Infrared Optical Studies of Semiconductors at Large Hydrostatic Pressures

1997 ◽  
Vol 499 ◽  
Author(s):  
E. E. Haller ◽  
M. D. McCluskey
Keyword(s):  
Hydrostatic Pressure ◽  
Vibrational Mode ◽  
Far Infrared ◽  
Infrared Region ◽  
Host Lattice ◽  
Uniaxial Pressure ◽  
Electromagnetic Spectrum ◽  
Local Vibrational Mode ◽  
Specific Complex ◽  
Pressure Medium

ABSTRACTAmong the various external disturbances used in the study of semiconductors, including electric and magnetic fields as well as uniaxial pressure, large hydrostatic pressures can be employed to induce dramatic changes in host lattice, dopant and defect properties. Diamond anvil cells with an appropriate pressure medium (e.g. liquid N2 or alcohol mixtures) allow the application of pressures up to hundreds of kbar. In this pressure range the global conduction band minimum of a semiconductor can become a local minimum. GaAs for example changes near 45 kbar from a direct (Γ-band) to an indirect (X-band) semiconductor. Donors in GaAs and InP transform from their shallow, hydrogenic state to the DX configuration at hydrostatic pressures near 23 and 82 kbar, respectively. This donor configuration change has been studied using local vibrational mode (LVM) spectroscopy in the far infrared region of the electromagnetic spectrum. Recently we have investigated several LVM's of H-containing complexes in GaAs as a function of hydrostatic pressure at liquid He temperatures. Depending on the specific complex we find the LVM frequencies to vary either linearly, sub- or superlinearly with hydrostatic pressure. In the case of O in Si the vibrational mode changes its character from that of a harmonic oscillator to a rotor as pressure is applied. The implications of the pressure dependences of LVM's are discussed.

Hydrogen Local Vibrational Modes in Compound Semiconductors

1998 ◽  
Vol 513 ◽  
Author(s):  
M. D. Mccluskey
Keyword(s):  
Hydrostatic Pressure ◽  
Resonant Interaction ◽  
Host Lattice ◽  
Local Mode ◽  
Vibrational Modes ◽  
Temperature Dependent ◽  
Local Vibrational Mode ◽  
Combination Modes ◽  
Stretch Mode ◽  
Anharmonic Coupling

ABSTRACTLocal vibrational mode (LVM) spectroscopy of hydrogen and deuterium in GaP, AlSb, ZnSe, and GaN has provided important information about the structures of dopanthydrogen complexes and their interaction with the host lattice. In GaN:Mg, for example, hydrogen binds to a host nitrogen which is adjacent to the magnesium acceptor. In GaP and ZnSe, it has been demonstrated that the temperature dependent shifts of LVM's are proportional to the lattice thermal energy, a consequence of the anharmonic coupling of the local mode to acoustical phonons.Large hydrostatic pressures have been applied to semiconductors to probe the vibrational properties of hydrogen-related complexes. In GaAs, the pressure dependent shifts of the 12C-H and 13C-H stretch modes have positive curvatures, while the shift of the S-H stretch mode has a negative curvature. This may be related to the fact that in the bond-centered C-H complex, the hydrogen is compressed between the carbon acceptor and one gallium host atom, whereas in the S-H complex, the hydrogen occupies an interstitial position and is not crowded by neighboring atoms. If these trends are general, then hydrostatic pressure may be a powerful tool in determining the position of the hydrogen atom(s) in a complex.In AISb. pressure was utilized to resolve a mystery as to why the Se-D complex gives rise to one stretch mode peak while the Se-H stretch mode splits into three peaks. This anomalous splitting is explained in terms of a new resonant interaction between the stretch mode and combination modes involving a wag mode harmonic and extended lattice phonons. The interaction gives rise to vibrational modes with both localized and extended components. When the temperature or hydrostatic pressure is varied, the modes exhibit anti-crossing behavior.

Local-vibrational-mode spectroscopy ofDXcenters in Si-doped GaAs under hydrostatic pressure

1991 ◽  
Vol 66 (6) ◽  
pp. 774-777 ◽  
Author(s):  
J. A. Wolk ◽  
M. B. Kruger ◽  
J. N. Heyman ◽  
W. Walukiewicz ◽  
R. Jeanloz ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Vibrational Mode ◽  
Local Vibrational Mode ◽  
Si Doped ◽  
Mode Spectroscopy

Local Vibrational Mode Spectroscopy of Impurities in Semiconductors

1985 ◽  
Vol 46 ◽  
Author(s):  
R. C. Newman
Keyword(s):  
Gallium Arsenide ◽  
Dipole Moment ◽  
Vibrational Mode ◽  
Diagnostic Techniques ◽  
Heat Treatments ◽  
Host Lattice ◽  
Infrared Band ◽  
Local Vibrational Mode ◽  
Mode Spectroscopy

AbstractInfrared band—mode and LVM absorption is illustrated for a range of impurities and impurity—complexes in silicon and gallium arsenide. We discuss the effects of changes in the local force constants and contributions to the dipole moment resulting from displacements of host lattice atoms. The difficulties in establishing absolute calibrations relating the strength of the absorption to the concentration of defects are highlighted. Our purpose is to show how the measurements lead to characterization of crystals and how they complement other diagnostic techniques to evaluate effects of irradiation, heat treatments, diffusions etc.

Trivacancy-oxygen complex in silicon: Local vibrational mode characterization

2009 ◽  
Vol 404 (23-24) ◽  
pp. 4568-4571
Author(s):  
L.I. Murin ◽  
B.G. Svensson ◽  
J.L. Lindström ◽  
V.P. Markevich ◽  
C.A. Londos
Keyword(s):  
Vibrational Mode ◽  
Local Vibrational Mode ◽  
Oxygen Complex

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

Quantitative assessment of Be acceptors in GaAs by local vibrational mode spectroscopy

1991 ◽  
Vol 69 (2) ◽  
pp. 971-974 ◽  
Author(s):  
J. Wagner ◽  
M. Maier ◽  
R. Murray ◽  
R. C. Newman ◽  
R. B. Beall ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Vibrational Mode ◽  
Local Vibrational Mode ◽  
Mode Spectroscopy

Hagen-Rubens relation beyond far-infrared region

2010 ◽  
Vol 90 (4) ◽  
pp. 44004 ◽  
Author(s):  
F. E. M. Silveira ◽  
S. M. Kurcbart
Keyword(s):  
Far Infrared ◽  
Infrared Region

scholarly journals Graphene-Based Plasmonic Tunable Dual-Band Bandstop Filter in the Far-Infrared Region

2018 ◽  
Vol 10 (6) ◽  
pp. 1-9 ◽  
Author(s):  
Yijun Cai ◽  
Kai Da Xu ◽  
Rongrong Guo ◽  
Jinfeng Zhu ◽  
Qing Huo Liu
Keyword(s):  
Far Infrared ◽  
Infrared Region ◽  
Dual Band ◽  
Bandstop Filter
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