RESEARCH TRIANGLE PARK, N.C. – Nov. 2, 2011 – Ziptronix Inc., the leading developer of direct bonding technology for advanced semiconductor applications, announced today that recent collaborations with major image-sensor manufacturers have shown that the Ziptronix ZiBondTM direct bonding process contributes minimum distortion in backside illuminated (BSI) image sensors.
“In addition to confirming that the Ziptronix direct bonding technology delivers the lowest distortion of any process for manufacturing BSI image sensors, these results have tremendous bottom-line significance for image sensor makers,” said Ziptronix CEO Dan Donabedian. “Minimal distortion means pixels can be scaled smaller, and that means increased image sensor resolution, more die per wafer, improved image sensor yields and lower production costs.”
BSI image sensors are rapidly replacing frontside illuminated image sensors for applications such as digital cameras and smartphone cameras due to pixel scaling and other advantages enabled by not illuminating the photodiodes through the CMOS interconnect stack. BSI image sensor manufacturing typically requires bonding a silicon CMOS wafer to a non-CMOS handle wafer. Because this bonding technology does not involve a large coefficient of thermal expansion (CTE) mismatch, it does enable very low distortion which is required for scalable color filter array overlay on the exposed photodiodes after thinning of the bonded CMOS wafer.
Distortion of the wafer introduced during the bonding process can compromise the overlay and limit pixel scaling. ZiBond’s inherent capacity for high bond strength at low temperature effectively minimizes this distortion compared to the competing bond technologies, adhesive and copper thermo-compression. This directly enables submicron pixel scaling; for example, 0.9 micron pixel BSI image sensors have already been fabricated and work on 0.7 micron pixel BSI is underway.
Sony Corp., a leader in image sensor manufacturing, has recently licensed the Ziptronix ZiBond technology for BSI image sensor manufacturing. Several sources, including a Chipworks teardown published by technology blog network Engadget, have subsequently reported that Sony is supplying image sensors for the iPhone 4S.
About Ziptronix
Ziptronix is a pioneer in the development of low-temperature direct bond technology for a variety of semiconductor applications, including backside-illuminated (BSI) sensors, RF front-ends, pico projectors, memories and 3D integrated circuits. Its patented, scalable 3D-integration technology, including ZiBondTM and DBI®, provides the lowest-cost bonding solution for 3D technology, while enabling size reduction, yield enhancement, lower production costs and power consumption, and increased system performance. The company holds more than 35 U.S. patents and more than 20 international patents in nine foreign countries and Europe. It has more than 45 U.S. and international patent applications pending. Ziptronix licenses its technology throughout the semiconductor supply chain, including OEMs, IDMs and some fabrication and assembly facilities, and operates a back-end-of-line R&D facility with 6,000 square feet (557m2) of Class 100/1000 cleanroom space at its headquarters in Research Triangle Park, N.C. Ziptronix was founded in 2000 as a venture-backed spinoff of RTI International. Visit www.ziptronix.com
