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Wafer-scale patterning of sub-40 nm diameter and high aspect ratio (> 50 : 1) silicon pillar arrays by nanoimprint and etching

机译:通过纳米压印和蚀刻,对直径小于40 nm的晶圆尺寸图形和高纵横比(> 50:1)的硅柱阵列

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摘要

We demonstrate wide-area fabrication of sub-40 nm diameter, 1.5 mu m tall, high aspect ratio silicon pillar arrays with straight sidewalls by combining nanoimprint lithography (NIL) and deEP 3reactive ion etching (DRIE). Imprint molds were used to pre-pattern nanopillar positions precisely on a 200 nm square lattice with long range order. The conventional DRIE etching process was modified and optimized with reduced cycle times and gas flows to achieve vertical sidewalls; with such techniques the pillar sidewall roughness can be reduced below 8 nm (peak-to-peak). In some cases, sub-50 nm diameter pillars, 3 mu m tall, were fabricated to achieve aspect ratios greater than 60: 1.
机译:通过结合纳米压印光刻(NIL)和deEP 3反应离子刻蚀(DRIE),我们证明了直径小于40 nm,高1.5μm,高深宽比且具有直侧壁的硅柱阵列的广域制造。压印模具用于在长距离有序的200 nm方格上精确地预先图案化纳米柱位置。对传统的DRIE蚀刻工艺进行了修改和优化,以减少循环时间和气流以实现垂直侧壁。利用这种技术,可以将柱侧壁的粗糙度降低到8 nm以下(峰对峰)。在某些情况下,制造了3毫米高的直径小于50 nm的柱子,以实现大于60:1的长宽比。

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