Schottky diodes using as-grown single-walled carbon nanotube ensembles

We demonstrate rectifying Schottky diodes fabricated using as-grown single-walled carbon nanotubes (SWNT) ensembles, without removing the metallic SWNTs, for optoelectronic device applications. The SWNTs are contact by a low work-function metal through a high-bandgap charge-blocking layer (ZnO) resu...

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Veröffentlicht in:Applied Physics Letters 2014-03, Vol.104 (12)
Hauptverfasser: Dissanayake, D. M. N. M., Zhong, Zhaohui
Format: Artikel
Sprache:eng
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Zusammenfassung:We demonstrate rectifying Schottky diodes fabricated using as-grown single-walled carbon nanotubes (SWNT) ensembles, without removing the metallic SWNTs, for optoelectronic device applications. The SWNTs are contact by a low work-function metal through a high-bandgap charge-blocking layer (ZnO) resulting in highly-nonlinear current-voltage properties compared to control ensemble SWNT devices, fabricated without a charge-blocking layer, which show resistive behaviour. This significant improvement in diode behaviour is obtained by reducing source-drain leakage from the metallic SWNTs using the charge-blocking layer which channels charge transport via the semiconducting SWNTs. Moreover, we explore an alternative method of creating the charge barrier layer via oxidizing a thin film of Zn deposited on directly on the SWNTs which could potentially reduce cost and increasing scalability of this technique to obtain highly rectifying diodes from as-grown ensemble SWNTs.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4869551