Patent ID: 8231728
Filing Date: 2012-07-31
Classification: C30B,H01L

Abstract:
1. An epitaxial growth method to form a semiconductor thin film including a heterojunction of a group III-V compound semiconductor by means of molecular beam epitaxy, the method comprising: a first step of irradiating a molecular beam of at least one of group III elements and a molecular beam of a first group V element to form a first compound semiconductor layer; a second step of stopping the irradiation of the molecular beam of the group III element and the molecular beam of the first group V element, starting an irradiation of a molecular beam of a second group V element at the same time, and halting growth for a period of time until a remaining molecular beam intensity of the first group V element is reduced to be in the range of 0.01 to 0.1 of that in the first step; and a third step of restarting an irradiation of a molecular beam of at least one of the group III elements to form an etch stopper layer on the first compound semiconductor layer, the etch stopper layer being composed of the second compound semiconductor layer which is different from the first compound semiconductor, wherein the semiconductor thin film comprises a high electron mobility transistor structure.