Investigations on the two photoluminescence peaks feature and the light-emitting mechanism of porous silicor

Interest in porous silicon (PS) has greatly increased since the discovery of its visible light emission. Understanding of the visible photoluminescence (PL) spectra of PS is one of the most important aspects of researches on porous silicon. Early studies focused on the observation of a single peak in the PL spectra. Recently, multiple peak features in the low-temperature PL spectra of PS samples as-prepared or dry-oxidized were reported.In this note, we report the observation of two PL peaks at room temperature on treated PS samples. We will discuss how the treatment conditions affect the characteristics of the