title: Electroluminescence from ZnO/Si-nanotips light-emitting diodes.
abstract: A new and general approach to achieving efficient electrically driven light emission from a Si-based nano p-n junction array is introduced. A wafer-scale array of p-type silicon nanotips were formed by a single-step self-masked dry etching process, which is compatible with current semiconductor technologies. On top of the silicon nanotip array, a layer of n-type ZnO film was grown by pulsed laser deposition. Both the narrow line width of 10 nm in cathodoluminescence spectra and the appearance of multiphonon Raman spectra up to the fourth order indicate the excellent quality of the ZnO film. The turn-on voltage of our ZnO/Si nanotip array is found to be approximately 2.4 V, which is 2 times smaller than its thin film counterpart. Moreover, electroluminescence (EL) from our ZnO/Si nanotips array light-emitting diode (LED) has been demonstrated. Our results could open up new possibilities to integrate silicon-based optoelectronic devices, such as highly efficient LEDs, with standard Si ultralarge-scale integrated technology.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Hsieh
authors.forename: Hsin-Yi
authors.initials: HY
authors.lastname: Chen
authors.forename: Ming-Zhang
authors.initials: MZ
authors.lastname: Lin
authors.forename: Shu-Chia
authors.initials: SC
authors.lastname: Shiu
authors.forename: Mario
authors.initials: M
authors.lastname: Hofmann
authors.forename: Ming-Yau
authors.initials: MY
authors.lastname: Chern
authors.forename: Xiaoting
authors.initials: X
authors.lastname: Jia
authors.forename: Ying-Jay
authors.initials: YJ
authors.lastname: Yang
authors.forename: Hsiu-Ju
authors.initials: HJ
authors.lastname: Chang
authors.forename: Hsuan-Ming
authors.initials: HM
authors.lastname: Huang
authors.forename: Shao-Chin
authors.initials: SC
authors.lastname: Tseng
authors.forename: Li-Chyong
authors.initials: LC
authors.lastname: Chen
authors.forename: Kuei-Hsien
authors.initials: KH
authors.lastname: Chen
authors.forename: Ching-Fuh
authors.initials: CF
authors.lastname: Lin
authors.forename: Chi-Te
authors.initials: CT
authors.lastname: Liang
authors.forename: Yang-Fang
authors.initials: YF
authors.lastname: Chen