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Title: Electronic Transport Properties of Epitaxial Si/SiGe Heterostructures Grown on Single-Crystal SiGe Nanomembranes

Journal Article · · ACS Nano
DOI:https://doi.org/10.1021/nn506475z· OSTI ID:1783687
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1];  [4];  [1];  [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of Wisconsin, Madison, WI (United States); Western Digital, Irvine, CA (United States)
  3. Univ. of Wisconsin, Madison, WI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Wisconsin, Madison, WI (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Here, in order to assess possible improvements in the electronic performance of two-dimensional electron gases (2DEGs) in silicon, SiGe/Si/SiGe heterostructures are grown on fully elastically relaxed single-crystal SiGe nanomembranes produced through a strain engineering approach. This procedure eliminates the formation of dislocations in the heterostructure. Top-gated Hall bar devices are fabricated to enable magnetoresistivity and Hall effect measurements. Both Shubnikov-de Haas oscillations and the quantum Hall effect are observed at low temperatures, demonstrating the formation of high-quality 2DEGs. Values of charge carrier mobility as a function of carrier density extracted from these measurements are at least as high or higher than those obtained from companion measurements made on heterostructures grown on conventional strain graded substrates. In all samples, impurity scattering appears to limit the mobility.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); US Army Research Office (ARO); National Science Foundation (NSF)
Grant/Contract Number:
FG02-03ER46028; W911NF-12-0607; DMR-1206915
OSTI ID:
1783687
Journal Information:
ACS Nano, Vol. 9, Issue 5; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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