Optoelectronic Properties Of Silicon-based Composite Nano-Structures By Au Nanoparticles SPR-modulation

The local surface plasmon resonance (LSPR) properties of metal nanostructurescan be employed to realize the high-efficiency photon-absorption on the surface ofsemiconductor composite nanostructures,which will efficiently enhance thephoto-electricity at the interface of metal/semiconductor. Based on the aboveprinciples, the research for “the photo-electrical properties of silicon-basednanocomposite heterostructures modulated by LSPR in Au nanoparticles” ispresented in this thesis, and the contribution of SPR from metlal nanoparticles to theenhancement of photo-electrical conversion efficiency in semiconductor devices isdiscussed.The main contents in this thesis include: surface photoconduction of silicon(porous silicon.PS) modulated by LSPR in mental nanoparticles. photoconductanceof Si/ZnO heterostructured modulated by LSPR in metal nanoparticles,andphotoconduction of SiC crystal modulated by LSPR in metal nanoparticles. Thecomparisons of the photoconduction properties between Au/(PS)/ZnO/Au andAu/Si/ZnO/Au composite schottky divdes structures is also presented.The effect ofPS layer on the performance of as-fabricated devices is discussed, and the effect ofLSPR in metal nanoparticles to the photo-electrical conversion is studied. At last,itis concluded that SPR of metal nanoparticles can enhance the light-absorbing abilityof Si,ZnO and SiC samples,and therefore enhance the photo-electrical response. Dueto the limitation of annealing temperature,the photo-elelctrical conversion ability ofPS samples can hardly be enhanced,which may be resulted from the high-resistancesurface oxided layer on top of the porous silicon sample.Through the studies in this thesis,some primary experimental results havebeen collected for the research of new-type photo-eletrical devices based on theprinciple of LSPR enhanced photo-electrical conversion process.