Developing the next generation of Quantum Dot X-ray sensors with unparalleled know-how
QDI systems is a high-tech start-up, spin-off from Zernike Institute for Advanced Materials, University of Groningen. At QDI systems, we develop imaging devices for medical applications based on quantum dots.Read more
Quantum dots(QDs) are tiny solution-processable semiconductor nanoparticles. This class of materials emerged a few decades ago, but only recently QDs appeared in commercial products on the mass market.Learn more
High X-ray absorption
Lead based quantum dots have one of the highest X-ray attenuation coefficients due to 85% mass fraction of lead in the conversion layer. 100 um film thickness is sufficient to absorb >95% photons used for mammography application.
Quantum dot frontpane is deposited from solution and can be manufactured using spray-coating, slot-die coating or other conventional method depending on customer needs and specifications.
Low dose X-ray imaging
Due to low impact ionization energy, absorbed X-ray photons deposit larger amount of charge in the conversion layer, compared to conventional technologies. The charges are efficiently extracted to the backplane by applying as low as 0.5 V/um electric field. Together with low leakage current, this provides high signal-to-noise ratio even at low dose rates.
Quantum dot based frontplane is truly amorphous, consisting of a few nanometer sized crystalline particles. This releases the limits of policrystalline materials where the resolution is constrained by tens of micrometer crystalline domains causing charge sharing between pixels. The resolution of Quantum dot sensors is virtually limited by the pixel size of the backplane.