Optical and Electrical Properties of AlGaN-Based High Electron Mobility Transistors and Photodetectors with AlGaN/AlN/GaN Channel-Stacking Structure oleh Chia-Feng Lin, Kun-Pin Huang, Han-Wei Wang, Kuei-Ting Chen, Cheng-Jie Wang, Yu-Cheng Kao, Hsiang Chen, Yung-Sen Lin