This paper reviews the electronic transport properties of compositionally graded materials. Band gap grading is a powerful tool for engineering the energy band diagram of a device and thus modifying its electrical transport properties (band gap engineering) (1). The most interesting property, which has far reaching consequences for devices made of these materials, is that electrons and holes experience different electric forces so the transport properties of the two types of carriers can be independently tuned.
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Federico Capasso (1986) studied this question.