Patent ID: 6576529
Filing Date: 2003-06-10
Classification: H01J,H01L,Y10S

Abstract:
A method of forming a multi-layered semiconductor structure having a semiconductor substrate, said method comprising the steps of:(a) forming an alignment feature in the semiconductor substrate by; forming a shallow trench in the semiconductor substrate; depositing silicon dioxide in the shallow trench; forming a shallow trench in the silicon dioxide by removing part of the silicon dioxide deposited in the shallow trench; and depositing a material in the shallow trench formed in the silicon dioxide, said material having a different high atomic number than the atomic number of the semiconductor substrate; and (b) aligning a lithography mask using the alignment feature formed in said step (a) using an electron beam source for directing an electron beam toward the semiconductor substrate, wherein the alignment feature, when an electron beam is incident on the semiconductor substrate with the alignment feature formed therein, back-scatters a greater amount of electrons toward the electron beam source than the semiconductor substrate.