研究目的
Investigating the thermal stability of quaternary alloy BeMgZnO and its phase evolution under different annealing conditions.
研究成果
The investigation provides a deep insight into the thermal stability of the novel quaternary alloy BeMgZnO and is a significant step toward the application of BeMgZnO-based optoelectronic devices. The findings reveal that Be atoms gradually diffuse out from the host position, but Mg and Zn atoms remain, leading to a mixed phase of BeO and MgxZn1?xO. The bandgap of Be0.09Mg0.19Zn0.72O slightly decreases with annealing. An MSM structure photodetector based on the 800 °C annealed sample shows an excellent UV selectivity with a peak responsivity of 90 mA/W under 10 V bias.
研究不足
The crystal quality of Be0.09Mg0.19Zn0.72O deteriorates rapidly as the Be content increases because of the large lattice mismatch. Be can easily occupy the interstitial position of the lattice due to the small Be2+ radius.
1：Experimental Design and Method Selection:
The Be
2：09Mg19Zn72O alloy film was prepared on a c-sapphire substrate by rf plasma assisted molecular beam epitaxy (rf-MBE). High purity elemental Zn, Mg, and Be were used as sources. The aging experiment of the as-grown sample was carried out under two conditions:
(1) 600～800 °C for 1 h in ambient O2; (2) 600 °C for 1, 2, and 3 h in ambient O
3：Sample Selection and Data Sources:
The samples were characterized using X-ray diffraction (XRD), photoluminescence (PL) spectra, absorption spectra, X-ray photoelectron spectra (XPS), and secondary ion mass spectrometry (SIMS).
4：List of Experimental Equipment and Materials:
rf-MBE system, high purity elemental Zn, Mg, and Be, c-sapphire substrate, X-ray diffractometer, HeCd laser, UV?vis?NIR scanning spectrophotometer, XPS equipment, SIMS equipment.
5：Experimental Procedures and Operational Workflow:
The Be
6：09Mg19Zn72O alloy film was grown for 2 h, and the thickness was ～250 nm. The samples were annealed under different conditions and characterized using various techniques. Data Analysis Methods:
The data were analyzed to study the crystal structure, bandgap, chemical environment of Mg, Zn, and Be, and the depth profile of Be, Mg, Zn, and Al content.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
