Self‐organized growth of ZnO‐based nano‐ and microstructures

Abstract

-leipzig.de/$hlp/, Phone: þ49 341 97 32651, Fax: þ49 341 97 32668ZnO-based nano-and micro-structures with controlled orientation, size, and lateral density were grown by specially designed two-step pulsed laser deposition and direct carbothermal growth, respectively. Different substrate orientations and nucleation layers allow well-defined tuning of growth direction and lateral arrangement of the wires. As a result, axial MgZnOZnO nano quantum dots and homogeneous radial nano coreshell quantum well structures are demonstrated. Donor and acceptor doping of nano-and microwires influence considerably both electrical characteristics as well as morphology including branching. Field effect transistors with n-and p-type wire channel and nanowire p-n junctions seem to prove a reproducible p-type conductivity of phosphorous-doped ZnO wires.Single ZnO wire (309 nm thick, 3.99 mm high) grown on pyramidal base with controlled lateral density by tuning the ZnO template layer in a two-step PLD process.

Nickel‐related defects in ZnO – A deep‐level transient spectroscopy and photo‐capacitance study

“…1 Introduction The wide band gap semiconductor zinc oxide (ZnO) is often considered to be one of the most promising candidates for future opto-electronic devices and a suitable material system for interesting basic research, for example, in the fields of spintronics [1], nanostructured systems [2] and Bose-Einstein condensation [3]. As its physical properties -such as charge carrier concentration and optical absorption -strongly depend on incorporated defects, a profound knowledge of intrinsic and extrinsic defects occurring in this material system is required.…”

Zinc Oxide Nanophotonics

“…where τ 21 and τ 23/31 are decay rates for radiative and the metastable states, respectively. A source for g 2 (0) > 1 is described as bunched since there is an enhanced probability of two photons being emitted within a short time delay.…”

“…However, an advantageous feature of ZnO is the ability to be grown and structured indifferent geometrics and shapes. In addition, it has excellent piezoelectric and electrical properties [19][20][21]. Among various kinds of optical resonators, cavities that support whispering-gallery modes (WGMs) are particularly interesting due to their ease of fabrication.…”

Architecture of nano‐ and microdimensional building blocks

“…Details are given in ten subsequent publications [2][3][4][5][6][7][8][9][10][11] and previously published reviews on nanoscrolls [12], ion beam fabrication [13,14], and mathematically rigorous theory of strained thin films [15][16][17].…”

“…For nanowires made from GaAs [4], InAs [18], and GaN [19] metal-organic chemical vapor deposition (MOVPE) has been used. For ZnO [2] and (Mg,Zn)O [20], pulsed laser deposition (PLD) was employed. The thermodynamics of the vapor-liquidsolid (VLS) growth mechanism of GaAs nanowires has been investigated in detail [4].…”