Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites

2021 ◽  
Vol 33 (11) ◽  
pp. 2006233
Author(s):  
Jianhui Fu ◽  
Mingjie Li ◽  
Ankur Solanki ◽  
Qiang Xu ◽  
Yulia Lekina ◽  
...  
Keyword(s):  
Electronic States ◽  
Optical Phonons ◽  
Halide Perovskites

scholarly journals Long-lived polarization memory in the electronic states of lead-halide perovskites from local structural dynamics

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Jasmine P. H. Rivett ◽  
Liang Z. Tan ◽  
Michael B. Price ◽  
Sean A. Bourelle ◽  
Nathaniel J. L. K. Davis ◽  
...  
Keyword(s):  
Structural Dynamics ◽  
Electronic States ◽  
Halide Perovskites ◽  
Lead Halide

Optical characterizations of the surface states in hybrid lead–halide perovskites

2016 ◽  
Vol 18 (18) ◽  
pp. 12626-12632 ◽  
Author(s):  
Weiguang Kong ◽  
Tao Ding ◽  
Gang Bi ◽  
Huizhen Wu
Keyword(s):  
Electronic States ◽  
Surface States ◽  
Deep Trap ◽  
Dangling Bonds ◽  
Carrier Lifetimes ◽  
Halide Perovskites ◽  
And Diffusion ◽  
Lead Halide

It is demonstrated that the optical dynamics in MAPbI3 is primarily determined by the surface states. Pb dangling bonds in MAPbI3 introduce shallow electronic states, whereas rich-iodine surface of MAPbI3 induces deep trap centers for carriers which are detrimental to carrier lifetimes and diffusion lengths.

Photoreflectance and Resonant Raman Scattering in Short Period Si/Ge Superlattices on Ge (001) and Si (001)

1991 ◽  
Vol 220 ◽  
Author(s):  
U. Menczigar ◽  
K. Eberl ◽  
G. Abstreiter
Keyword(s):  
Optical Properties ◽  
Molecular Beam Epitaxy ◽  
Raman Scattering ◽  
Molecular Beam ◽  
Electronic States ◽  
Optical Phonons ◽  
Short Period ◽  
Resonant Raman ◽  
Resonant Raman Scattering ◽  
Etalon Effect

ABSTRACTShort period Si/Ge superlattices have been grown on Ge (001) and Si (001) substrates by molecular beam epitaxy. The optical properties of the superlattices have been studied with photoreflectance. (PR) and resonant Raman scattering (RRS). With PR we are able to observe new, structural induced transitions for all superlattices which are related to E0-and E1-like gaps. The analysis of PR spectra is complicated by an optical etalon effect if the samples are sufficently thick. The E1-like transitions in the range between 1.9eV and 2.7eV are also studied with RRS. Due to the confinement of the optical phonons in the Ge and Si layers RRS is able to probe the bandstructure in each layer seperately. Localized electronic states in the Ge layers can be observed with RRS for a Si4Ge18 superlattice and are compared with PR measurements.

scholarly journals Kinetic modelling of intraband carrier relaxation in bulk and nanocrystalline lead-halide perovskites

2020 ◽  
Vol 22 (31) ◽  
pp. 17605-17611
Author(s):  
Thomas R. Hopper ◽  
Ahhyun Jeong ◽  
Andrei A. Gorodetsky ◽  
Franziska Krieg ◽  
Maryna I. Bodnarchuk ◽  
...  
Keyword(s):  
Kinetic Modelling ◽  
Relaxation Model ◽  
Optical Phonons ◽  
Hot Carriers ◽  
Carrier Relaxation ◽  
Perovskite Materials ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Lead Halide

Our carrier relaxation model accounts for the redistribution of energy from hot carriers to both optical phonons and cold carriers in lead-halide perovskite materials.

scholarly journals Optical phonons in methylammonium lead halide perovskites and implications for charge transport

2016 ◽  
Vol 3 (6) ◽  
pp. 613-620 ◽  
Author(s):  
Michael Sendner ◽  
Pabitra K. Nayak ◽  
David A. Egger ◽  
Sebastian Beck ◽  
Christian Müller ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Charge Transport ◽  
Optical Phonon ◽  
Optical Phonons ◽  
Phonon Coupling ◽  
Upper Limits ◽  
Electron Phonon Coupling ◽  
Halide Perovskites ◽  
Lead Halide

The measured optical phonon frequencies are used to determine the electron–phonon coupling and upper limits for charge carrier mobilities.

Inelastic scattering at surfaces and interfaces

1986 ◽  
Vol 44 ◽  
pp. 392-393
Author(s):  
R. H. Ritchie ◽  
A. Howie
Keyword(s):  
Inelastic Scattering ◽  
Surface Properties ◽  
Correlation Energy ◽  
Condensed Matter ◽  
Charged Particles ◽  
Condensed Matter Physics ◽  
Optical Phonons ◽  
Exchange Correlation ◽  
Surfaces And Interfaces ◽  
Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

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