽  
Transient Grating ◽  
Exciton Dissociation ◽  
Weakly Coupled ◽  
Halide Perovskites ◽  
Lead Halide

We have employed ultrafast transient-grating and two- dimensional electronic spectroscopy to probe dynamics of photo-excited CH3NH3PbI3 thin films with 16-fs temporal resolution. We distinctly capture the 30-fs decay of excitons, weakly coupled to the phonons.

Defect trapping states and charge carrier recombination in organic–inorganic halide perovskites

2016 ◽  
Vol 4 (4) ◽  
pp. 793-800 ◽  
Author(s):  
Xiaoming Wen ◽  
Yu Feng ◽  
Shujuan Huang ◽  
Fuzhi Huang ◽  
Yi-Bing Cheng ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Relaxation Rate ◽  
Defect Density ◽  
Linear Increase ◽  
Carrier Recombination ◽  
Halide Perovskites ◽  
Charge Carrier Recombination ◽  
Pl Intensity ◽  
Recombination Dynamics

The defect density and relaxation rate in organic–inorganic perovskites dominate the carrier recombination dynamics and thus PL intensity exhibits super-linear increase with increasing excitation.

scholarly journals Nanometer-Thick [(FPEA)2PbX4; X=I, Br] 2D Halide Perovskite Based Thin Films for Pollutant Detection and Nonconventional Photocatalytic Degradation

2021 ◽  
Author(s):  
Arindam Mondal ◽  
Akash Lata ◽  
Aarya Prabhakaran ◽  
Satyajit Gupta
Keyword(s):  
Thin Films ◽  
Photocatalytic Degradation ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Reduced Dimensionality ◽  
P Application ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Pollutant Detection

Application of three-dimensional (3D)-halide perovskites (HaP) in photocatalysis encourages the new exercise with two-dimensional (2D) HaP based thin-films for photocatalytic degradation of dye. The reduced dimensionality to 2D-HaPs, with a...

Two-Dimensional Metal Halide Perovskites: Theory, Synthesis, and Optoelectronics

Small Methods ◽  
2017 ◽  
Vol 1 (3) ◽  
pp. 1600018 ◽  
Author(s):  
Chengxue Huo ◽  
Bo Cai ◽  
Zhao Yuan ◽  
Biwu Ma ◽  
Haibo Zeng
Keyword(s):  
Metal Halide ◽  
Two Dimensional ◽  
Halide Perovskites

scholarly journals Anisotropic 2D excitons unveiled in organic–inorganic quantum wells

2021 ◽  
Author(s):  
Lorenzo Maserati ◽  
Sivan Refaely-Abramson ◽  
Christoph Kastl ◽  
Christopher T. Chen ◽  
Nicholas J. Borys ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Crystalline Polymer ◽  
Binding Energies ◽  
Two Dimensional ◽  
Metal Chalcogenide

Hybrid layered metal chalcogenide crystalline polymer hosts strongly anisotropic two-dimensional excitons with large binding energies.

scholarly journals Enhanced screening and spectral diversity in many-body elastic scattering of excitons in two-dimensional hybrid metal-halide perovskites

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Félix Thouin ◽  
Daniele Cortecchia ◽  
Annamaria Petrozza ◽  
Ajay Ram Srimath Kandada ◽  
Carlos Silva
Keyword(s):  
Elastic Scattering ◽  
Metal Halide ◽  
Two Dimensional ◽  
Many Body ◽  
Halide Perovskites
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