Resonant energy transfer from nanocrystal Si to β-FeSi_2 in hybrid Si/β-FeSi_2 film  

作　　者：何久洋 张祺桢 吴兴龙 朱剑豪 

机构地区：[1]Key Laboratory of Modern Acoustics,MOE,Institute of Acoustics,Department of Physics,Nanjing University [2]Department of Physics,Nanjing Normal University [3]Department of Physics and Materials Science,City University of Hong Kong

出　　处：《Chinese Physics B》2013年第10期52-55,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2011CB922102 and 2013CB932901);the National Natural Science Foundation of China(Grant No.60976063);the Priority Academic Program Development(PAPD)of Higher Education Institutions of Jiangsu Province and HongKong Research Grants Council(RGC)General Research Funds(GRF)(Grant Nos.CityU 112510 and CityU 112212)

摘　　要：The photoluminescence （PL） characteristics of hybrid β-FeSi2/Si and pure β-FeSi2 films fabricated by pulsed laser deposition at 20 K are investigated. The intensity of the 1.54-μm PL from the former is enhanced, but the enhancement vanishes when the excitation wavelength is larger than the widened band gap of Si nanocrystal. Time-resolved PL decay measurements reveal that the lifetime of the photo-excited carriers in the hybrid β-FeSi2/Si film is longer than that in the pure β-FeSi2 film, providing evidence that the PL enhancement results from the resonant charge transfer from nanocrystalline Si to β-FeSi2.The photoluminescence （PL） characteristics of hybrid β-FeSi2/Si and pure β-FeSi2 films fabricated by pulsed laser deposition at 20 K are investigated. The intensity of the 1.54-μm PL from the former is enhanced, but the enhancement vanishes when the excitation wavelength is larger than the widened band gap of Si nanocrystal. Time-resolved PL decay measurements reveal that the lifetime of the photo-excited carriers in the hybrid β-FeSi2/Si film is longer than that in the pure β-FeSi2 film, providing evidence that the PL enhancement results from the resonant charge transfer from nanocrystalline Si to β-FeSi2.

关 键 词：β-FeSi2 nanocrystal photoluminescence resonant charge transfer 

分 类 号：O613.71[理学—无机化学]