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Study of photocurrent generation in InP nanowire-based p(+)-i-n(+) photodetectors

Jain, Vishal LU ; Nowzari, Ali LU ; Wallentin, Jesper LU ; Borgström, Magnus LU ; Messing, Maria LU ; Asoli, Damir; Graczyk, Mariusz LU ; Witzigmann, Bernd; Capasso, Federico and Samuelson, Lars LU , et al. (2014) In Nano Reseach 7(4). p.544-552
Abstract
We report on electrical and optical properties of p(+)-i-n(+)photodetectors/solar cells based on square millimeter arrays of InP nanowires (NWs) grown on InP substrates. The study includes a sample series where the p(+)-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p(+)-segment length. Without a p(+)-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a... (More)
We report on electrical and optical properties of p(+)-i-n(+)photodetectors/solar cells based on square millimeter arrays of InP nanowires (NWs) grown on InP substrates. The study includes a sample series where the p(+)-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p(+)-segment length. Without a p(+)-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a p(+)-segment decouples the substrate and shifts the depletion region, and collection of photogenerated carriers, to the NWs, in agreement with theoretical modeling. In optimized solar cells, clear spectral signatures of interband transitions in the zinc blende and wurtzite InP layers of the mixed-phase i-segments are observed. Complementary electroluminescence, transmission electron microscopy (TEM), as well as measurements of the dependence of the photocurrent on angle of incidence and polarization, support our interpretations. (Less)
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publication status
published
subject
keywords
nanophotonics, nanowires, infrared (IR), photodetectors, solar cells
in
Nano Reseach
volume
7
issue
4
pages
544 - 552
publisher
Springer
external identifiers
  • wos:000339891100011
  • scopus:84899915356
ISSN
1998-0124
DOI
10.1007/s12274-014-0422-2
language
English
LU publication?
yes
id
050c1a13-806b-4053-9800-56b07fc0d236 (old id 4668128)
date added to LUP
2014-09-25 13:58:02
date last changed
2017-08-06 03:02:37
@article{050c1a13-806b-4053-9800-56b07fc0d236,
  abstract     = {We report on electrical and optical properties of p(+)-i-n(+)photodetectors/solar cells based on square millimeter arrays of InP nanowires (NWs) grown on InP substrates. The study includes a sample series where the p(+)-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p(+)-segment length. Without a p(+)-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a p(+)-segment decouples the substrate and shifts the depletion region, and collection of photogenerated carriers, to the NWs, in agreement with theoretical modeling. In optimized solar cells, clear spectral signatures of interband transitions in the zinc blende and wurtzite InP layers of the mixed-phase i-segments are observed. Complementary electroluminescence, transmission electron microscopy (TEM), as well as measurements of the dependence of the photocurrent on angle of incidence and polarization, support our interpretations.},
  author       = {Jain, Vishal and Nowzari, Ali and Wallentin, Jesper and Borgström, Magnus and Messing, Maria and Asoli, Damir and Graczyk, Mariusz and Witzigmann, Bernd and Capasso, Federico and Samuelson, Lars and Pettersson, Håkan},
  issn         = {1998-0124},
  keyword      = {nanophotonics,nanowires,infrared (IR),photodetectors,solar cells},
  language     = {eng},
  number       = {4},
  pages        = {544--552},
  publisher    = {Springer},
  series       = {Nano Reseach},
  title        = {Study of photocurrent generation in InP nanowire-based p(+)-i-n(+) photodetectors},
  url          = {http://dx.doi.org/10.1007/s12274-014-0422-2},
  volume       = {7},
  year         = {2014},
}