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Single crystal layers have been grown epitaxially from the vapor phase in a novel apparatus, using gaseous arsine and phosphine as sources of arsenic and phosphorus. These layers exhibit the highest quality, and the widest range of controlled resistivity yet reported for solid solutions in this system. Vegard's law is obeyed over the entire composition range. At room temperature, the change from a direct to an indirect transition across the band gap occurs at the value, . Electron mobilities in these layers are high; a sample containing 27% , for instance, had a room temperature mobility of 4900 cm2/v‐sec, and a 69% gallium phosphide alloy had a mobility of 700 cm2/v‐sec at room temperature. Both n‐ and p‐type doping have been obtained, with hydrogen selenide gas and zinc vapor as the sources of donor and acceptor impurities, respectively. In this apparatus it is also easy to prepare multilayered structures incorporating layers of different resistivity and/or composition.
Tietjen et al. (Sat,) studied this question.