Role of self-assembled gold nanodots in improving the electrical and optical characteristics of zinc oxide films.
We have studied the effect of embedding nanocrystalline Au particles on the electrical and optical characteristics of ZnO films. Au-embedded epitaxial ZnO films were deposited on (0001) sapphire substrates with a pulsed laser deposition technique. The crystalline quality of both the ZnO matrix and Au nanoparticles was investigated by X-ray diffraction and transmission electron microscopy. Composite films were characterized by photoluminescence, optical absorption, and low-temperature electrical resistivity measurements. Photoluminescence spectra of theses films showed a sharp excitonic peak at 3.22 +/- 0.05 eV without any signature of green band emission. Electrical resistivity measurements showed these films to be highly conducting, with a room-temperature resistivity of 3.4 +/- 0.2 m omega-cm.
Tiwari
Ashutosh
A
NSF Center of Advanced Materials & Smart Structures, Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695-7916, USA.
Chugh
A
A
Jin
C
C
Narayan
J
J
D003460:Crystallization / Q000379:methods*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004581:Electronics / Q000295:instrumentation / Q000379:methods; D005453:Fluorescence; D006046:Gold / Q000737:chemistry*; D008027:Light; D046911:Macromolecular Substances; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods; D045663:Quantum Dots; D013499:Surface Properties; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry* / Q000528:radiation effects*
D046911:Macromolecular Substances; D008567:Membranes, Artificial; D006046:Gold; D015034:Zinc Oxide