title: Ultra-low Doping on Two-Dimensional Transition Metal Dichalcogenides using DNA Nanostructure Doped by a Combination of Lanthanide and Metal Ions.
abstract: Here, we propose a novel DNA-based doping method on MoS2 and WSe2 films, which enables ultra-low n- and p-doping control and allows for proper adjustments in device performance. This is achieved by selecting and/or combining different types of divalent metal and trivalent lanthanide (Ln) ions on DNA nanostructures, using the newly proposed concept of Co-DNA (DNA functionalized by both divalent metal and trivalent Ln ions). The available n-doping range on the MoS2 by Ln-DNA is between 6 × 10(9) and 2.6 × 10(10 ) cm(-2). The p-doping change on WSe2 by Ln-DNA is adjusted between -1.0 × 10(10) and -2.4 × 10(10 ) cm(-2). In Eu(3+) or Gd(3+)-Co-DNA doping, a light p-doping is observed on MoS2 and WSe2 (~10(10 ) cm(-2)). However, in the devices doped by Tb(3+) or Er(3+)-Co-DNA, a light n-doping (~10(10 ) cm(-2)) occurs. A significant increase in on-current is also observed on the MoS2 and WSe2 devices, which are, respectively, doped by Tb(3+)- and Gd(3+)-Co-DNA, due to the reduction of effective barrier heights by the doping. In terms of optoelectronic device performance, the Tb(3+) or Er(3+)-Co-DNA (n-doping) and the Eu(3+) or Gd(3+)-Co-DNA (p-doping) improve the MoS2 and WSe2 photodetectors, respectively. We also show an excellent absorbing property by Tb(3+) ions on the TMD photodetectors.
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kang
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.|SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Sreekantha Reddy
authors.initials: SR
authors.lastname: Dugasani
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Hyung-Youl
authors.initials: HY
authors.lastname: Park
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Jaewoo
authors.initials: J
authors.lastname: Shim
authors.affiliation: SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Bramaramba
authors.initials: B
authors.lastname: Gnapareddy
authors.affiliation: SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Jaeho
authors.initials: J
authors.lastname: Jeon
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.|SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Sungjoo
authors.initials: S
authors.lastname: Lee
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.|SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Yonghan
authors.initials: Y
authors.lastname: Roh
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.|SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Sung Ha
authors.initials: SH
authors.lastname: Park
authors.affiliation: School of Electronics and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Jin-Hong
authors.initials: JH
authors.lastname: Park
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry; D018011:Chalcogens / Q000737:chemistry / Q000378:metabolism*; D004247:DNA / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D028561:Transition Elements / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D018011:Chalcogens; D007477:Ions; D028581:Lanthanoid Series Elements; D028561:Transition Elements; D004247:DNA
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