Patent ID: 11906946
Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H  B | IPC G

Claim 0:
1. A method for controlling directionality of fast-wet-etching of crystalline silicon, c-Si, the method comprising:
anisotropically wet-etching the c-Si along a first crystallographic plane of the c-Si using an etching solution that wet-etches the c-Si along the crystallographic plane at a faster rate than the c-Si along a second crystallographic plane of the c-Si, wherein the etching solution comprises potassium hydroxide (KOH) and the etching byproducts from the wet-etched c-Si comprises orthosilicic acid, Si(OH)4, and wherein the KOH solution comprises concentration levels <10% (w/v), and is maintained at a temperature range between 20° C.-30° C.; and
increasing the rate of removal of etching byproducts from the second crystallographic plane of the wet-etched c-Si to cause the wet-etching of the c-Si along the second crystallographic plane to be at a faster rate than the wet-etching of the c-Si along the first crystallographic plane of the c-Si.