Development of the HgCdSe Alloy System for Infrared Sensor Applications.

Whitsett, Charles R.; Summers, Christopher J.; Broerman, J. G.; Nelson, Donald A.

doi:10.21236/ada041534

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Although the IR capability of HgCdSe has been known for some time 20, there is very little work published in open literature. In fact, only one group has ever grown HgCdSe by MBE and that work was done almost 20 years ago 21.…”

Section: Development Of Hgcdsementioning

confidence: 99%

Hg based II–VI compounds on non‐standard substrates

Brill

Chen

Wijewarnasuriya

et al. 2012

Physica Status Solidi (a)

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The Army Research Laboratory (ARL) is pursuing scalable infrared (IR) material technologies to meet the growing need for large format arrays. A two pronged approach is being undertaken at ARL using II-VI semiconductor materials. The first encompasses the well developed IR material system HgCdTe but grown on large area, extremely lattice mismatched Si (112) substrates. To overcome the high dislocation density associated with the large mismatch within the as-grown material, ARL has successfully pursued a postgrowth thermal cycle annealing (TCA) process to reduce the dislocation density by an order of magnitude. Current results show HgCdTe/Si material can consistently be achieved with dislocation density values on the order of 1 Â 10 6 cm À2 . The second approach involves developing HgCdSe material using lattice matched, large area, and commercially available III-V substrates, specifically GaSb. Preliminary results indicate that quality HgCdSe growth by molecular beam epitaxy (MBE) can be achieved and that the bandgap of the material can be controlled through the Cd/Se ratio of fluxes used during growth.

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Section: Development Of Hgcdsementioning

confidence: 99%

Hg based II–VI compounds on non‐standard substrates

Brill

Chen

Wijewarnasuriya

et al. 2012

Physica Status Solidi (a)

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“…In 1977, W.H. Whitsett recorded three prehistoric sites (41SM94, 41SM95, and 41SM96) during a survey for the Texas Water Quality Board and the City of Tyler (Whitsett 1977). Of the three, only 41SM94, a multicomponent site, was found to contain Caddo pottery.…”

Section: Previous Investigationsmentioning

confidence: 99%

National Register of Historic Places Eligibility Testing of Site 41SM385 Within TxDOT's Tyler District, Smith County, Texas

Nash¹,

Ellis²,

Wallace³

et al. 2011

ITA

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PBS&J, an Atkins company, was contracted by the North East Texas Regional Mobility Authority to conduct National Register of Historic Places eligibility testing of site 41SM385, a prehistoric campsite on a small rise above the floodplain of Indian Creek in western Smith County, Texas. Testing investigations were conducted during March and September 2009. The site was subjected to a systematic program of shovel testing, mechanical trenching, and hand excavation in an effort to identify cultural features or living surfaces and optimize recovery of diagnostic faunal, floral, and artifactual remains. The recovered cultural artifacts indicate that site 41SM385 represents a probable Woodland and Caddo-aged occupation on a small rise on the creek floodplain. The Woodland component is based on recovered small Gary and Kent projectile points characteristic of Woodland culture of the region. The Caddo component is based on ceramic sherds of probable Early or Middle Caddo origin identified at the site. Radiocarbon dating of four ceramic sherds supports these assessments with three sherds dating to the Early to Middle Caddo periods and one sherd dating to the Woodland period. The lack of identified cultural features suggests that the Woodland component probably represents a series of ephemeral usages of the location, probably as short-term campsites. The Caddo-aged artifacts at the site probably represent a series of ephemeral usage of the location, either as a resource procurement locus ancillary to nearby site 41SM404 or as a short-term campsite. The testing program failed to locate living surfaces or cultural features containing in situ artifactual or organic remains preserved on the site. The absence of cultural features and the paucity of lithic tools or ceramic remains make more-meaningful functional interpretation infeasible. For this reason, the site lacks the data resources that would warrant National Register of Historic Places isting or designation as a State Archeological Landmark. No further work is recommended. l

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