title: Patterned growth of carbon nanotubes over vertically aligned silicon nanowire bundles for achieving uniform field emission.
abstract: A fabrication strategy is proposed to enable precise coverage of as-grown carbon nanotube (CNT) mats atop vertically aligned silicon nanowire (VA-SiNW) bundles in order to realize a uniform bundle array of CNT-SiNW heterojunctions over a large sample area. No obvious electrical degradation of as-fabricated SiNWs is observed according to the measured current-voltage characteristic of a two-terminal single-nanowire device. Bundle arrangement of CNT-SiNW heterojunctions is optimized to relax the electrostatic screening effect and to maximize the field enhancement factor. As a result, superior field emission performance and relatively stable emission current over 12 h is obtained. A bright and uniform fluorescent radiation is observed from CNT-SiNW-based field emitters regardless of its bundle periodicity, verifying the existence of high-density and efficient field emitters on the proposed CNT-SiNW bundle arrays.
authors.affiliation: Department of Photonics, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan.
authors.forename: Yung-Jr
authors.initials: YJ
authors.lastname: Hung
authors.affiliation: Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.
authors.forename: Yung-Jui
authors.initials: YJ
authors.lastname: Huang
authors.affiliation: Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.
authors.forename: Hsuan-Chen
authors.initials: HC
authors.lastname: Chang
authors.affiliation: Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.
authors.forename: Kuei-Yi
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan.
authors.forename: San-Liang
authors.initials: SL
authors.lastname: Lee
keywords: Carbon nanotube; Electrostatic screening effect; Field emission; Metal-induced chemical etching; Silicon nanowire