Method Of Forming Pores In Crystal Substrate, And Crystal Substrate Containing Pores Formed By the same
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Abstract
A crystalline substrate 1 having straight or spiral deep pores is obtained in cost effective manner. A method for forming pores comprises the steps of preparing the monocrystalline substrate 1 of which (100) surface is processed to be perpendicular to the depth direction of pores to be formed, and an etchant containing 10.0% by weight or less hydrofluoric acid; and chemically etching the substrate surface with metallic particles 2 such as silver, platinum and palladium electroless-plated on it.
26 Citations
23 Claims
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1-11. -11. (canceled)
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12. A method for forming pores on a substrate, the method comprising the steps of:
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providing a monocrystalline substrate with a (100) or (111) plane perpendicular to the depth direction of pores to be formed;
loading one or more types of metallic particles selected from silver, platinum and palladium on a surface of the substrate; and
chemically etching the surface. - View Dependent Claims (13, 14, 15, 16)
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17. A monocrystalline substrate comprising:
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pores formed in a <
100>
direction or in a direction of about 35 degrees of tilt angle against a surface of the substrate; and
one or more types of metallic particles selected from silver, platinum and palladium existing at the bottom of pores, the ratio of the pore diameter to the particle diameter being 1 to 2. - View Dependent Claims (18, 19)
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20. A method for forming pores on a substrate, the method comprising the steps of:
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providing a mono- or multi-crystalline substrate;
loading one or more types of metallic particles selected from silver, platinum and palladium on a surface of the substrate; and
chemically etching the surface in a liquid mixture containing 28.0% by weight or more of hydrofluoric acid and hydrogen peroxide. - View Dependent Claims (21)
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22. A mono- or multi-crystalline substrate comprising:
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spiral pores with a pore diameter of 10 to 200 nm and a spiral diameter of 100 to 600 nm; and
one or more types of metallic particles selected from silver, platinum and palladium existing at the bottom of pores. - View Dependent Claims (23)
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Specification