Unveiling interfacial dead layer in wurtzite ferroelectrics

Ferroelectric ScAlN/GaN heterostructure

As illustrated in Fig. 1a, a 70-nm-thick Sc_0.18Al_0.82N film was grown on 2-inch GaN/sapphire templates by MBE. The ScAlN film exhibited an atomically smooth surface and a single crystalline c-axis texture,…