3 HEMT basic

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For basic understanding of the HEMT operation it is needed to know about formation of the 2DEG an it's properties which is a key component of the HEMT functionality. This knowledge together with HEMT operation and types is explained in this chapter in a way that should be understandable for wide public. Some of the physical backgrounds for the HEMT theory cannot be more simplyfied and is thus more challenging to understand especially theory about formation of the 2DEG.