Vertical scaling of multi-stack Planar Gunn diodes

Planar Gunn diodes have been scaled vertically through combining multiple active epilayer stacks present in previously successful GaAs/AlGaAs devices. Comparison of results from fabricated devices with those simulated using a Monte Carlo approach suggest that while current and power output rises in such scaled designs, this is limited by significant heating which results in sub-linear scaling with the number of stacks. The presence of additional current-limiting mechanisms, such as inactive stacks, are implied if considering the higher currents produced by un-scaled designs or scaled devices at below peak temperatures.