Aluminium Gallium Arsenide Research Paper

Aluminium gallium arsenide

Aluminium gallium arsenide (also aluminum gallium arsenide) (AlxGa1-xAs) is a semiconductor material which has almost the same crystal lattice that of GaAs, However the bandgap of AlGaAs is larger. The x in the formula above is a number between 0 and 1 . This corresponds to some arbitrary alloy between GaAs and AlAs.

We take the general formula to be AlGaAs,rather than any particular ratio.The alloy system GaAs/AlGaAs is potentially very important for many high-speed electronics and optoelectronic devices, because the lattice parameter difference between GaAs and AlGaAs is very small, which promises an insignificant concentration of unwanted interface states. Due to this

It is the third most abundant element in the universe after oxygen and silicon. It is approximately present ( 7.5% to 8.3% ) on the earth crust. It also occurs in sea water but its concentration is very low about ( 0.01 mg ).

In 1827 AD , F Wholer , heated the Anhydrous Aluminium Cholride , AlCl3 , with Potassium metal and obtain a grey metallic powder and that was aluminium. Commercially it is formed by the process of electrolysis of fused mixture of Bauxite, Al203.2H2O, and Cryolite , AlF3.3HF

Aluminuim is metallic element and it belongs to Group III-B of the periodic table.

Atomic number : 13 Atomic mass : 26.97 Melting point : 660 degC Boiling point : 2467 degC Density :

So he named the hypothetical element EKA ALUMINIUM.

Later on Gallium was discovered by French chemist Paul E Lecoq de Boisbaudran through an optical instrument used for spectrographic analysis in 1875. He was s doing work on spectra of chemical elements. Spectra are the lines that produced by heating a chemical element. Each chemical element has its own spectra and we can determine the chemical from its spectrum lines. Paul knew about the prediction of Medeleev and at that time a chemical element was missing between the aluminum and indium then he started to learn more about spectrum.He start working to find the gallium element and he thought that element number 31 would present in zinc ore because atomic number of zinc is 30.Finally Pual extracted gallium from zinc ore from the Pyrenees and obtain a small amount of gallium which is (“0.65 grams “) from 430 kg of zinc ore

Gallium is also an plentiful element on earth .Its presence is estimated about 5 parts per million .Mostly it is found in zinc and aluminium ores. The largest producers are australlia,Russia,France and