Monolayer-Scale GaN/AlN Multiple Quantum Wells for High Power e-Beam Pumped UV-Emitters in the 240-270 nm Spectral Range
| Autor: | Dmitrii V. Nechaev, Tao Wang, Xinqiang Wang, D. E. Sviridov, Stefan Ivanov, N. A. Gamov, Nikita D. Prasolov, Lars Grieger, Yixin Wang, Vladimir I. Kozlovsky, Mikhail Zverev, Kseniya Orekhova, V. N. Jmerik |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering monolayer thick GaN/AlN multiple quantum wells Cathodoluminescence medicine.disease_cause Article law.invention symbols.namesake law plasma-assisted beam epitaxy Electron beam processing medicine General Materials Science QD1-999 Electron gun business.industry electron-beam pumped ultraviolet-C emitters III-nitrides Cathode Chemistry Stark effect Quantum dot symbols Optoelectronics business Ultraviolet Molecular beam epitaxy |
| Zdroj: | Nanomaterials Nanomaterials, Vol 11, Iss 2553, p 2553 (2021) Volume 11 Issue 10 |
| ISSN: | 2079-4991 |
| Popis: | Monolayer (ML)-scale GaN/AlN multiple quantum well (MQW) structures for electron-beam-pumped ultraviolet (UV) emitters are grown on c-sapphire substrates by using plasma-assisted molecular beam epitaxy under controllable metal-rich conditions, which provides the spiral growth of densely packed atomically smooth hillocks without metal droplets. These structures have ML-stepped terrace-like surface topology in the entire QW thickness range from 0.75–7 ML and absence of stress at the well thickness below 2 ML. Satisfactory quantum confinement and mitigating the quantum-confined Stark effect in the stress-free MQW structures enable one to achieve the relatively bright UV cathodoluminescence with a narrow-line (~15 nm) in the sub-250-nm spectral range. The structures with many QWs (up to 400) exhibit the output optical power of ~1 W at 240 nm, when pumped by a standard thermionic-cathode (LaB6) electron gun at an electron energy of 20 keV and a current of 65 mA. This power is increased up to 11.8 W at an average excitation energy of 5 µJ per pulse, generated by the electron gun with a ferroelectric plasma cathode at an electron-beam energy of 12.5 keV and a current of 450 mA. |
| Databáze: | OpenAIRE |
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