論文

査読有り
2019年10月

Redox-Inactive CO2 Determines Atmospheric Stability of Electrical Properties of ZnO Nanowire Devices through a Room-Temperature Surface Reaction

ACS APPLIED MATERIALS & INTERFACES
  • Kentaro Nakamura
  • ,
  • Tsunaki Takahashi
  • ,
  • Takuro Hosomi
  • ,
  • Takehito Seki
  • ,
  • Masaki Kanai
  • ,
  • Guozhu Zhang
  • ,
  • Kazuki Nagashima
  • ,
  • Naoya Shibata
  • ,
  • Takeshi Yanagida

11
43
開始ページ
40260
終了ページ
40266
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acsami.9b13231
出版者・発行元
AMER CHEMICAL SOC

Emerging interactive electronics for the Internet of Things era inherently require the long-term stability of semiconductor devices exposed to air. Nanostructured metal oxides are promising options for such atmospherically stable semiconductor devices owing to their inherent stability in air. Among various oxide nanostructures, ZnO nanowires have been the most intensively studied for electrical and optical device applications. Here, we demonstrate a strategy for achieving the atmospheric electrical stability of ZnO nanowire devices. Although the chemically active oxygen and water in air are strong candidates for affecting the electrical stability of nanoscale metal oxides, we found that the ppm-level redox-inactive CO2 in air critically determines the atmospheric electrical stability of hydrothermally grown single-crystalline ZnO nanowires. A series of analyses using atmosphere-controlled electrical characterization of single nanowire devices, Fourier transform infrared spectroscopy, scanning transmission electron microscopy, and X-ray photoelectron spectroscopy consistently revealed that atmospheric CO2 reacts substantially with the ZnO nanowire surfaces, even at room temperature, to form an electrically insulative zinc carbonate thin layer. The formation of this layer essentially limits the atmospheric electrical stability of the ZnO nanowire devices. Based on this surface carbonation mechanism, we propose a strategy to suppress the detrimental surface reaction, which is based on (1) reducing the density of surface hydroxyl groups and (2) improving the nanowire crystallinity by thermal pretreatment. This approach improves the atmospheric electrical stability to at least 40 days in air.

Web of Science ® 被引用回数 : 2

リンク情報
DOI
https://doi.org/10.1021/acsami.9b13231
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000493869700086&DestApp=WOS_CPL

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