Day 2 was a short one.\u00a0 Only 12 presentations, which could be captured by a title such as : “new pixel architectures and single photon detection”.\u00a0 Besides the regular papers an invited one was presented about Deep Learning.<\/p>\n
A very interesting presentation was given by Francois Roy (ST Microelectronics) about a pixel architecture WITHOUT any implantation in the photodiode.\u00a0 The pixel was based on the C-DTI technology of ST in which a gate inside the deep-trench isolation is used to bias the interface of the silicon into accumulation and fully deplete the epi-layer.\u00a0 In this way a pinned photodiode is created in the 3rd dimension, for which a low dark current is expected.\u00a0 A presentation of a sensor in the same technology was already given at IEDM 2018 and seems to be present in a well-known consumer product.\u00a0 This IISW2019 paper showed a back-side illuminated version of this technology, in which the back-surface passivation is realized by “charged” dielectric layers on the back.\u00a0 Also the latter seems to be a trend in BSI CIS.\u00a0 The reported dark current of this rolling shutter imager : 5 holes\/sec at 60 degrees C for a 2 um pixel (2T5), corresponding to a dark current density of 2 pA\/cm2 (holes) at 60 degrees C, coming into the sub-pA\/cm2 at room temperature.<\/p>\n
Personally I am taken with this technology because it is a very nice combination of silicon device physics and silicon processing technology, bringing a lot of the good old CCDs back, but now in CMOS technology.\u00a0 Back to the future after 50 years !<\/p>\n
It is really funny what can be done by these DTIs.\u00a0 Yesterday a paper of Samsung showed the use of DTI to split a photodiode into two parts to allow the PDAF function within every pixel.\u00a0 The width of the a single PPD was reduced to 0.61 um.\u00a0 Today, also Samsung, introduced “dummy” DTIs in a pixel to enhance the scattering of incoming photons and to enhance the quantum efficiency of the pixels.\u00a0 A quantum efficiency of 43 % was reported for a wavelength of 940 nm.<\/p>\n
But the award for the most artistic pixel lay-out goes to Shizuoka University.\u00a0 The pixel lay-out looks like a cross-section of a aircraft engine.\u00a0 The pixel has a central photodiode surrounded by 8 taps + 8 floating diffusions in an array of 22.4 um x 22.4 um.\u00a0 The pixel is used for indirect time-of-flight applications with an inaccuracy of 7.2 mm at a distance of 6.2 m.<\/p>\n
<\/p>\n
Albert, 26\/06\/2019.<\/p>\n","protected":false},"excerpt":{"rendered":"
Day 2 was a short one.\u00a0 Only 12 presentations, which could be captured by a title such as : “new pixel architectures and single photon detection”.\u00a0 Besides the regular papers an invited one was presented about Deep Learning. A very interesting presentation was given by Francois Roy (ST Microelectronics) about a pixel architecture WITHOUT any […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1761","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1761","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1761"}],"version-history":[{"count":5,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1761\/revisions"}],"predecessor-version":[{"id":1766,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1761\/revisions\/1766"}],"wp:attachment":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}