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Title: Chemical-free n-type and p-type multilayer-graphene transistors

Here, a single-step doping method to fabricate n- and p-type multilayer graphene (MG) top-gate field effect transistors (GFETs) is demonstrated. The transistors are fabricated on soda-lime glass substrates, with the n-type doping of MG caused by the sodium in the substrate without the addition of external chemicals. Placing a hydrogen silsesquioxane (HSQ) barrier layer between the MG and the substrate blocks the n-doping, resulting in p-type doping of the MG above regions patterned with HSQ. The HSQ is deposited in a single fabrication step using electron beam lithography, allowing the patterning of arbitrary sub-micron spatial patterns of n- and p-type doping. When a MG channel is deposited partially on the barrier and partially on the glass substrate, a p-type and n-type doping profile is created, which is used for fabricating complementary transistors pairs. Unlike chemically doped GFETs in which the external dopants are typically introduced from the top, these substrate doped GFETs allow for a top gate which gives a stronger electrostatic coupling to the channel, reducing the operating gate bias. Overall, this method enables scalable fabrication of n- and p-type complementary top-gated GFETs with high spatial resolution for graphene microelectronic applications.
 [1] ;  [2]
  1. Voxtel Inc. and Univ. of Oregon, Eugene, OR (United States). Lokey Lab.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy and Dept. of Electrical and Computer Engineering
Publication Date:
Report Number(s):
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 5; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
42 ENGINEERING; 36 MATERIALS SCIENCE; doping; multilayers; amorphous metals; electron beam deposition; field effect transistors; graphene; sodium; electron doped superconductors; Dirac equation
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1283420