Single image spectral electroluminescence (photon emission) of GaN HEMTs

Continuous spectra of GaN HEMT photon emission were detected with prism-based optical path. Full spectra are obtained with single emission images by expansion of the emission spot to a spectral tail. Therefore, multi-finger HEMTs require FIB inactivation of excess fingers to ensure single finger operation. The extracted parameter is electron temperature correlated to kinetic energy of the 2DEG electrons. It is field-related and scales with gate voltage, in agreement with device simulation. No spectral peaks were detected.