Express determination of thickness and dielectric function of single-walled carbon nanotube films

Georgy A. Ermolaev, Alexey P. Tsapenko, Valentyn S. Volkov, Anton S. Anisimov, Yury G. Gladush, Albert G. Nasibulin*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
118 Downloads (Pure)

Abstract

Single-walled carbon nanotube (SWCNT) films are promising building blocks for diversified applications in electronics, photovoltaics, and photonics. However, their electrical and optical engineering is still a challenging task owing to multiple obstacles, including the absence of fast and easy-to-use methods for the determination of SWCNT film properties. Here, we present a rapid, contactless, and universal technique for accurate estimation of both SWCNT film thicknesses and their dielectric functions. The approach combines broadband optical absorbance and highly sensitive spectroscopic ellipsometry measurements. The observed linear dependence of the film thickness on its absorbance at 550nm provides a time-effective and contactless method of thickness assignment, which is of significant importance to the practical implementation of SWCNT films in optoelectronic devices. Additionally, our approach revealed that a simple procedure of film densification allows to controllably alter the dielectric response by at least 40% and, thus, to add extra fine-tuning capabilities during material property engineering. Therefore, this express technique as a whole offers an advanced metrological tool for current and next-generation SWCNT-based devices.

Original languageEnglish
Article number231103
Number of pages5
JournalApplied Physics Letters
Volume116
Issue number23
DOIs
Publication statusPublished - 8 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • THIN-FILMS
  • OPTICAL ANISOTROPY
  • TRANSPARENT
  • FABRICATION
  • ELECTRODES
  • GRAPHENE

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