Metal electrode dependent field effect transistors made of lanthanide ion-doped DNA crystals. (8th February 2016)

• Record Type: Journal Article
• Authors: Dugasani, Sreekantha Reddy; Hwang, Taehyun; Kim, Jang Ah; Gnapareddy, Bramaramba; Kim, Taesung; Park, Sung Ha
• Is Part Of: Journal of physics. Volume 49:Number 10(2016)
• Publication Date: 2016-02-08
• Subjects: DNA -- self-assembly -- lanthanide ion -- doping -- metal electrode; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/10/105501
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: We fabricated lanthanide ion (Ln 3+, e.g. Dy 3+, Er 3+, Eu 3+, and Gd 3+ )-doped self-assembled double-crossover (DX) DNA crystals grown on the surface of field effect transistors (FETs) containing either a Cr, Au, or Ni electrode. Here we demonstrate the metal electrode dependent FET characteristics as a function of various Ln 3+ . The drain–source current ( I ds ), controlled by the drain–source voltage ( V ds ) of Ln 3+ -doped DX DNA crystals with a Cr electrode on an FET, changed significantly under various gate voltages ( V g ) due to the relative closeness of the work function of Cr to the energy band gap of Ln 3+ -DNA crystals compared to those of Au and Ni. For Ln 3+ -DNA crystals on an FET with either a Cr or Ni electrode at a fixed V ds, I ds decreased with increasing V g ranging from −2 to 0 V and from 0 to +3 V in the positive and negative regions, respectively. By contrast, I ds for Ln 3+ -DNA crystals on an FET with Au decreased with increasing V g in only the positive region due to the greater electronegativity of Au. Furthermore, Ln 3+ -DNA crystals on an FET exhibited behaviour sensitive to V g due to the appreciable charge carriers generated from Ln 3+ . Finally, we address the resistivity and the mobility of Ln 3+ -DNA crystals on an FET with different metal electrodes obtained from I ds – V ds and I ds – V g curves. The resistivities of Ln 3+ -DNA crystals on FETs with Cr and Au electrodes were smaller than those of pristine DNA crystals on an FET, and the mobility of Ln 3+ -DNA crystals on an FET with Cr was relatively higher than that associated with other electrodes.