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Tuning of strain and surface roughness of porous silicon layers for higher-quality seeds for epitaxial growth

Overview of attention for article published in Discover Nano, July 2014
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Title
Tuning of strain and surface roughness of porous silicon layers for higher-quality seeds for epitaxial growth
Published in
Discover Nano, July 2014
DOI 10.1186/1556-276x-9-348
Pubmed ID
Authors

Marwa Karim, Roberto Martini, Hariharsudan Sivaramakrishnan Radhakrishnan, Kris van Nieuwenhuysen, Valerie Depauw, Wedgan Ramadan, Ivan Gordon, Jef Poortmans

Abstract

Sintered porous silicon is a well-known seed for homo-epitaxy that enables fabricating transferrable monocrystalline foils. The crystalline quality of these foils depends on the surface roughness and the strain of this porous seed, which should both be minimized. In order to provide guidelines for an optimum foil growth, we present a systematic investigation of the impact of the thickness of this seed and of its sintering time prior to epitaxial growth on strain and surface roughness. Strain and surface roughness were monitored in monolayers and double layers with different porosities as a function of seed thickness and of sintering time by high-resolution X-ray diffraction and profilometry, respectively. Unexpectedly, we found that strain in double and monolayers evolves in opposite ways with respect to layer thickness. This suggests that an interaction between layers in multiple stacks is to be considered. We also found that if higher seed thickness and longer annealing time are to be preferred to minimize the strain in double layers, the opposite is required to achieve smoother layers. The impact of these two parameters may be explained by considering the morphological evolution of the pores upon sintering and, in particular, the disappearance of interconnections between the porous seed and the bulk as well as the enlargement of pores near the surface. An optimum epitaxial growth hence calls for a trade-off in seed thickness and annealing time, between minimum-strained layers and rougher surfaces.

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The data shown below were compiled from readership statistics for 17 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
India 1 6%
Slovenia 1 6%
Unknown 15 88%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 5 29%
Researcher 4 24%
Student > Doctoral Student 2 12%
Student > Master 2 12%
Professor > Associate Professor 1 6%
Other 0 0%
Unknown 3 18%
Readers by discipline Count As %
Physics and Astronomy 4 24%
Engineering 4 24%
Materials Science 4 24%
Philosophy 1 6%
Unknown 4 24%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 07 January 2015.
All research outputs
#20,655,488
of 25,371,288 outputs
Outputs from Discover Nano
#691
of 1,146 outputs
Outputs of similar age
#176,863
of 241,394 outputs
Outputs of similar age from Discover Nano
#20
of 26 outputs
Altmetric has tracked 25,371,288 research outputs across all sources so far. This one is in the 10th percentile – i.e., 10% of other outputs scored the same or lower than it.
So far Altmetric has tracked 1,146 research outputs from this source. They receive a mean Attention Score of 3.5. This one is in the 30th percentile – i.e., 30% of its peers scored the same or lower than it.
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We're also able to compare this research output to 26 others from the same source and published within six weeks on either side of this one. This one is in the 11th percentile – i.e., 11% of its contemporaries scored the same or lower than it.