Engineering Commons^™

Infrared Optical Absorbance Of Intersubband Transitions In Gan/Algan Multiple Quantum Well Structures, Qiaoying Zhou, Jiayu Chen, B. Pattada, M. O. Manasreh, Faxian Xiu, Steve Putigan, K. S. Ramaiah, Hadis Morkoç

Electrical and Computer Engineering Publications

Intersubband transitions in Si-doped molecular beam epitaxygrown GaN/AlGaN multiple quantum wells on c-plane sapphire were investigated using the Fourier-transform infrared optical absorption technique. Several GaN quantum well samples were grown with either AlGaN bulk or GaN/AlGaN short period superlattice barriers. The measurements were made in a waveguide configuration utilizing a facet polished at 45° to the c plane. The integrated area of the intersubband transitions in several waveguides cut from different location of the wafer was measured, from which we estimated the two-dimensional electron gas density (σ). The measured values of σ are about two orders of magnitude larger …