Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

Autor(en)

Yongping Liao, Kimmo Mustonen, Semir Tulić, Viera Skákalová, Sabbir A. Khan, Patrik Laiho, Qiang Zhang, Changfeng Li, Mohammad R.A. Monazam, Jani Kotakoski, Harri Lipsanen, Esko I. Kauppinen

Abstrakt

Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl3) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl3 doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down to 36 ω/.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Aalto University, University of Copenhagen

Journal

ACS Nano

Band

13

Seiten

11522-11529

Anzahl der Seiten

8

ISSN

1936-0851

DOI

https://doi.org/10.1021/acsnano.9b05049

Publikationsdatum

09-2019

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeiner Maschinenbau, Allgemeine Physik und Astronomie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/94b1282e-c76a-4bb6-8300-121f13c2b7d0