کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
195760 | 459821 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fast speed pore formation via strong oxidizers Fast speed pore formation via strong oxidizers](/preview/png/195760.png)
It is difficult to produce nice macropores at high speed with strong oxidants via the breakdown mechanism on low doped n-Si. In this letter, HF-containing electrolytes were modified with strong oxidants; galvanostatically anodizing in the dark, macropores with depths upto 80 μm and pore-diameters between 100 and 1000 nm were fast produced on low doped substrate. Two new phenomena were observed: pore tips could be tumefied simultaneously and macropores could be filled with a uniform microporous layer under dark conditions. Mild short-range ordering of pores was observed. The macropores are rather nice while the etching rate could reach the highest of its kind, 1800 μm/h. The underlying mechanism was in the framework of the current-burst-model combined with avalanche breakdown; both pore pitch and pore-wall thickness could be significantly less than SCR (space charge region) width.
Journal: Electrochimica Acta - Volume 52, Issue 24, 1 August 2007, Pages 6728–6733