Room temperature operated HgCdTe colloidal quantum dot infrared focal plane array using shockwave dispersion technique

Abstract

This paper reports development and performance evaluation of room temperature operated Mercury Cadmium Telluride (HgCdTe) colloidal quantum dot (CQD) coated Si Readout Integrated Circuit (ROIC) based Infrared (IR) Focal Plane Array (FPA). HgCdTe CQD has been synthesized through bottom up chemical approach and coated over commercially off-the-shelf (COTS) Si ROIC die using indigenously developed Shock Wave Dispersion Technique to achieve better uniformity, thickness control and adhesion to Si ROIC compared to spin coating or drop casting, better absorption of photons which resulted in improved imaging performance. Images of various IR and visible targets have been captured and performance analysis has been carried out and detectivity of 4.8 × 107 Jones achieved at room temperature for IRFPA fabricated by new material deposition technique. Temperature dependent photo-response variation of the IR FPA also has been evaluated to determine optimum operating temperature.

Keywords

• CQD
• FPA
• MWIR
• D*
• ROIC