NikkoIA’s technology consists in depositing thin films of photosensitive organic materials onto active or passive reading substrates. Current products are mainly based on TFT backplanes on glass, with a sensitivity optimized in the visible and/or 700/900nm spectrum range. The first evaluation cameras based on these sensors have already been shipped to the company customers.
NikkoIA announces the application of its organic imaging technology to two new product families:
- X-ray sensitive image sensors, based on 256x256, 98μm-pixels organic image sensors, coupled with a CsI scintillator optimized for 70-90keV energy;
- VGA CMOS sensors with 15μm-pixels based on organic photodiodes and CMOS pixel arrays.
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These milestones reinforce our technology potential and validate our development strategy. They represent significant achievements that can now be implemented in products dedicated to our target markets," said Alain Jutant, President of NikkoIA SAS.
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| CMOS VGA organic image sensor |
Question: what is the advantage to couple CsI with organic photodetection layer if you need still CMOS readout beneath?
ReplyDeleteThe organic photosensor is above the readout, so you can have higher fill factor.
DeleteBut with a so large pixel size, the fill factor should be very close ideal 100% (98um). So your polymer layer will increase slightly the fill factor, is this really useful??
ReplyDeleteHow is your detection material compared to a-Si:H which is tried by others??
For the 15 um pixels for the 700-900 nm, maybe MTF / cross-talk could be better.
ReplyDeleteSi-based devices need thick epilayers for sensitivity at 900 nm. There are some techniques on CMOS sensors to improve MTF, but It would be good to see MTF data on this organic technology to allow us to compare.
do you think that by binning small pixels you can get better MTF please??
Delete98μm-pixel i am assuming are using TFT backplane and not CMOS. TFT is great for large area deposition (assuming a-SI) at a very cheap price compared to CMOS technology.
ReplyDeleteAnonymous: Good fillfactor is not as important for XRAY as for visible light imaging.
ReplyDeleteGuy: Even if MTF is not dominated by the scintillator, the EPI thickness would need to be very large for it to strongly affect MTF for a 98um pixel...
Please read carefully! He talked about 15um pixel, it was said in the first sentence!!
DeleteMy comment was only related to the 15 um pixels for their VGA product with CMOS readout, not for their X-ray product.
ReplyDeleteFor that 15 um pixel, MTF and/or QE could be better than CMOS at 900 nm wavelength.
But they should publish these numbers if they want to claim any benefit of their technology.
All these companies are like InVisage. A lot of advantages claimed without any value, but only marcom language.
ReplyDelete