[PS-6-6] Electrolyte Electro-Reflectance Spectra of Crack-Free AlGaN/GaN High Electron Mobility Transistors on Si Substrate ○T. S. Ko1, B. Y. Hu1, N. W. Chang1, D. Y. Lin1, J. S. Li2 (1.National Univ. of Changhua Edu., 2.Feng Chia Univ.(Taiwan))