Strong infrared photoluminescence in highly porous layers of large faceted Si crystalline nanoparticles.

ABSTRACT: Almost all physical processes in solids are influenced by phonons, but their effect is frequently overlooked. In this paper, we investigate the photoluminescence of large silicon nanoparticles (approximately 100 nm size, synthesized by chemical vapor deposition) in the visible to the infrared detection range. We find that upon increasing laser irradiance, an enormous photoluminescence emission band appears in the infrared. Its intensity exhibits a superlinear power dependence, increasing over four orders of magnitude in the investigated pump power range. Particles of different sizes as well as different shapes in porous layers are investigated. The results are discussed taking into account the efficient generation of phonons under high-power pumping, and the reduced capability, porosity de

SUBMITTER: de Jong EM 

PROVIDER: S-EPMC4877587 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature