The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2001
Filed:
May. 05, 1999
Applicant:
Inventor:
Yoichiro Nishimoto, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/100 ;
U.S. Cl.
CPC ...
H01L 2/100 ;
Abstract
The present invention provides a method for producing a solar cell comprising the step of immersing a silicon substrate in an etching solution which includes an aqueous sodium carbonate (Na,CO,) solution, optionally an aqueous sodium hydroxide (NaOH) solution and/or an aqueous sodium bicarbonate (NaHCO,) solution to form minute concave and convex patterns on the surface of the silicon substrate. This method allows quite uniform textures to be formed on the crystal faces while avoiding the problem of disposal of isopropyl.