Hydrothermal Growth and Photoluminescence of Znl-xMgxO Alloy Crystals
Abstract
Znl-xMgxO alloy formation via band gap engineering is important in the development of blue-UV optoelectronic devices by providing lattice-matched transparent substrates for ZnO and nitride-related devices. Zn1-Mgx0 alloy single crystals (Zn0.97MgO.030 and Zn0.945MgO.0550) have been successfully grown by the hydrothermal technique. The growth experiments were carried out at 650 c and 15-18 kpsi in alkaline solutions. Zn1-xMgxO alloy crystals were formed at pressures below _22 kpsi at the growth temperature of 650 deg c. These conditions are similar to the formation of MgO under hydrothermal conditions. A thin ZnO layer formed on the surface of the ZnMgO crystals as the autoclaves cooled to room temperature. After the ZnO layer was removed by etching or polishing from both the Zn0.97MgO.030 and Zno 945MgO.0550 samples, blue shifts of the photoluminescence emission from the 3.364 eV line of pure ZnO to 3.414 and 3.447 eV, respectively, were measured at ~ 18 K. The composition of the alloys was confirmed by using secondary ion mass spectroscopy (S IMS) elemental analysis. X-ray diffraction indicated that the alloy crystals have good structural quality, whereas the lattice parameters arc smaller than those of pure ZnO (for Zn0.945Mg0.0550 a) 3.2416 A, c) 5.1998 A) because the radius of Mg2+ is smaller than that of Zn2+.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2006
- Accession Number
- ADA485944
Entities
People
- Buguo Wang
- Lionel Bouthillette
- Michael Callahan
Organizations
- Air Force Research Laboratory