Patent ID: 7517716
Filing Date: 2009-04-14
Classification: H01L,Y02E,Y02P

Abstract:
1. A semiconductor fabrication method, comprising: providing a structure which comprises a semiconductor substrate; forming a first electrode and a fourth electrode at a first depth in the semiconductor substrate; after said forming the first and fourth electrodes is performed, forming a second electrode and a fifth electrode at a second depth in the semiconductor substrate; and after said forming the second and fifth electrodes is performed, forming a third electrode and a sixth electrode at a third depth in the semiconductor substrate, wherein the first depth is greater than the second depth, wherein the second depth is greater than the third depth, wherein a first semiconducting region of the semiconductor substrate is disposed between and in direct physical contact with the first and fourth electrodes, wherein a second semiconducting region of the semiconductor substrate is disposed between and in direct physical contact with the second and fifth electrodes, wherein a third semiconducting region of the semiconductor substrate is disposed between and in direct physical contact with the third and sixth electrodes, and wherein the first, second, and third semi-conducting regions are in direct physical contact with each other.