tag:blogger.com,1999:blog-19092890.post2374898397972805524..comments2024-03-28T17:41:43.970+02:00Comments on Image Sensors World: Organic Photodiodes ImprovingVladimir Koifmanhttp://www.blogger.com/profile/01800020176563544699noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-19092890.post-18408474206383813892009-07-02T16:27:32.541+03:002009-07-02T16:27:32.541+03:00Thank you for the info. 65nA/cm2 is not that bad a...Thank you for the info. 65nA/cm2 is not that bad already. It translates to less than 1000e/s for 1.4um pixel, which is not that far away already. I wonder at what temperature this was measured?Vladimir Koifmanhttps://www.blogger.com/profile/01800020176563544699noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-9401606197337781402009-07-02T08:47:09.168+03:002009-07-02T08:47:09.168+03:00From the nano letters paper:
"[...] Here, we ...From the nano letters paper:<br />"[...] Here, we report fully spray-coated OPDs<br />with reproducible low dark current densities of ~ 65 nA/cm2 with EQEs as high as 76% at -5 V reverse bias."<br /><br />"[...] Continuous HC films are obtained with a layer thickness as thin as ~100 nm. The root mean square (rms) roughness value for a single spray-coated HC layer with an average thickness of ~220 nm is ~33 nm"<br />HC being the "Hole Conductor" layer.<br /><br />"[...] the 25-75 percentile range of the dark current from 6.2 × 10-5 to 7.9 × 10-5 mA/cm2 and photocurrents from 0.232 to 0.237 mA/cm2. [...] Furthermore, transient measurements of spray-coated OPDs with an active area of 1 mm2 exhibit a -3 dB cutoff frequency at 100 kHz."<br /><br />They mention at the end of the paper that position-sensitive detectors using this technology will be reported "elsewhere".<br />I will see if I can find it.Davidhttps://www.blogger.com/profile/05373349426893947212noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-52033872541749885922009-07-01T19:13:34.778+03:002009-07-01T19:13:34.778+03:00David,
Thank you for the interesting links! If yo...David,<br /><br />Thank you for the interesting links! If you happen to have access to these publications, what is their dark current and image lag? Also, do they tell something about reproducibility of their spray-based technology?Vladimir Koifmanhttps://www.blogger.com/profile/01800020176563544699noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-80877688598783899372009-07-01T18:07:10.529+03:002009-07-01T18:07:10.529+03:00Lag? Dark current?Lag? Dark current?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19092890.post-54035915730899604802009-07-01T17:53:10.821+03:002009-07-01T17:53:10.821+03:00I guess this announcement is related to their pape...I guess this announcement is related to their paper at Nano letters from march:<br />http://pubs.acs.org/doi/abs/10.1021/nl803386y<br /><br />In case the link is not visible without subscription, the abstract reads:<br />"Solution-processed organic diodes based on bulk heterojunctions are attractive for large area photodetection. We report a general approach for fully spray-coated organic photodiodes with outstanding characteristics in comparison to bladed or spin-coated devices. Despite the high surface roughness and the less defined morphology of the spray-deposited organic layers, we observe organic photodetectors with responsivities of 0.36 A/W and noise equivalent powers of 0.2 pW/H^(1/2) in the visible spectrum at high reverse biases of −5 V. Furthermore, we demonstrate device lifetimes beyond 1 year as well as superior yield and reproducibilties for the dark current and photocurrent densities."<br /><br />They seem to be doing nice things with organic photodiodes:<br />http://w1.siemens.com/innovation/en/news_events/ct_pressreleases/e_research_news/2009/e_22_resnews_0911_1.htm<br />(paper in nature photonics: http://www.nature.com/nphoton/journal/v3/n6/abs/nphoton.2009.72.html)Davidhttps://www.blogger.com/profile/05373349426893947212noreply@blogger.com