Energy band gap of the alloy Zn1-xMgxSeyTe1-y lattice matched to ZnTe, InAs and InP

The correlated function expansion (CFE) methodology has been used to estima te the energy band gay and the alloy bond length of Zn1-xMgxSeyTe1-y over t he entire composition space (x, y). The lattice matching condition was obta ined by optimizing the alloy bond length to the bond length of the substrat es (ZnTe, InAs and InP), and the corresponding band gap and its bowing effe ct were identified. Excellent agreement was obtained between the CFE-estima ted band gap and the recent photoluminescence data for the alloy grows on Z nTe and GaAs. As the CFE only requires ternary input data, it can accelerat e efforts to find desirable quaternary alloy compositions. (C) 2000 Elsevie r Science B.V. All rights reserved.