title: Nickel/Platinum Dual Silicide Axial Nanowire Heterostructures with Excellent Photosensor Applications.
abstract: Transition metal silicide nanowires (NWs) have attracted increasing attention as they possess advantages of both silicon NWs and transition metals. Over the past years, there have been reported with efforts on one silicide in a single silicon NW. However, the research on multicomponent silicides in a single silicon NW is still rare, leading to limited functionalities. In this work, we successfully fabricated β-Pt2Si/Si/θ-Ni2Si, β-Pt2Si/θ-Ni2Si, and Pt, Ni, and Si ternary phase axial NW heterostructures through solid state reactions at 650 °C. Using in situ transmission electron microscope (in situ TEM), the growth mechanism of silicide NW heterostructures and the diffusion behaviors of transition metals were systematically studied. Spherical aberration corrected scanning transmission electron microscope (Cs-corrected STEM) equipped with energy dispersive spectroscopy (EDS) was used to analyze the phase structure and composition of silicide NW heterostructures. Moreover, electrical and photon sensing properties for the silicide nanowire heterostructures demonstrated promising applications in nano-optoeletronic devices. We found that Ni, Pt, and Si ternary phase nanowire heterostructures have an excellent infrared light sensing property which is absent in bulk Ni2Si or Pt2Si. The above results would benefit the further understanding of heterostructured nano materials.
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Yen-Ting
authors.initials: YT
authors.lastname: Wu
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Chung-Hua
authors.initials: CH
authors.lastname: Chiu
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Chia-Fu
authors.initials: CF
authors.lastname: Chang
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Jui-Yuan
authors.initials: JY
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Ting-Yi
authors.initials: TY
authors.lastname: Lin
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, National Cheng Kung University , No. 1, University Road, Tainan City 70101, Taiwan.
authors.forename: Kuo-Chang
authors.initials: KC
authors.lastname: Lu
authors.affiliation: Department of Physics, Tamkang University , No. 151, Yingzhuan Road, Tamsui District, New Taipei City 25137, Taiwan.
authors.forename: Ping-Hung
authors.initials: PH
authors.lastname: Yeh
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University , No. 1001, University Road, East District, Hsinchu City 30010, Taiwan.
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Wu
keywords: Silicide; heterostructure; in situ TEM; nanowires; photosensor; ternary phase