The size-dependent phonon frequency of semiconductor nanocrystals

2020-01-18 01:00:51

frequency bond size dependent phonon

责任者: Li-Hong Liang;Cheng-Min Shen;Xi-Ping Chen;Wu-Ming Liu;Hong-Jun Gao 单位: Inst. of Phys., Chinese Acad. of Sci., Beijing, China 来源出处: Journal of Physics: Condensed Matter(J. Phys., Condens. Matter. (UK)),2004/01/28,16(3):267-72 摘要: A model, without adjustable parameters, describing the size-dependent phonon frequency of semiconductor nanocrystals is established based on the size-dependent force constant and thus the size-dependent bond length and bond energy of nanocrystals. This model shows frequency shifts as the size of the crystals decreases. Our predictions agree with the results of experiments for the blue shift of TiO2 nanoparticles, Si and InP quantum dots. The model will be useful for understanding the origins of the phonon behaviour of nanocrystals and the effect of the thermodynamic parameters on the phonon frequency 关键词: binding energy;bond lengths;elemental semiconductors;III-V semiconductors;indium compounds;nanoparticles;phonon spectra;semiconductor quantum dots;silicon;spectral line shift;titanium compounds;size-dependent phonon frequency;semiconductor nanocrystals;size-dependent force constant;size-dependent bond length;bond energy;frequency shifts;blue shift;TiO2 nanoparticles;Si quantum dots;InP quantum dots;thermodynamic parameters;phonon frequency;TiO2;Si;InP