LP-MOCVD growth of ternary BxGa1?xAs epilayers on (001)GaAs substrates using TEB, TMGa and AsH3
Zinc-blende BxGa1?xAs alloys have been successfully grown on exactly oriented (001)GaAs substrates using triethylboron, trimethylgallium and arsine sources. The growth has been accomplished in a vertical low-pressure metalorganic chemical vapor deposition (LP-MOCVD) reactor. Boron incorporation behaviors have been extensively studied as a function of growth temperature and gas-phase boron mole fraction. The evolution of surface morphology was also observed. The maximum boron composition of 5.8% is obtained at the optimum growth temperature of 580C. RMS roughness over the surface area of 11?m2 is only 0.17nm at such growth conditions. Based on the experimental results, it has been clearly shown that boron incorporation will decrease significantly at higher temperature (>610C) or at much lower temperature (?550C).
triethylboron metalorganic chemical vapor deposition bgaas gaas