Arsenic stabilization of InP substrates for growth of GaxIn1−xAs layers by molecular beam epitaxy

Abstract
A new method of cleaning InP substrates under molecular beam epitaxy conditions involving heating to ⩾500 °C in an As4 flux (JAs4 ≃1015–1016 cm−2 s−1) is described. Evidence of surface cleanliness, good morphology, ordered surface reconstruction, and integrity of chemical composition at the interface is given. Lattice‐matched layers of Ga0.47In0.53As grown on InP substrates cleaned in this way showed excellent electrical properties: e.g. a room‐temperature mobility μ300=8600 cmPu2 V−1 s−1 at n300 =1016 cm−3.