Вышедшие номера
Optical spectra of wide band gap BexZn1-xSe alloys
Mintairov A.M.1,2, Peiris F.C.3, Lee S.3, Bindley U.3, Furdyna J.K.3, Raymond S.1, Merz J.L.1, Melehin V.G.2, Sadchikov K.2
1Department of Electrical Engineering, University of Notre Dame , Notre Dame, IN, USA
2A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
3Department of Physics, University of Notre Dame, Notre Dame, IN, USA
Поступила в редакцию: 1 марта 1999 г.
Выставление онлайн: 20 августа 1999 г.

We report optical measurements (photoluminescence, Raman scattering, and infrared reflectance) of direct band gap and of optical phonon energies of BexZn1-xSe alloys grown by MBE on (001) GaAs substrates for a wide range of Be concentrations. The high band gap of BeSe (5.15 eV) suggests the possibility of using isoternary alloys for ultra-violet optoelectronic applications. And BexZn1-xSe has the inuque advantage that it can be lattice matched to Si at about x=0.5. We observed a strong linear shift of the BexZn1-xSe direct band gap to higher energies with increasing Be content (up to 3.63 eV for x=0.34). Furthermore, optical phonon parameters for the entire range of BeSe content have been obtained. Finally, polarized infra-red and Raman spectra revealed local atomic ordering (anti-clustering) effects in the group-II sublattice.