HYDROGEN IN CRYSTAILINE SILICON AND GALLIUM ARSENIC

When I was a student in the department of physics, Peking University from 1952 to 1961, Prof.Kun Huang was one of the most respectivable teachers and scientists there. He has taught my classmates and me general physics, solid state physics and semiconductor physics one after another. All his lectures were so splendid as to give us very deep impression. When I became a graduated student, he was my supervisor. He has guided me to enter the gate of science and has been solicitous for my every step in the way. I wrote this review paper to offer my best congratulations to his seventieth birthday and wish him happiness and longevity.