Patent ID: 6458619
Filing Date: 2002-10-01
Classification: H01L,Y02E

Abstract:
A method for fabricating a PIN photodiode, the method comprising the steps of:providing a first semiconductor substrate lightly doped with a first dopant type, the first semiconductor substrate having first and second planar surfaces; diffusing the first planar surface of the first semiconductor substrate with the first dopant type to form a first active region; forming a first oxide layer on the first planar surface of the first semiconductor substrate; forming a first glass layer on a first planar surface of a second semiconductor substrate; bonding the first planar surface of the second semiconductor substrate to the first planar surface of the first semiconductor substrate; lapping the second planar surface of the first semiconductor substrate; selectively masking and diffusing a predetermined portion of the second planar surface of the first semiconductor substrate with a second dopant type to form a second active region; forming a second oxide layer on the second planar surface of the first semiconductor substrate; selectively masking and etching the second oxide layer to form a first contact hole in the second oxide layer and an etching opening in the second oxide layer; selectively etching the etching opening in the second oxide layer down to the first oxide layer to form an isolation trench; and forming a first contact in the first contact hole.