TY - JOUR
T1 - Characterization of highly doped Ga0.86 In0.14As0.13Sb0.87 grown by liquid phase epitaxy
AU - Díaz-Reyes, J.
AU - Galván-Arellano, M.
AU - Mendoza-Alvarez, J. G.
AU - Arias-Cerón, J. S.
AU - Herrera-Pérez, J. L.
AU - López-Cruz, E.
PY - 2017
Y1 - 2017
N2 - Ga0.86In0.14As0.13Sb0.87 layers lattice-matched to (100) Te-GaSb have been grown using the liquid phase epitaxy technique under supercooling conditions. N and p type layers were grown by adding tellurium or zinc in a wide range of molar fraction in the growth solution. By Raman spectroscopy, the structural quality of the epilayers was characterized. The Raman spectra show that the layers become more defective as the dopant molar fraction is increased, n- or p-type. Two main bands are observed in the Raman spectra centered at 230 and 245 cm-1 that depend strongly on the incorporated dopant molar concentration (Te or Zn), which are assigned to the observed vibrational modes of GaAs-like and (GaSb+InAs)-like mixture. The low-temperature photoluminescence of n (or p)-type GaInAsSb was measured as function of dopant concentration added to the melt solution. The photoluminescence spectra were interpreted taking into account the nonparabolicity of the conduction (or valence) band. Both the band filled as well as band tailing effects due to Coulomb interaction of free carriers with ionized impurities and shrinkage due to exchange interaction between free carriers were considered in order to properly be taken into account for the observed features of the photoluminescence spectra. It is shown that the band-to-band transition energy can be used to estimate the free carrier concentration in GaInAsSb for a wide range of dopant concentration.
AB - Ga0.86In0.14As0.13Sb0.87 layers lattice-matched to (100) Te-GaSb have been grown using the liquid phase epitaxy technique under supercooling conditions. N and p type layers were grown by adding tellurium or zinc in a wide range of molar fraction in the growth solution. By Raman spectroscopy, the structural quality of the epilayers was characterized. The Raman spectra show that the layers become more defective as the dopant molar fraction is increased, n- or p-type. Two main bands are observed in the Raman spectra centered at 230 and 245 cm-1 that depend strongly on the incorporated dopant molar concentration (Te or Zn), which are assigned to the observed vibrational modes of GaAs-like and (GaSb+InAs)-like mixture. The low-temperature photoluminescence of n (or p)-type GaInAsSb was measured as function of dopant concentration added to the melt solution. The photoluminescence spectra were interpreted taking into account the nonparabolicity of the conduction (or valence) band. Both the band filled as well as band tailing effects due to Coulomb interaction of free carriers with ionized impurities and shrinkage due to exchange interaction between free carriers were considered in order to properly be taken into account for the observed features of the photoluminescence spectra. It is shown that the band-to-band transition energy can be used to estimate the free carrier concentration in GaInAsSb for a wide range of dopant concentration.
KW - GaInAsSb semiconductors
KW - Liquid phase epitaxy growth
KW - Photoluminescence spectroscopy
KW - Raman
UR - http://www.scopus.com/inward/record.url?scp=85009433511&partnerID=8YFLogxK
M3 - Artículo
AN - SCOPUS:85009433511
SN - 0035-001X
VL - 63
SP - 55
EP - 64
JO - Revista Mexicana de Fisica
JF - Revista Mexicana de Fisica
IS - 1
ER -