Damage-free top-down processes for fabricating two-dimensional arrays of 7 nm GaAs nanodiscs using bio-templates and neutral beam etching

Damage-free top-down processes for fabricating two-dimensional arrays of 7 nm GaAs nanodiscs using bio-templates and neutral beam etching
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使用生物模板和中性束蚀刻制造 7 nm GaAs 纳米盘二维阵列的无损伤自上而下工艺

DOI:
10.1088/0957-4484/22/36/365301
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发表时间:
2011
期刊:
影响因子:
3.5
通讯作者:
S. Samukawa
S. Samukawa
中科院分区:
材料科学3区
文献类型:
--
作者:
Xuan;Chi;R. Tsukamoto;P. Mortemousque;K. Itoh;Y. Ohno;S. Samukawa

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通过使用铁蛋白(一种包括7 nm直径铁核的蛋白质)生物模板和中性束蚀刻,开发了用于7 nm GaAs纳米盘的二维阵列的第一个无损伤自上而下的制造工艺。中性束刻蚀GaAs的光致发光表明,该工艺可以实现GaAs的无缺陷刻蚀。在生物模板工艺中,为了去除铁蛋白蛋白质外壳而不对GaAs造成热损伤,我们首先开发了280 °C低温氧自由基处理方法。然后,使用铁芯作为蚀刻掩模,中性束蚀刻GaAs的无缺陷纳米盘结构。结果,成功地制造了直径为1.7 nm,高度为1.10 nm,高锥角为88°,量子点密度超过7 × 1011 cm − 2的GaAs量子点二维阵列,而不会对GaAs造成任何损伤。
The first damage-free top-down fabrication processes for a two-dimensional array of 7 nm GaAs nanodiscs was developed by using ferritin (a protein which includes a 7 nm diameter iron core) bio-templates and neutral beam etching. The photoluminescence of GaAs etched with a neutral beam clearly revealed that the processes could accomplish defect-free etching for GaAs. In the bio-template process, to remove the ferritin protein shell without thermal damage to the GaAs, we firstly developed an oxygen-radical treatment method with a low temperature of 280 °C. Then, the neutral beam etched the defect-free nanodisc structure of the GaAs using the iron core as an etching mask. As a result, a two-dimensional array of GaAs quantum dots with a diameter of ∼ 7 nm, a height of ∼ 10 nm, a high taper angle of 88° and a quantum dot density of more than 7 × 1011 cm − 2 was successfully fabricated without causing any damage to the GaAs.
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