tag:blogger.com,1999:blog-19092890.post4675022652348555767..comments2024-03-28T17:41:43.970+02:00Comments on Image Sensors World: NoblePeak Reveals Its AchievementsVladimir Koifmanhttp://www.blogger.com/profile/01800020176563544699noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-19092890.post-67357027595213429032011-01-16T00:10:32.328+02:002011-01-16T00:10:32.328+02:00Actually, silicon would not work on top, because t...Actually, silicon would not work on top, because the thermal cycle to activate the dopants in the silicon would necessarily affect the silicon transistors in the substrate. The process flow relies on the thermal sequence silicon (high) germanium (medium) metal (low).Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19092890.post-86983585991382803392010-10-27T14:45:15.732+02:002010-10-27T14:45:15.732+02:00Cool. I have another question, too...
The fabric...Cool. I have another question, too...<br /><br />The fabrication seems somewhat analogous to amorphous silicon, only with germanium. My understanding is that amorphous silicon has low-light complications resulting from lattice defects between nanocrystals and from surface impurities, whereas crystalline silicon offers a lattice with fewer defects and the possibility of keeping the photosensitive region beneath the silicon surface.<br /><br />Presuming similar physical effects with this "amorphous germanium", the structure shown would seem to have a relatively poor sensor (except for the IR response) on top of relatively good processing circuitry.<br /><br />Would it be possible and/or useful to swap the germanium and silicon in this structure so that there's something like amorphous silicon on a crystalline germanium substrate?CDMhttps://www.blogger.com/profile/16405088162729045793noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-69995635839226103992010-10-25T12:07:07.163+02:002010-10-25T12:07:07.163+02:00CDM,
BSI allows complete charge transfer from the ...CDM,<br />BSI allows complete charge transfer from the photodetection site to the charge collection site, and then from there to the FD.<br />This complete charge transfer is the key to low noise performance. Adding any node, metallic or n+ or p+ in between causes incomplete charge transfer, noise and usually lag. It will work fine in relatively modest lighting but in low light the shiortcomings are more apparent.<br /><br />A second issue is dark current. One would have to passivate the sides of the island as well as the exposed surface in order to suppress dark current. I don't think it is likely that competitive levels would be achieved at RT.Eric R Fossumhttps://www.blogger.com/profile/09740612324630105312noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-41508059364559201792010-10-25T02:50:02.548+02:002010-10-25T02:50:02.548+02:00Just out of curiosity, would it be possible to sub...Just out of curiosity, would it be possible to substitute silicon for germanium in these processing steps? With a top-side photosensitive region FSI might continue to be competitive with BSI at smaller pixel pitch in low light. A double silicon stack on the top side might enable smaller pixel pitches in a BSI system. And, if you could do it on one side, maybe you could do it on both sides and make some tradeoffs between wire stacks and photosensing region locations (in substrate vs. on substrate, for instance).CDMhttps://www.blogger.com/profile/16405088162729045793noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-28359131286673176652010-10-23T20:29:51.122+02:002010-10-23T20:29:51.122+02:00SWIR is nominally 1000-1700 nm but gets pushed to ...SWIR is nominally 1000-1700 nm but gets pushed to 2300, 2400 or even 2500 nm for various reasons. It ends practically at 3000 nm where normal optical glasses become opaque. The part beyond 2500 nm is useful only in instruments not requiring atmospheric transmission. <br /><br />Here is a link to the venerable SBRC chart showing the common band designations - http://www.coseti.org/atmosphe.htmDave Gilblomhttp://www.alt-vision.comnoreply@blogger.comtag:blogger.com,1999:blog-19092890.post-80686208828559974732010-10-23T08:56:22.288+02:002010-10-23T08:56:22.288+02:00In IR imaging LWIR uses 8-12um atmospheric transmi...In IR imaging LWIR uses 8-12um atmospheric transmission window.<br />MWIR uses 3-5um window.<br />SWIR is shorter than that, relying on night glow phenomena. So it's correct, NoblePeak is SWIR.Vladimir Koifmanhttps://www.blogger.com/profile/01800020176563544699noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-23761149997924488132010-10-23T02:21:48.970+02:002010-10-23T02:21:48.970+02:00I think it was LWIR, not SWIR...?I think it was LWIR, not SWIR...?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19092890.post-50706421244188699572010-10-23T01:38:42.835+02:002010-10-23T01:38:42.835+02:00killer app...interesting choice of words....killer app...interesting choice of words....Eric R Fossumhttps://www.blogger.com/profile/09740612324630105312noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-7848452515489358632010-10-22T23:19:10.144+02:002010-10-22T23:19:10.144+02:00This is a great technology openning the path to ma...This is a great technology openning the path to many other non-silicon materials! I'm pretty sure and hope that these guys will come back. <br /><br />The advantage compared to hybridized FPA is obvious. The main question open is: what are the killer applications of such SWIR device?Anonymousnoreply@blogger.com