The Structure and Photoluminescence Properties of Al : ZnO/Porous Silicon

초록

Al:ZnO (AZO) were deposited on porous silicon (PS) by using the rf-magnetron sputtering technique with different rf-powers. The photoluminescence spectra of the samples before and after deposition of AZO were obtained, to investigate the effect of PS on the luminescence properties of AZO/PS composites. The AZO film emits blue light, due to the oxygen-related vacancies existing in the films. On the other hand, as-deposited PS emits green light. The green peak of PS shifts to the blue region after AZO deposition. Also, oxidation of Si atoms will lead to a blue shift of the emission from PS, due to the additional potential modulation with the Si nanocrystallites by a long-range Coulombic interaction of oxygen ions.