Experimental study demonstrates a near-3 megapixel colloidal quantum dot infrared array, indicating a viable route toward low-cost high-resolution thermal imaging.
Key Points
To develop a high-resolution, small-pixel-pitch mid-wave infrared focal plane array using solution-processed HgTe colloidal quantum dots to overcome traditional epitaxial fabrication limits.
Fabricated an exciton extraction-enhanced barrier-type HgTe colloidal quantum dot focal plane array with a 1920×1536 resolution and 5 μm pixel pitch.
Characterized device performance including cutoff wavelength, dark current density, and blackbody detectivity across temperatures from 120 K to 200 K.
Performed mid-wave infrared thermal imaging demonstrations at an operating temperature of 120 K.
Achieved a cutoff wavelength of approximately 4 μm and a peak blackbody detectivity of 1 × 10^9 Jones at zero bias and 150 K.
Maintained a low dark current density between 10^-7 and 10^-6 A/cm² across the 120–200 K operating temperature range.
Successfully demonstrated thermal imaging of objects at varying temperatures at a 120 K device operating temperature.