On the temperature dependent electrical resistivity of CNT layers in view of Variable Range Hopping models.pdfVIP

Organic Electronics 43 (2017) 253e261 Contents lists available at ScienceDirect Organic Electronics journal homepage: /locate/orgel On the temperature dependent electrical resistivity of CNT layers in view of Variable Range Hopping models Kamil Ke? dzierski a, *, Karol Rytel a, Boles?aw Barszcz b, Anna Gronostaj a, ?ukasz Majchrzycki c, Danuta Wrobel a a Faculty of Technical Physics, Poznan University of Technology, 60-965 Poznan, Poland b Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznan, Poland c Wielkopolska Centre of Advanced Technology, Adam Mickiewicz University, 60-780 Poznan, Poland article info Article history: Received 23 November 2016 Received in revised form 10 January 2017 Accepted 23 January 2017 Available online 25 January 2017 Keywords: Carbon nanotubes Langmuir-Blodgett Thin ?lm Conductivity model abstract Thin ?lms of randomly dispersed carbon nanotubes make highly promising material for transparent electrode applications. Knowing and understanding the nature of the ?lms conductivity is crucial for improvement of their electrical properties. In the paper we present our investigation of electrical conductivity of single wall and multiwalled carbon nanotube (SWCNT and MWCNT) thin ?lms deposited on a polymeric substrate by Langmuir-Schaefer technique. The conductivity of the ?lms is consistent with the Variable Range Hopping (VRH) model. Moreover, remarkable differences in SWCNT and MWCNT ?lms conductivity are observed. A signi?cant impact of the thin ?lm annealing and its temperature history on the conductivity properties is shown. The study of the carbon nanotubes layers transferred on polymeric substrate was undertaken in view of the ?lms possible applications in ?exible transparent electrodes. The VRH conductivity in carbon nanotube Langmuir-Schaefer layer is reported for the ?rst time. ? 2017 Elsevier B.V. All rights reserved. 1. Introduction The carbon nanotubes (CNTs) are fascinating materials inspiring many scientists