Nano Archive

Ultrafast electron and hole dynamics in germanium nanowires

Prasankumar, R. P. and Choi, S and Trugman, S. A. and Picraux, S. T. and Taylor, A. J. (2008) Ultrafast electron and hole dynamics in germanium nanowires. NANO LETTERS, 8 (6). pp. 1619-1624.

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We present the first ultrafast time-resolved optical measurements, to the best of our knowledge, on ensembles of germanium nanowires. Vertically aligned germanium nanowires with mean diameters of 18 and 30 nm are grown on (111) silicon substrates through chemical vapor deposition. We optically inject electron-hole. pairs into the nanowires and exploit the indirect band structure of germanium to separately probe electron and hole dynamics with femtosecond time resolution. We find that the lifetime of both electrons and holes decreases with decreasing nanowire diameter, demonstrating that surface effects dominate carrier relaxation in semiconductor nanowires.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanoelectronics
ID Code:1454
Deposited By:Farnush Anwar
Deposited On:12 Dec 2008 14:32
Last Modified:19 Feb 2009 10:27

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