The present invention illustrates a bulk silicon etching technique that yields straight sidewalls, through wafer structures in very short times using standard silicon wet etching techniques. The method of the present invention employs selective porous silicon formation and dissolution to create high aspect ratio structures with straight sidewalls for through wafer MEMS processing.
Bhansali, Shekhar; Abdur, Abdu Rub; and Kedia, Sunny, "Wet etching process" (2007). USF Patents. 632.
University of South Florida