Abstract
The influence of geometry of a carbon nanotube (CNT) pillar array on its field‐emission (FE) properties was investigated for the purpose of designing a high‐efficiency CNT field‐emitter array. The dependence of the FE properties (turn‐on voltage and emission site distribution) on the pillar pitch and shape was examined. The examination of the FE properties using a square‐shaped pillar array showed that the pillar pitch is not a dominant factor to lower the turn‐on voltage and improve the uniformity of emission sites. On the other hand, the change of the pillar shape from a square to a ‘mountain shape’ improved the FE properties. This improvement is due to the dispersed growth morphology, which reduces the field‐screening effect at the top of the mountain‐shaped pillars. This result indicates that controlling the pillar shape is effective for improving the FE properties of the CNT pillar array. Copyright © 2011 John Wiley & Sons, Ltd.
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