Abstract
Undoped Ga0.5In0.5P has been successfully grown by organometallic vapor-phase epitaxy on GaAs substrates with a free-electron concentration of 1016 cm−3 and a mobility of 1050 cm2/V s in nominally undoped material. The distribution coefficient of indium in the growth of Ga0.5In0.5P is nearly to unity. Both n- and p-type carrier concentrations of up to 1019 cm−3 have been obtained in the present study. Diethyltelluride and silane are used as n-type dopants. Dimethylzinc is used as the p-type dopant. Te is a very efficient dopant with a distribution coefficient kTe=54. The photoluminescence (PL) intensity increases with Te doping level to a maximum at n=2×1018 cm−3. The silicon distribution coefficient is temperature dependent, due to the incomplete pyrolysis of silane at the growth temperature. Si-doped Ga0.5In0.5P has a lower PL efficiency than Te-doped samples and is not strongly correlated with carrier concentration. The incorporation efficiency of Zn is low, with kZn =3.8×10−3, due to the high vapor pressure of Zn at the growth temperature. The PL intensity of Zn-doped Ga0.5In0.5P also increases with Zn doping level to a maximum at p=2×1018 cm−3 and is comparable to the optimum Te-doped n-type Ga0.5In0.5P. Only a single band-edge PL peak is observed in all cases.
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