Ultrahigh-performance transparent conductive films of carbon-welded isolated single-wall carbon nanotubes

Song Jiang, Peng Xiang Hou, Mao Lin Chen, Bing Wei Wang, Dong Ming Sun, Dai Ming Tang, Qun Jin, Qing Xun Guo, Ding Dong Zhang, Jin Hong Du, Kai Ping Tai, Jun Tan, Esko I. Kauppinen, Chang Liu, Hui Ming Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

202 Citations (Scopus)
244 Downloads (Pure)

Abstract

Single-wall carbon nanotubes (SWCNTs) are ideal for fabricating transparent conductive films because of their small diameter, good optical and electrical properties, and excellent flexibility. However, a high intertube Schottky junction resistance, together with the existence of aggregated bundles of SWCNTs, leads to a degraded optoelectronic performance of the films. We report a network of isolated SWCNTs prepared by an injection floating catalyst chemical vapor deposition method, in which crossed SWCNTs are welded together by graphitic carbon. Pristine SWCNT films show a record low sheet resistance of 41 ohm -1 at 90% transmittance for 550-nm light. After HNO3 treatment, the sheet resistance further decreases to 25 ohm -1. Organic light-emitting diodes using this SWCNT film as anodes demonstrate a low turn-on voltage of 2.5 V, a high current efficiency of 75 cd A-1, and excellent flexibility. Investigation of isolated SWCNT-based field-effect transistors shows that the carbon-welded joints convert the Schottky contacts between metallic and semiconducting SWCNTs into near-ohmic ones, which significantly improves the conductivity of the transparent SWCNT network. Ourwork provides a new avenue of assembling individual SWCNTs into macroscopic thin films, which demonstrate great potential for use as transparent electrodes in various flexible electronics.

Original languageEnglish
Article numbereaap9264
Pages (from-to)1-10
JournalScience Advances
Volume4
Issue number5
DOIs
Publication statusPublished - 4 May 2018
MoE publication typeA1 Journal article-refereed

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