基于多波长激光的瞬态热反射法监测GaN HEMT沟道温度

Simultaneous high-spatial and high-temporal resolution channel-temperature characterization methods are in great demand but still lacking for GaN devices. In this work, we developed a multiwavelength laser-based transient thermoreflectance technique (MWL-TTR) by using a 320-nm continuous wave (CW) laser to monitor the channel temperature and a 532-nm CW laser to monitor the metal contacts, achievi...