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

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 defiend tuning of growth direction and lateral arrangement of the wires. As a result axial at 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 btoh 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 phosphorou-doped Zno wires. Single Zno wire (309 nm thick, 3.99 mu m high) grown on pyramidal base with controlled lateral density by tuning the ZnO template layer in a two-step PLD process. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim