Imec PbS QD Photodiodes for CMOS Integration
"Colloidal quantum dots based on lead sulfide are very attractive materials for the realization of novel infrared image sensors combining low cost synthesis and processing, deposition over large area and on any substrate. This work describes the building blocks that will enable the integration of QD photodiodes on top of a CMOS ROIC. Photodetectors with high detectivity and low dark current are demonstrated. Furthermore, photolithographic patterning of the thin-film stack is introduced for the first time, showing the feasibility of high pixel pitch, opening the way towards high resolution monolithic infrared imagers."