ZnCdSe-ZnSe heterostructures grown by MOVPE: influence of the cadmium precursor

Graded index separate confinement heterostructures (GRIN-SCH) for microgun blue-green laser were grown by MOVPE. A first study was carried out using selenium hydride, dimethyl cadmium and two dimethylzine adducts as Se, Cd and Zn precursor respectively. This combination leads to intense prereactions and poor layer morphology. To limit this problem we have then used the tetrahydrothiophene:dimethylcadmium adduct. We have first investigated the quality of thick ZnCdSe layers grown using this adduct. GRIN-SCH structures grown using the two cadmium metalorganics were studied using photoluminescence and optical pumping experiments. Stimulated emission was observed for the two kind of samples.