Conductivity mechanisms in Sb-doped SnO.sub.2./sub. nanoparticle assemblies: DC and terahertz regime

0451174 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Skoromets, Volodymyr - Němec, Hynek - Kopeček, Jaromír - Kužel, Petr
Conductivity mechanisms in Sb-doped SnO₂ nanoparticle assemblies: DC and terahertz regime.
Journal of Physical Chemistry C. Roč. 119, č. 33 (2015), s. 19485-19495. ISSN 1932-7447. E-ISSN 1932-7455
Grant CEP: GA MŠMT(CZ) LM2011029; GA ČR GA13-12386S; GA MŠMT LO1409
Grant ostatní: AVČR(CZ) M100101218; SAFMAT(XE) CZ.2.16/3.1.00/22132; FUNBIO(XE) CZ.2.16/3.1.00/21568
Institucionální podpora: RVO:68378271
Klíčová slova: semiconductor nanoparticles * terahertz spectroscopy * effective medium approximation
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 4.509, rok: 2015

Assemblies of tin oxide nanoparticles synthesized via a nonaqueous sol–gel procedure annealed under various conditions were investigated using terahertz spectroscopy, scanning electron microscopy, atomic force microscopy, and dc conductivity measurements. Combination of these methods made it possible to resolve the conductivity limitations imposed by intrinsic properties of the material and by the morphology of the samples. Percolation of the nanoparticles was confirmed in all samples. The undoped samples exhibit a weak hopping conductivity, while bandlike conduction of charges partially confined in the nanoparticles dominates in the doped samples. The conductivity of nanoparticles and their connectivity can be greatly controlled during the sample preparation, namely by the calcination temperature and by the order of technological steps. A substantial increase of the conductivity inside nanoparticles and of the charge transport between them is achieved upon calcination at 500°C.
Trvalý link: http://hdl.handle.net/11104/0252376