Enhancement in optical absorption of silicon fibrous nanostructure produced using femtosecond laser ablation

Mahmood, Abdul Salam; Sivakumar, M.; Venkatakrishnan, Krishnan; Bo Tan
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p034107
Academic Journal
Fibrous nanostructures are proposed for the application of solar cell. Irradiation of silicon surface with a few hundred femtosecond laser pulses of fluence 13 kJ/m2 at 13 MHz pulse frequency in air atmosphere results in the formation of fibrous nanostructure layer on the treated surface that leads to a significant decrease in the reflection of visible radiation. For the visible wavelength, the decreased reflection is a result of the nature of the nanostructure. The Raman peak shift in the irradiated surface confirms that the surface is changed to amorphous silicon due to fibrous nanostructure formation.


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