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

Abstract

Abstract ZnO‐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 MgZnOZnO nano quantum dots and homogeneous radial nano core‐shell 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 µm high) grown on pyramidal base with controlled lateral density by tuning the ZnO template layer in a two‐step PLD process. magnified image