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

Published online by Cambridge University Press:  05 February 2018

Hussain Abouelkhair
Affiliation:
Physics, University of Central Florida, Orlando FL 32789, robert.peale@ucf.edu
Pedro N. Figueiredo
Affiliation:
Physics, University of Central Florida, Orlando FL 32789, robert.peale@ucf.edu
Seth R. Calhoun
Affiliation:
Physics, University of Central Florida, Orlando FL 32789, robert.peale@ucf.edu
Chris J. Fredricksen
Affiliation:
Physics, University of Central Florida, Orlando FL 32789, robert.peale@ucf.edu
Isaiah O. Oladeji
Affiliation:
SISOM Thin Films LLC, 1209 W. Gore St. Orlando FL 32805
Evan M. Smith
Affiliation:
KBRWyle, Beavercreek OH 45431 Air Force Research Laboratory, Wright-Patterson AFB OH 45433
Justin W. Cleary
Affiliation:
Air Force Research Laboratory, Wright-Patterson AFB OH 45433
Robert E. Peale
Affiliation:
Physics, University of Central Florida, Orlando FL 32789, robert.peale@ucf.edu
Corresponding
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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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Articles
Copyright
Copyright © Materials Research Society 2018 

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