Pore Propagation Directions in P+ Porous Silicon |
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Authors: | É Vázsonyi G Battistig ZE Horváth M Fried G Kádár F Pászti JL Cantin D Vanhaeren L Stalmans J Poortmans |
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Affiliation: | (1) Research Institute for Technical Physics and Materials Science, POB 49, H-1525 Budapest, Hungary;(2) KFKI-Research Institute for Particle and Nuclear Physics, POB 49, H-1525 Budapest, Hungary;(3) GPS. University of Paris 7 and 6, Tour 23, 2. Place Jussieu-75251, Paris Cedex, 05, France;(4) IMEC, Kapeldreef 75, 3001 Leuven, Belgium |
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Abstract: | A comparative study is presented on the pore propagation directions of porous silicon layers (PSL) formed on p+-type substrates of different orientations. PSLs were formed on plain (0 0 1) and (1 1 1) silicon wafers as well as on structured (0 0 1) wafers containing facets of various orientations. During anodization, regular pores follow the 0 0 1 direction on the (0 0 1) planes. While on the (1 1 1) planes fewer regular pores develop and seemingly propagate closely to the 1 1 1 direction. These results indicate that the pores propagate perpendicular to the surface i.e. along the field lines when the surface orientation is either (0 0 1) or (1 1 1).When the silicon surface provided (1 1 0) orientation (Chuang, Collins, and Smith, 1989), or its position is in between the (0 0 1) and (1 1 1) planes then the pores do not propagate perpendicular to the surface but along the 0 0 1 direction.All the phenomena exhibited might be explained by presuming that during formation, the pores propagate along the 1 0 0 directions, and that those 1 0 0 directions are preferred which are closely to the field lines. In PSLs formed on (0 0 1) surfaces the field lines and the 0 0 1 crystallographic direction are coincident. However, in the (1 1 1) oriented wafer where three equally probable 1 0 0 directions exist around the field lines, more irregular structure of PSLs will develop. |
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Keywords: | porous silicon pore propagation orientation dependence RBS EPR |
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