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Ternary lead-chalcogenide room-temperature mid-wave infrared detectors grown by spray-deposition

  • Hussain Abouelkhair (a1), Pedro N. Figueiredo (a1), Seth R. Calhoun (a1), Chris J. Fredricksen (a1), Isaiah O. Oladeji (a2), Evan M. Smith (a3) (a4), Justin W. Cleary (a4) and Robert E. Peale (a1)...

Abstract

Ternary lead chalcogenides, such as PbSxSe1-x, offer the possibility of room-temperature infrared detection with engineered cut-off wavelengths within the important 3-5 micron mid-wave infrared (MWIR) wavelength range. We present growth and characterization of aqueous spray-deposited thin films of PbSSe. Complexing agents in the aqueous medium suppress unwanted homogeneous reactions so that growth occurs only by the heterogeneous reaction on the hydrophilic substrate. The strongly-adherent films are smooth with a mirror-like finish. The films comprise densely packed grains with tens of nm dimensions and a total film thickness of ∼400-500 nm. Measured optical constants reveal absorption out to at least 4.5 μm wavelength and a ∼0.3 eV bandgap intermediate between those of PbS and PbSe. The semiconducting films are p-type with resistivity ∼1 and 85 Ohm-cm at 300 and 80 K, respectively. Sharp x-ray diffraction peaks identify the films as Clausthalite-Galena solid-state solution with a lattice constant that indicates an even mixture of PbS and PbSe. The photoconductive response is observed at both nitrogen and room temperature up to at least 2 kHz chopping frequency.

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Ternary lead-chalcogenide room-temperature mid-wave infrared detectors grown by spray-deposition

  • Hussain Abouelkhair (a1), Pedro N. Figueiredo (a1), Seth R. Calhoun (a1), Chris J. Fredricksen (a1), Isaiah O. Oladeji (a2), Evan M. Smith (a3) (a4), Justin W. Cleary (a4) and Robert E. Peale (a1)...

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