Patent ID: 8586993

Claim:
A tunnel transistor, comprising: a first compound semiconductor; a second compound semiconductor on the first compound semiconductor; a third compound semiconductor on the second compound semiconductor; a first doped region extending through the second compound semiconductor into the first compound semiconductor; a second doped region spaced apart from the first doped region and extending through the third compound semiconductor into the second compound semiconductor, the second doped region having an opposite doping type as the first doped region; a first two-dimensional charge carrier gas arises due to polarization charges and extends in the first compound semiconductor from the first doped region toward the second doped region and ending prior to reaching the second doped region; a second two-dimensional charge carrier gas arises due to polarization charges and extends in the second compound semiconductor from the second doped region toward the first doped region and ending prior to reaching the first doped region; and a gate over the first and second two-dimensional charge carrier gases.