Patent ID: 8377792
Filing Date: 2013-02-19
Classification: H01L

Abstract:
1. A method of forming a capacitor comprising: depositing a plurality of first atoms from a first target onto a wafer to form a first metal structure on the wafer, the first atoms passing through a first shadow mask, the first shadow mask being spaced apart from a top surface of the wafer; forming a first non-conductive layer that touches and lies over the wafer and the first metal structure; depositing a plurality of second atoms from a second target onto the first non-conductive layer to form a second metal structure on the first non-conductive layer, the second atoms passing through a second shadow mask, the second shadow mask being spaced apart from a top surface of the first nonconductive layer; wherein each metal structure has a plate region and a contact region that extends away from the plate region; the plate region of the second metal structure lies over the plate region of the first metal structures; and no portion of the contact region of the second metal structure lying over the contact region of the first metal structure; forming a second non-conductive layer that touches and lies over the first non-conductive layer and the second metal structure; depositing a plurality of third atoms from the first target onto the second non-conductive layer to form a third metal structure on the second non-conductive layer, the third atoms passing through the first shadow mask, the first shadow mask being spaced apart from a top surface of the second non-conductive layer; forming a third non-conductive layer that touches and lies over the second non-conductive layer and the third metal structure; depositing a plurality of fourth atoms from the second target onto the third non-conductive layer to form a fourth metal structure on the third non-conductive layer, the fourth atoms passing through the second shadow mask, the second shadow mask being spaced apart from a top surface of the third nonconductive layer; forming a fourth non-conductive layer that touches and lies over the third non-conductive layer and the fourth metal structure; each metal structure has a plate region and a contact region that extends away from the plate region; the plate region of the fourth metal structure lies over the plate regions of the third, second, and first metal structures; the contact region of the third metal structures lies over the contact region of the first metal structure; the contact region of the fourth metal structures lies over the contact region of the second metal structure; no portion of the contact region of the third metal structure lying over the contact region of the second metal structure; no portion of the contact region of the fourth metal structure lying over the contact regions of the first and third metal structures; continue depositing alternating layers of metal and non-conductive material until a predetermined value of capacitance is reached, wherein the last layer of the alternating layers of metal and non-conductive material is comprised of non-conductive material; forming a final non-conductive layer that touches and lies over the last non-conductive layer; simultaneously forming a first opening to expose the contact region of the first metal structure, and a second opening to expose the contact region of the second metal structure; and forming a first metal contact structure in the first opening to make an electrical connection with the contact region of the first metal structure, the contact region of the third metal structure and all subsequent odd numbered metal structures, and a second metal contact structure in the second opening to make an electrical connection with the contact region of the second metal structure, the contact region of the fourth metal structure and all subsequent even numbered metal structures.