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Stimulated photoluminescence emission and trap states in Si/SiO2 interface formed by irradiation of laser
Authors:Huang Wei-Qi  Xu Li  Wang Hai-Xu  Jin Feng  Wu Ke-Yue  Liu Shi-Rong  Qin Cao-Jian and Qin Shui-Jie
Institution:Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550003, China; Key Laboratory of Photoelectron Technology and Application, Guizhou University, Guiyang 550026, China
Abstract:Stimulated photoluminescence (PL) emission has been observed from an oxide structure of silicon when optically excited by a radiation of 514nm laser. Sharp twin peaks at 694 and 692nm are dominated by stimulated emission, which can be demonstrated by its threshold behaviour and linear transition of emission intensity as a function of pump power. The oxide structure is formed by laser irradiation on silicon and its annealing treatment. A model for explaining the stimulated emission is proposed, in which the trap states of the interface between an oxide of silicon and porous nanocrystal play an important role.
Keywords:interface states  stimulated emission  oxide structure of silicon  laser irradiation
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