To develop porous Si as substrate for better quality GaN layer
In this work, we prepare porous Si substrates via anodic etching process. The etching parameters such as time and current would be optimized for the best porous substrate, which is defined by having high porous density. The estimated average of porous density of the substrate is determined through the observation via scanning electron microscopy (SEM). After that, a thin GaN film is deposited onto the best porous Si substrate, using RF-sputtering machine. The grown layer is then will be characterized by photoluminescence (PL), X-ray diffraction (XRD) and Hall-effect measurements. As a comparison, we also grow and characterize a thin GaN on non-porous Si substrate, with the adoption of AlN buffer layer.
High quality GaN layers on Si(111) substrates: AlN buffer layer optimisation and insertion of a SiN intermediate layer
We present a study on the material properties of GaN films grown on (111) silicon substrates by low-pressure metalorganic chemical vapour deposition using AlN buffer layers. This buffer layer is optimised with respect to growth temperature and time for the optical and structural properties of the GaN epilayers. The insertion of a Si x N y intermediate layer significantly increases the optical and structural properties. It results in a reduction of the D 0 X FWHM to 10 meV and in a 2.5-fold increase of its luminescence intensity. The FWHM of symmetric and asymmetric ω-scans are reduced from 832 to 669 arcsec and from 702 to 547 arcsec, respectively.
Industrial Relations in 1988
Undoubtedly, the election of the Hawke Labor Government in 1983 marked a turning point in Australian industrial relations. To a large extent industrial turbulence receded, helped along by global econ omic instability and the influence ofthe Prices and Incomes Accord between the Australian Labor Party and the Australian Council of Trade Union (ACTU). Arguably, the apparent success of the Accord owed something to a widespread concern within unions that the election of a Liberal-National Party government at the federal level would have resulted in a major pro gram of economic regulation, especially in relation to the institutions ofthe labour market. During 1988, despite an increasingly buoyant economy, the continuing influence of these economic and political conditions ensured that the level of industrial disputation remained subdued by historical stan dards, though those opposed to the nascent corporate state or centralised wage fixing may have been heartened by signs that wage restraint was fraying at the...