Abstract
The structure and photoluminescent properties of films obtained by modified laser-inducedforward transfer of silicon are presented. Strong variations in structure with ambient gascomposition are observed: in Ar, porous films of mutually agglomerated siliconnanoparticles are observed, while in air the films consist of a network of hyperbranchednanowires (SiHBNWs) whose diameter varies periodically along their length, and which arecomposed of crystalline silicon nanoparticles surrounded and interconnected by amorphoussilicon oxide of varying stoichiometry. The mechanisms of formation of the structures aredwelt upon and explained in term of dynamics within the plume. For the SiHBNWs, thepioneering use of fluorescence imaging was employed to obtain evidence for thephotoluminescence originating from the crystalline nanoparticles themselves, and origins ofthe emission bands are thus attributed to radiative recombination of excitons at theSi/SiO2 interface accordingly.
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