Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO

Details Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO

2008-11-12

arxiv.org/abs/0811.1924v1

Nanotechnology 19 (2008) 485701

Physics

Condensed Matter

Materials Science

8 pages, 7 figures

Scientific paper

10.1088/0957-4484/19/48/485701

Charge transport properties of thin films of sol--gel processed undoped and Al-doped zinc oxide nanoparticles with variable doping level between 0.8 at% and 10 at% were investigated. The X-ray diffraction studies revealed a decrease of the average crystallite sizes in highly doped samples. We provide estimates of the conductivity and the resulting charge carrier densities with respect to the doping level. The increase of charge carrier density due to extrinsic doping were compared to the accumulation of charge carriers in field effect transistor structures. This allowed to assess the scattering effects due to extrinsic doping on the electron mobility. The latter decreases from 4.6*10^-3 cm^2/Vs to 4.5*10^-4 cm^2/Vs with increasing doping density. In contrast, the accumulation leads to an increasing mobility up to 1.5*10^-2 cm^2/Vs. The potential barrier heights related to grain boundaries between the crystallites were derived from temperature dependent mobility measurements. The extrinsic doping initially leads to a grain boundary barrier height lowering, followed by an increase due to doping-induced structural defects. We conclude that the conductivity of sol--gel processed nanocrystalline ZnO:Al is governed by an interplay of the enhanced charge carrier density and the doping-induced charge carrier scattering effects, achieving a maximum at 0.8 at% in our case.

Affiliated with

Also associated with

No associations

Rating

Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of doping-- and field--induced charge carrier density on the electron transport in nanocrystalline ZnO will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-101291