Resonant electron transfer and luminescent enhancement in a toluene suspension of Si nanocrystals.
Efficient resonant electron transfer from the surface bonding structure to the conduction band of quantum confined Si nanocrystals is observed by Si nanocrystals in a toluene suspension. Based on the electron transfer mechanism, the enhancement of photoluminescence originates from the band-to-band recombination in the p-type Si nanocrystals suspended in a toluene solution. The energy levels of the electrons in the Si nanocrystals chemisorbed with toluene molecules are calculated using the method of linear combination of atomic orbitals, and the characteristics of the obtained density of states is in good agreement with the observed photoluminescence properties.
Wu
X L
XL
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China. hkxlwu@nju.edu.cn
Qiu
T
T
Hu
D S
DS
Huang
G S
GS
Yuan
R K
RK
Siu
G G
GG
Chu
Paul K
PK