Author: Siu Sing ChanPublisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 172
Book Description
As the need for high speed devices and circuits continues to grow, GaAs has received increasing attention as a viable (both technologically and economically) electronic material complementary to Si. The advantages of GaAs lie in its much higher electron mobility and its compatibility with optoelectronic devices. The merits of a planar process have been well demonstrated in Si technology, and in the course of the development of a similar process for GaAs, ion implantation has emerged as an indispensable tool. Ion implantation is inherently a much more precise and controllable method of selective semiconductor doping than diffusion. To attain the degree of line-width control necessary for high speed or high density devices, ion implantation is a prerequisite. Besides, many useful dopants in GaAs cannot be introduced readily by diffusion because of material constraints. In spite of its importance in the fabrication of devices which take advantage of the high electron mobility of GaAs, donor implantation in GaAs has not found as much success as acceptor implantations. In order to avoid amphoteric tendencies and possible self-compensation mechanisms, it is generally best to use a column VI element.