First SWIR sensor with non-lead quantum dots
The Q-COMIRSE project in Belgium has shown a prototype shortwave infrared (SWIR) sensor with indium arsenide (InAs) rather than lead for the quantum dot photodiodes, the first of its kind.
The 1390nm sensor is an environmentally friendly alternative to first-generation quantum dots that contain lead, which limited widespread manufacturing.
SWIR sensors can provide enhanced contrast and detail and are often used alongside optical sensors. While current versions are costly and limited to high-end applications, wafer-level integration of InAs quantum dots into a CMOS process promises broader accessibility.
The partners in the project have shown the sensor on both glass and silicon substrates and used a particular selection of stack materials that resulted in over 300 hours of stability, enabling fab manufacturing compatibility. The pixel architecture can readily be integrated with CMOS technology for image sensing applications, but also allows flat panel display integration.
The partners include R&D lab imec, Ghent University, QustomDot BV, ChemStream BV and ams OSRAM.
“The first generation of QD sensors was crucial for showcasing the possibilities of this
flexible platform. We are now working towards a second generation that will serve as a crucial enabler for the masses – aiming at cost-efficient manufacturing in an environmentally friendly way. With major industry players looking into quantum dots, we are committed to further refine this semiconductor technology towards accessible, compact, multifunctional image sensors with new functionalities,” said Pawel Malinowski, technology manager and domain lead imaging at imec.
“Replacing lead in colloidal quantum dots with a more environmentally friendly material was our key goal in Q-COMIRSE. This paves the way toward a low-cost and Pb-free short-wave-infrared technology that, once mature for industrial products, could enable unprecedented applications in robotics, automotive, AR/VR and consumer electronics among others,” said Stefano Guerrieri, Engineering Fellow at ams OSRAM.
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