Quantum-size effect and intersubband transitions in zinc blend Al_xGa_(1-x)N quantum cubes embedded in AlN matrix

摘要

In this work, we study the quantum-size effect and intersubband (ISB) transitions in Zinc Blende (ZB) quantum structures by using a series expansion model to calculate the band structures of Al_xGa_(1-x)N quantum cubes. Without the quantum confined Stark (QCSE) effect, the quantum size effect and size-tunable emission properties of ZB Al_xGa_(1-x)N quantum cubes can be really explored. Simulations results show the important factors of the composition, cluster size, quantum confined potential, effective mass, and strain in determiningrnthe optical properties of ZB Al_xGa_(1-x)N quantum cubes. For those quantum cubes with larger sizes and composition contrasts, ISB transitions in the conduction band are suitable to develop devices operating in the telecommunication windows. In addition, Al_xGa_(1-x)N quantum cubes can take their advantages of size-tunable emission properties, ISB transitions, and ISB absorptions in devices such as LEDs, Lasers, telecommunication devices, and photo detectors.