Photoluminescence of Amorphous Multilayer Structures a-C:H/a-Si:H

摘要

The optical absorption edge and the photoluminescence spectra of amorphous hydrogenated diamond-like carbon(a-C:H)films are investigated in the temperature range 4.2-900 K.Low-dimensional multilayer structures alpha-C:H/a-Si:H,in which alpha-C:H with an optical band gap E_g=4.5 eV is used as a barrier,are prepared for the first time.It is found that amorphous hydrogenated silicon(a-Si:H)films with a thickness d< 100 A exhibit quantum-confinement effects.Analysis of the photoluminescence spectra and the optical absorption edge of the alpha-Si:H films shows that the structures omicron-C:H/a-Si:H have a sharp interface and that charge carriers in the alpha-Si:H film undergo quantization.