期刊
SCIENCE ADVANCES
卷 4, 期 5, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aap9264
关键词
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资金
- Ministry of Science and Technology of China [2016YFA0200101]
- National Natural Science Foundation of China [51625203, 51532008, 51521091, 51772303, 51572264, 51390473, 51371178, 51372254]
- Chinese Academy of Sciences [KGZD-EW-T06]
- CAS/SAFEA (Chinese Academy of Sciences/State Administration of Foreign Experts Affairs) International Partnership Program for Creative Research Teams
- Molecular and Thin Film Engineering for Building Integrated Photonics and Process Industry project of the Aalto University Aalto Energy Efficiency Research Programme
- Liaoning BaiQianWan Talents Program
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 rectangle(-1) at 90% transmittance for 550-nm light. After HNO3 treatment, the sheet resistance further decreases to 25 ohm rectangle(-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. Our work 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.
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