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Optical Properties of Crystalline-Amorphous Core-Shell Silicon Nanowires
 

Summary: Optical Properties of Crystalline-Amorphous
Core-Shell Silicon Nanowires
M. M. Adachi,*,
M. P. Anantram,
and K. S. Karim

Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada,
and
Department of Electrical Engineering, University of Washington, Seattle, Washington 98195
ABSTRACT The optical absorption in a nanowire heterostructure consisting of a crystalline silicon core surrounded by a conformal
shell of amorphous silicon is studied. We show that they exhibit extremely high absorption of 95% at short wavelengths ( < 550
nm) and a concomitant very low absorption of down to less than 2% at long wavelengths ( > 780 nm). These results indicate that
our nanowires do not have optically active energy levels in the band gap. The absorption edge of silicon nanowires arrays is observed
to shift to longer wavelengths as a function of the overall nanowire diameter. The near-infrared absorption of the nanowire array is
significantly better than that of thin film amorphous silicon. These properties indicate potential use in large area optoelectronic and
photovoltaic applications.
KEYWORDS Silicon nanowires, heterostructure, optical properties, absorption, reflectance
S
ilicon nanowires have attracted much interest due to
potential advantageous optical,1,2

  

Source: Anantram, M. P. - Department of Electrical Engineering, University of Washington at Seattle

 

Collections: Materials Science; Computer Technologies and Information Sciences