研究目的
To investigate the dependences of the spectral-lasing characteristics of an array of zinc-oxide microcrystals on their morphology, degree of disorder in the array, and presence of copper impurity.
研究成果
The presence of a copper nanolayer on sapphire substrates increases the ZnO band-edge emission intensity, reduces the lasing threshold, and causes a blue shift of the radiation peak. The morphology of the ZnO microcrystal arrays significantly affects their optical properties, with stochastic lasing observed in disordered arrays and lasing with rods as cavities in ordered arrays.
研究不足
The study does not provide a detailed mechanism for the electron transition from Cu to ZnO, suggesting the need for further investigations. The work function for ZnO varies widely, making it difficult to establish the type of contact between ZnO and Cu definitively.
1：Experimental Design and Method Selection:
Arrays of zinc-oxide microrods were grown by chemical vapor deposition according to the VLS mechanism.
2：Sample Selection and Data Sources:
The arrays were grown on sapphire(0001) substrates with and without a preliminarily deposited 15-nm-thick copper layer.
3：List of Experimental Equipment and Materials:
A laboratory setup with a continuous-flow quartz reactor, zinc powder, high-purity argon and oxygen, a JEOL JSM-6000PLUS electron microscope for electron microscopy and energy-dispersive microanalysis, and a Nd:YAG laser for optical radiation excitation.
4：Experimental Procedures and Operational Workflow:
The synthesis involved varying temperatures in the growth and evaporation zones, with the synthesis duration being 20 min.
5：Data Analysis Methods:
The emission spectra were measured by photoluminescence spectroscopy, and the morphology was analyzed using SEM and AFM.
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
