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ocr_text: High Electron Mobility Transistor\n» The HEMT high carrier mobility and switching speed come from his specific design:\n» The wide band element (barrier) is typically doped with donor atoms and has excess\nelectrons in its conduction band.\nThe e- diffuse to the adjacent narrow band material CB Barrier\ndue to the availability of states with lower energy. ri Spt rr\nThe movement of electrons will cause a change in potential an lectric -\nfield between the materials. re SR\nThe electric field will push electrons back to the wide band elem B. The diffu\nprocess continues until electron diffusion and electron drift balan ach other, créatfrg ge, ser es\njunction at equilibrium similar to a p-n junction. Ey\nThe undoped narrow band gap material now has excess maj@rity charge carriers -\n-> 2DEG\nThe fact that the charge carriers are majority carriers yields Supriya, Sweety. (2012).\nhigh switching speeds, and the fact that the low band gap  saistic Mobility Degradation Effect\nsemiconductor is undoped means that there are no donor in 25 nm Single Gate HEMT.\natoms to cause scattering and thus yields high mobility. ie re
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