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Proceedings Paper

Black silicon n-type photodiodes with high response over wide spectral range
Author(s): Juha Heinonen; Mikko A. Juntunen; Hannu S. Laine; Ville Vähänissi; Päivikki Repo; Timo Dönsberg; Hele Savin
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Paper Abstract

Commercial photodiodes suffer from reflection losses and different recombination losses that reduce the collection efficiency of photogenerated charge carriers. Recently, we realized a near-ideal silicon photodiode, which steps closer to the physical performance limits of silicon photodiodes than any other silicon photodiode realized before. Our device exhibits an external quantum efficiency above 95% over the wavelength range of 235 – 980 nm, and provides a very high response at incident angles of up to 70 degrees. The high quantum efficiency is reached by 1) virtually eliminating front surface reflectance by forming a “black silicon” nanostructured surface having dimensions in the range of wavelength of optical light and 2) using an induced junction for signal collection, formed by negatively charged alumina, instead of a conventional doped p-n junction. Here, we describe the latest efforts in further development of the photodiode technology. In particular, we report improvements both in the short wavelength response via better control of the surface quality, and superior response to photons with energies close to the silicon bandgap.

Paper Details

Date Published: 16 May 2017
PDF: 6 pages
Proc. SPIE 10231, Optical Sensors 2017, 102310X (16 May 2017); doi: 10.1117/12.2264998
Show Author Affiliations
Juha Heinonen, Aalto Univ. (Finland)
Mikko A. Juntunen, Aalto Univ. (Finland)
Helsinki Institute of Physics (Finland)
Hannu S. Laine, Aalto Univ. (Finland)
Ville Vähänissi, Aalto Univ. (Finland)
Päivikki Repo, Aalto Univ. (Finland)
Timo Dönsberg, Aalto Univ. (Finland)
Hele Savin, Aalto Univ. (Finland)

Published in SPIE Proceedings Vol. 10231:
Optical Sensors 2017
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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