COMPLEMENTARY METAL OXIDE SEMICONDUCTOR (CMOS) ULTRASONIC TRANSDUCERS AND METHODS FOR FORMING THE SAME
First Claim
Patent Images
1. An apparatus, comprising:
- a semiconductor wafer having a complementary metal oxide semiconductor (CMOS) integrated circuit;
a conductive membrane bonded with the semiconductor wafer to form a bonded structure such that a sealed cavity exists between a bonding surface of the semiconductor wafer and a first side of the conductive membrane, the conductive membrane having a second side distal from the bonding surface of the semiconductor wafer; and
a conductive standoff on the first side of the conductive membrane proximate the bonding surface of the semiconductor wafer such that a surface of the conductive standoff forms an interface between the first side of the conductive membrane and the bonding surface, wherein the conductive standoff connects the conductive membrane to the CMOS integrated circuit, andwherein the bonded structure lacks an electrode that is on the second side of the conductive membrane and that overlies the cavity.
2 Assignments
0 Petitions
Accused Products
Abstract
Complementary metal oxide semiconductor (CMOS) ultrasonic transducers (CUTs) and methods for forming CUTs are described. The CUTs may include monolithically integrated ultrasonic transducers and integrated circuits for operating in connection with the transducers. The CUTs may be used in ultrasound devices such as ultrasound imaging devices and/or high intensity focused ultrasound (HIFU) devices.
31 Citations
18 Claims
-
1. An apparatus, comprising:
-
a semiconductor wafer having a complementary metal oxide semiconductor (CMOS) integrated circuit; a conductive membrane bonded with the semiconductor wafer to form a bonded structure such that a sealed cavity exists between a bonding surface of the semiconductor wafer and a first side of the conductive membrane, the conductive membrane having a second side distal from the bonding surface of the semiconductor wafer; and a conductive standoff on the first side of the conductive membrane proximate the bonding surface of the semiconductor wafer such that a surface of the conductive standoff forms an interface between the first side of the conductive membrane and the bonding surface, wherein the conductive standoff connects the conductive membrane to the CMOS integrated circuit, and wherein the bonded structure lacks an electrode that is on the second side of the conductive membrane and that overlies the cavity. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method, comprising:
-
bonding a transfer wafer to a semiconductor wafer to form a bonded structure with a sealed cavity, the semiconductor wafer having a complementary metal oxide semiconductor (CMOS) integrated circuit; and removing at least a portion of the transfer wafer to define a conductive membrane from a remaining portion of the transfer wafer, wherein the sealed cavity is between a bonding surface of the semiconductor wafer and a first side of the conductive membrane, the conductive membrane having a second side distal from the bonding surface of the semiconductor wafer; wherein a conductive standoff is disposed on the first side of the conductive membrane proximate the bonding surface of the semiconductor wafer such that a surface of the conductive standoff forms an interface between the first side of the conductive membrane and the bonding surface, wherein the conductive standoff connects the conductive membrane to the CMOS integrated circuit; and wherein the bonded structure lacks an electrode that is on the second side of the conductive membrane and that overlies the cavity. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A method, comprising:
-
forming a complementary metal oxide semiconductor (CMOS) integrated circuit on a semiconductor wafer; forming a conductive standoff on the semiconductor wafer; bonding a transfer wafer having at least one conductive layer to the conductive standoff of the semiconductor wafer, and removing a least a portion of the transfer wafer to form; a bonded structure having a conductive membrane defined at least in part by the at least one conductive layer; and a sealed cavity between a bonding surface of the semiconductor wafer and a first side of the conductive membrane, the conductive membrane having a second side distal from the bonding surface of the semiconductor wafer; wherein the conductive standoff is on the first side of the conductive membrane and wherein a surface of the conductive standoff forms an interface between the first side of the conductive membrane and the bonding surface, wherein the conductive standoff connects the conductive membrane to the CMOS integrated circuit; and wherein the bonded structure lacks an electrode that is on the second side of the conductive membrane and that overlies the cavity. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification