Optical properties of GaAs/AlAs superlattices with a basis

✍ Scribed by A. Kristensen; P.E. Lindelof; H. Smith; C.B. Sørensen; P. Tidemand-Petersson; E. Veje

• Book ID: 103918988
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 340 KB
• Volume: 12
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1016/0749-6036(92)90268-a

✦ Synopsis

We have studied optical properties of three GaAs/AlAs superlattices by applying photoluminescence and photnluminescence excitation spectroscopy. The first superlattice is a simple Kronig-Penney potential with a period of 16 monolayers. The superlattice period is doubled in the second structure, and each cell contains two potential wells; a 2-point basis. In the third structure, the superlattice period is tripled, having a 3-point basis. The superlattice period and total thickness have been measured by high-resolution X-ray diffraction. The X-ray spectra clearly reveal the l-, 2-, and 3-point bases. In the photoluminescence excitation spectra we observe and identify the higher complexities of the 2-and 3-point basis superlattices caused by introducing energy gaps in the lowestlying conduction band.