High-Quality AlN Template Prepared by Face-to-Face Annealing of Sputtered AlN on Sapphire

This study comprehensively investigates the properties of metalorganic vapor phase epitaxy (MOVPE)-grown AlN films on high-quality face-to-face annealed sputtered AlN (FFA Sp-AlN) templates on sapphire substrates, which are highly important to control the surface morphology for various applications, such as UV light-emitting diodes and laser diodes. The conditions of thermal cleaning and AlN growth by MOVPE are investigated to remove numerous small islands on as-annealed FFA Sp-AlN. Subsequent to thermal cleaning in H-2 + NH3 at 1300 degrees C, MOVPE growth is performed with varying NH3 flow rate and growth temperature (T-g) under a constant pressure and group-III flow rate. An atomically flat surface with an atomic step-and-terrace structure is obtained at a growth rate of approximate to 1.0 mu m h(-1) and a T-g of 1300 degrees C. Transmission electron microscopy images and secondary-ion mass spectrometry reveal low dislocation densities and impurity concentrations. Finally, the effects of compressive strain in FFA Sp-AlN on the lattice constant and curvature of the MOVPE-grown AlN film on FFA Sp-AlN are investigated. The compressive strain of the AlN film, which is carried over from FFA Sp-AlN, can prevent crack formation but leads to a large wafer curvature after cooling down from the T-g.

Automated summary

This study comprehensively investigated the properties of MOVPE-grown AlN films on FFA Sp-AlN templates, focusing on controlling surface morphology through thermal cleaning and growth conditions optimization. Results showed an atomically flat surface was achieved with low dislocation densities, but compressive strain in FFA Sp-AlN influenced the lattice constant and curvature of the AlN film grown by MOVPE.