Optical functionality of dense excitonic systems in nitride-based deep-ultraviolet ternary alloy semiconductors

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420289
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Yamaguchi University
• Principal Investigator: Yamada Yoichi 山口大学, 理工学研究科, 教授 (00251033)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 励起子分子 / 励起子 / 局在化 / 低次元化 / 窒化物半導体 / 混晶半導体 / 励起子工学 / 量子井戸

Outline of Final Research Achievements

We have studied the fundamental optical properties of biexcitons in AlGaN-based quantum wells that exhibit fundamental absorption edges in the deep-ultraviolet spectral range. We determined the binding energy of biexcitons by means of photoluminescence excitation spectroscopy. We successfully evaluated the effect of quantum confinement, separate from the effect of localization on the binding energy of biexcitons in the ternary alloy quantum wells. We measured several quantum wells with different well layer thicknesses and with different barrier layer alloy compositions. As a result, we clarified that the maximum biexciton binding energy we have evaluated so far was as large as 160 meV. We also clarified that the biexcitons was stable above room temperature up to 750 K.

Free Research Field

半導体光物性