Intensity Ratio of the Doublet Signature of Excitons Bound to 3C-SiC Stacking Faults in a 4H-SiC Matrix

Abstract

In 4H-SiC, 3C stacking fault (SF) behaves like a finite thickness type II quantum well. As a consequence, it can bind two excitons per well. We show in this work that, as the SF thickness increases, the relative intensity of the two transitions changes. This comes from a change in the wave functions overlap between the electron trapped in the well and the holes trapped neighbouring parts of the 4H-SiC matrix.