Photoluminescence and Photoluminescence Excitation Spectra of GaAs Grown Directly on Si

1986 ◽  
Vol 67 ◽  
Author(s):  
S. Zemon ◽  
S. K. Shastry ◽  
P. Norris ◽  
C. Jagannath ◽  
G. Lambert
Keyword(s):  
High Temperature ◽  
Valence Band ◽  
Conduction Band ◽  
Tensile Strain ◽  
Second Line ◽  
Photoluminescence Excitation ◽  
Excitation Spectra ◽  
Biaxial Tensile ◽  
Band Transition ◽  
Biaxial Tensile Strain

ABSTRACTThe photoluminescence of GaAs/Si grown by OMCVD has been analyzed as a function of temperature and the dominant high temperature line identified as a conduction-band-to-valence-band transition. Photoluminescence excitation spectra indicate that the transition is excitonic at 4.2 K. A second line, also identified as intrinsic, dominates the spectra below 100 K. A biaxial tensile strain is proposed to account for the two intrinsic lines through a splitting of the valence band degeneracy.

The effect of biaxial tensile strain on structure and photoelectric properties of Fe-doped GaN monolayer

2021 ◽  
Vol 197 ◽  
pp. 110644
Author(s):  
Juan Song ◽  
Zhao Ding ◽  
Xue-Fei Liu ◽  
Ze-Chen Huang ◽  
Jia-Wei Li ◽  
...  
Keyword(s):  
Tensile Strain ◽  
Photoelectric Properties ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

scholarly journals Влияние ионов неодима (III) на фотолюминесценцию сульфидов кадмия и цинка в полиакрилатной матрице

2022 ◽  
Vol 56 (2) ◽  
pp. 229
Author(s):  
В.П. Смагин ◽  
А.А. Исаева ◽  
Е.А. Шелепова
Keyword(s):  
Methyl Methacrylate ◽  
Valence Band ◽  
Conduction Band ◽  
Structural Defects ◽  
Excitation Spectra ◽  
Nanoscale Particles ◽  
Semiconductor Structures ◽  
Semiconductor Particles ◽  
Optically Transparent

Nanoscale particles ZnS:Nd3+, CdS:Nd3+ and (Zn,Cd)S:Nd3+ were synthesized and doped in a polymerizing methyl methacrylate medium during the production of optically transparent polyacrylate composites of the composition PMMA/ZnS:Nd3+, PMMA/CdS:Nd3+ and PMMA/(Zn,Cd)S:Nd3+. The excitation of photoluminescence (FL) and FL of semiconductor structures in composites is associated with the transition of electrons from the valence band to the conduction band and to the levels of structural defects of semiconductor particles, followed by recombination at these levels. Based on changes in the excitation spectra of FL and FL composites, assumptions are made about the structure of particles, the distribution of Nd3+ ions in it and their effect on photoluminescence.

scholarly journals Moderate strain induced indirect bandgap and conduction electrons in MoS2 single layers

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
János Pető ◽  
Gergely Dobrik ◽  
Gergő Kukucska ◽  
Péter Vancsó ◽  
Antal A. Koós ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Fermi Level ◽  
Conduction Band ◽  
Carrier Density ◽  
Tensile Strain ◽  
Charge Carrier Density ◽  
Conduction Electrons ◽  
Metallic Character ◽  
Optical Bandgaps ◽  
Biaxial Tensile Strain

Abstract MoS2 single layers are valued for their sizeable direct bandgap at the heart of the envisaged electronic and optoelectronic applications. Here we experimentally demonstrate that moderate strain values (~2%) can already trigger an indirect bandgap transition and induce a finite charge carrier density in 2D MoS2 layers. A conclusive proof of the direct-to-indirect bandgap transition is provided by directly comparing the electronic and optical bandgaps of strained MoS2 single layers obtained from tunneling spectroscopy and photoluminescence measurements of MoS2 nanobubbles. Upon 2% biaxial tensile strain, the electronic gap becomes significantly smaller (1.45 ± 0.15 eV) than the optical direct gap (1.73 ± 0.1 eV), clearly evidencing a strain-induced direct to indirect bandgap transition. Moreover, the Fermi level can shift inside the conduction band already in moderately strained (~2%) MoS2 single layers conferring them a metallic character.

scholarly journals Tunable Dirac cones in two-dimensional covalent organic materials: C2N6S3 and its analogs

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 52065-52070 ◽  
Author(s):  
Lin Wei ◽  
Xiaoming Zhang ◽  
Xiaobiao Liu ◽  
Hongcai Zhou ◽  
Bo Yang ◽  
...  
Keyword(s):  
Tensile Strain ◽  
Organic Materials ◽  
Fermi Velocity ◽  
Two Dimensional ◽  
Biaxial Strain ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

C2N6S3 sustains a biaxial tensile strain up to 24% and its Fermi velocity can be tuned by biaxial strain.

scholarly journals Direct and indirect band gaps in Ge under biaxial tensile strain investigated by photoluminescence and photoreflectance studies

2018 ◽  
Vol 97 (19) ◽  
Author(s):  
D. Saladukha ◽  
M. B. Clavel ◽  
F. Murphy-Armando ◽  
G. Greene-Diniz ◽  
M. Grüning ◽  
...  
Keyword(s):  
Tensile Strain ◽  
Band Gaps ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

Biaxial strain effect on the electronic structure and valleytronic properties of a MoS2/CoO(111) heterostructure

2019 ◽  
Vol 21 (27) ◽  
pp. 15151-15156 ◽  
Author(s):  
Guang Yang ◽  
Jia Li ◽  
Ze Liu ◽  
Congcong Li ◽  
Xiujuan Mao
Keyword(s):  
Electronic Structure ◽  
Tensile Strain ◽  
Spin Splitting ◽  
Strain Effect ◽  
Biaxial Strain ◽  
Berry Curvature ◽  
Valley Splitting ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

Spin splitting, valley splitting and Berry curvature at the K and K′ valleys of a MoS2/CoO(111) heterostructure can be tuned continually by biaxial tensile strain.

Effects of biaxial tensile strain on the first-principles-driven thermal conductivity of buckled arsenene and phosphorene

2018 ◽  
Vol 20 (43) ◽  
pp. 27611-27620 ◽  
Author(s):  
Armin Taheri ◽  
Carlos Da Silva ◽  
Cristina H. Amon
Keyword(s):  
Thermal Conductivity ◽  
First Principles ◽  
Tensile Strain ◽  
2D Materials ◽  
Two Dimensional ◽  
First Principles Study ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain ◽  
Phonon Properties

A first-principles study is conducted to investigate the effect of biaxial tensile strain on phonon properties and thermal conductivity of buckled phosphorene and arsenene, novel two-dimensional (2D) materials of group-VA.

scholarly journals Strain-induced enhancement in the thermoelectric performance of a ZrS2monolayer

2016 ◽  
Vol 4 (20) ◽  
pp. 4538-4545 ◽  
Author(s):  
H. Y. Lv ◽  
W. J. Lu ◽  
D. F. Shao ◽  
H. Y. Lu ◽  
Y. P. Sun
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Tensile Strain ◽  
Thermoelectric Performance ◽  
Simultaneous Increase ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

The thermoelectric performance of the ZrS2monolayer is greatly enhanced by the biaxial tensile strain, due to the simultaneous increase of the Seebeck coefficient and decrease of the thermal conductivity.

First principle study of inducing superconductivity in α-graphyne by hole-doping and biaxial tensile strain

2016 ◽  
Vol 124 ◽  
pp. 183-189 ◽  
Author(s):  
Toktam Morshedloo ◽  
Mahmood Rezaee Roknabadi ◽  
Mohammad Behdani ◽  
Mohsen Modarresi ◽  
Ali Kazempour
Keyword(s):  
Tensile Strain ◽  
Hole Doping ◽  
First Principle ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain

Investigation of cubic single crystal HfO2/Si interface under in-plane biaxial tensile strain

2017 ◽  
Vol 196 ◽  
pp. 361-364
Author(s):  
Li-Bin Shi ◽  
Ming-Biao Li ◽  
Xiao-Ming Xiu ◽  
Xu-Yang Liu ◽  
Kai-Cheng Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Tensile Strain ◽  
Biaxial Tensile ◽  
Biaxial Tensile Strain
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