Presentations

    Black silicon: A new light absorber for solar cells and photodetectors, at OSA Annual Meeting (Baltimore, MD), Thursday, October 1, 1998
    We demonstrate a new light absorber for solar cells and optical detection devices. Micron-sized spikes generated by irradiating a silicon surface with femtosecond laser pulses in SF6 enhance light absorption in silicon to near 100%. We observe an increase of more than 60% in photocurrent compared to a flat silicon surface.
    Black silicon: A new light absorber for photovoltaic applications, at APS Centennial Meeting 1999 (Atlanta, GA), Tuesday, March 23, 1999:
    We demonstrate a new technique for texturing silicon surfaces using femtosecond laser pulses. Sharp micron-sized spikes are created by repeatedly irradiating a silicon surface with femtosecond laser pulses in the presence of SF6. The spikes are highly light-absorbing and enhance the light absorption in silicon close to 100 (increase in photocurrent of more than 60) over flat silicon. Spiked silicon is of potential use as a highly efficient light-absorber for solar cells and photodetectors.
    Black Silicon, at XI International Symposium Ultrafast Phenomena in Spectroscopy, Academia Sinica (Taipei, Taiwan), Monday, October 25, 1999: