%A Huang Wei-Qi(黄伟其), Liu Jia-Xing(刘家兴), Cai Cheng-Lan(蔡成兰), Lü Quan(吕泉), Liu Shi-Rong(刘世荣), and Qin Chao-Jian(秦朝建) %T Role of nitrogen and oxygen in emission of Si quantum dots formed by pulse laser %0 Journal Article %D 2010 %J Chin. Phys. B %R 10.1088/1674-1056/19/9/097801 %P 97801-097801 %V 19 %N 9 %U {https://cpb.iphy.ac.cn/CN/abstract/article_112173.shtml} %8 2010-09-15 %X Silicon quantum dots fabricated by nanosecond pulsed laser in nitrogen, oxygen or air atmosphere have enhanced photoluminescence (PL) emission with the stimulated emission observed at about 700 nm. It is difficult to distinguish between the photoluminescence peaks emitted from samples prepared in different atmospheres. The reason for the appearance of similar peaks may be the similar distribution of the localised states in the gap for different samples when silicon dangling bonds of quantum dots are passivated by nitrogen or oxygen. It is revealed that both the kind and the density of passivated bonds on quantum dot surface prepared in oxygen or nitrogen have a strong influence on the enhancement of PL emission.