| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| 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.
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