氮化物的范德华外延：基底结构、多性能控制和紫外光电器件应用Van der Waals Epitaxy of Nitrides: Substrate Construction, Multi-Properties Control and Ultraviolet Optoelectronic Device Application孙晓娟中科院长春光机所研究员SUN XiaojuanProfessor of Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences