Electrodeposited CuInSe2 Thin Film Junctions
We have investigated thin films and junctions based on copper indium diselenide (CIS) which have been grown by electrochemical deposition. CIS is a leading candidate for use in polycrystalline thin film photovoltaic solar cells. Electrodeposition is a cost-effective method for producing thin-film CIS. We have produced both p and n type CIS thin films from the same aqueous solution by simply varying the deposition potential. A CIS pn junction was deposited using a step-function potential. Stoichiometry of the single layer films was determined by energy dispersive spectroscopy. Carrier densities of these films increased with deviation from stoichiometry, as determined by the capacitance versus voltage dependence of Schottky contacts. Optical bandgaps for the single layer films as determined by transmission spectroscopy were also found to increase with deviation from stoichiometry. Rectifying current versus voltage characteristics were demonstrated for the Schottky barriers and for the pn junction.
Degeneracy effect on the optical properties of CuInSe2
Abstract The absorption spectra of as-grown and copper-annealed n-CuInSe 2 samples were obtained at room temperature. A shift of the bandgap to higher energy is observed for the annealed sample compared with its value in the as-grown sample. This behaviour can be explained by taking into consideration the low value of the effective mass of the electron in CuInSe 2 which results in it becoming degenerate at relatively low concentrations. The absorption edge then shifts with the Fermi-level, which lies in the conduction band for degenerate n-type semiconductors.
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...