研究目的
Investigating the suppression of nonradiative recombination in AlxGa1?xN-based quantum wells fabricated on AlN with macrosteps for highly efficient ultraviolet emitters.
研究成果
AlxGa1?xN-based QWs fabricated on AlN macrosteps show a higher emission efficiency and longer PL lifetimes compared to planar QWs, indicating the suppression of nonradiative recombination. This makes MS-QWs promising for highly efficient UV emitters. Future studies could explore the angle dependence of the optical properties.
研究不足
The study focuses on a vicinal angle of 3°, and the angle dependence of the optical properties is suggested as a subject for future studies. The exact mechanism for the suppression of nonradiative recombination in the MS-QW remains debatable.
1：Experimental Design and Method Selection:
The study involves fabricating AlxGa1?xN-based quantum wells on AlN with macrosteps using vicinal sapphire and AlN (0001) substrates. The optical properties were investigated through photoluminescence (PL) spectroscopy and time-resolved photoluminescence (TRPL) spectroscopy.
2：Sample Selection and Data Sources:
Samples were grown by metalorganic vapor phase epitaxy (MOVPE) on sapphire or AlN (0001) vicinal substrates. The substrates were tilted 3° along specific directions to form macrosteps.
3：List of Experimental Equipment and Materials:
Equipment includes a Ti:sapphire laser for excitation, a CCD camera for PL detection, and a streak camera for TRPL measurements. Materials include trimethylgallium, trimethylaluminum, and ammonia as source precursors.
4：Experimental Procedures and Operational Workflow:
The growth process involved initially growing ≈600 nm thick AlN layers at 1200 °C, followed by AlGaN single QWs and AlN cap layers at 1140 °C. The optical properties were then analyzed under various conditions.
5：Data Analysis Methods:
The PL spectra were decomposed into Gaussian curves corresponding to emissions from QWs on terraces and macrosteps. The temperature dependence of the integrated PL intensity and the PL decay curves were analyzed to understand the recombination processes.
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