Formation of porous silicon: mechanism of macropores formation in n-type si

Nurul Izni Rusli, and Mastura Shafinaz Zainal Abidin, and Budi Astuti, and Nihad K. Ali, (2013) Formation of porous silicon: mechanism of macropores formation in n-type si. Sains Malaysiana, 42 (5). pp. 643-648. ISSN 0126-6039

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Abstract

We report the formation of macropores in n-Si (100) substrates for different etching times of 20, 40 and 60 min at a constant current density of 25 mA/cm2 under front-side illumination in HF:ethanol (1:4) solution. After etching for 20 min, four-branch-shaped pores of various sizes were observed at discrete locations. Etching time of 40 min led to the formation of highly connected four-branch-shaped pores as the branches of adjacent pores appeared to connect to each other. As the etching time was increased further to 60 min, the density of interconnected branches increased remarkably. The macropore formation process occurred in three consecutive phases. The current burst model was used to discuss this process. Formation of four-branch-shaped pores at random locations were observed because current bursts are more likely to nucleate where other current bursts took place initially.

Item Type:Article
Keywords:Electrochemical etching; etching time; illumination; porous silicon
Journal:Sains Malaysiana
ID Code:6158
Deposited By: ms aida -
Deposited On:22 Apr 2013 01:55
Last Modified:14 Dec 2016 06:40

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