Figure 7
From: Fabrication of WS2/GaN p-n Junction by Wafer-Scale WS2 Thin Film Transfer
Valence-band XPS spectra of (a) the top surface and back surface (growth interface) of WS2 grown on sapphire (type B film); (b) the top surface of WS2 grown on GaN (type C film); and (c) GaN film.
