TY - JOUR
T1 - Band gap of strain-symmetrized, short-period Si/Ge superlattices
AU - Olajos, Janos
AU - Engvall, Jesper
AU - Grimmeiss, Hermann G.
AU - Menczigar, Ulrich
AU - Abstreiter, Gerhard
AU - Kibbel, Horst
AU - Kasper, Erich
AU - Presting, Hartmut
PY - 1992
Y1 - 1992
N2 - We report an identification and determination of the band-gap energies in a series of strain-symmetrized Sin/Gen superlattices. Absorption onsets are observed that shift toward higher energies with decreasing period length in superlattices with identical Si/Ge ratio. Band-gap energies of 0.67, 0.76, and 0.88 eV for Si6/Ge6, Si5/Ge5, and Si4/Ge4 superlattices, respectively, are determined by a fitting procedure. Strong photoluminescence and electroluminescence are observed for the Si5/Ge5 superlattices. The energetic position indicates that the luminescence is related to interband transitions.
AB - We report an identification and determination of the band-gap energies in a series of strain-symmetrized Sin/Gen superlattices. Absorption onsets are observed that shift toward higher energies with decreasing period length in superlattices with identical Si/Ge ratio. Band-gap energies of 0.67, 0.76, and 0.88 eV for Si6/Ge6, Si5/Ge5, and Si4/Ge4 superlattices, respectively, are determined by a fitting procedure. Strong photoluminescence and electroluminescence are observed for the Si5/Ge5 superlattices. The energetic position indicates that the luminescence is related to interband transitions.
UR - http://www.scopus.com/inward/record.url?scp=0347718974&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.46.12857
DO - 10.1103/PhysRevB.46.12857
M3 - Article
AN - SCOPUS:0347718974
SN - 0163-1829
VL - 46
SP - 12857
EP - 12860
JO - Physical Review B
JF - Physical Review B
IS - 19
ER -