超宽禁带半导体氧化镓和氮化铝特性研究Research on the Characteristics of Ultra-wide Bandgap Semiconductor GaO and AlN张道华深圳平湖实验室第四代半导体首席科学家、新加坡工程院院士ZHANG DaohuaChief Scientist of Fourth-generation Semiconductors of Shenzhen Pinghu Laboratory, Academician the Academy of Engineering, Singapore