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Long-wavelength infrared focal plane arrays fabricated from HgCdTe grown on silicon substrates
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Andresen, Bjorn F., Hall, David J., Fulop, Gabor F., Buckle, Louise, Gordon, Neil T., Giess, Jean, Hails, Janet E., Cairns, John W., Lawrence, Rebecca M., Graham, Andrew, Hall, Ralph, Maltby, Corinne and Ashley, Tim (2004) Long-wavelength infrared focal plane arrays fabricated from HgCdTe grown on silicon substrates. In: Defense and Security, Orlando, United States, 12-16 Apr 2004. Published in: Infrared Technology and Applications XXX, 5406 ISSN 0277-786X. doi:10.1117/12.545003
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Official URL: http://dx.doi.org/10.1117/12.545003
Abstract
We have demonstrated the successful growth of mercury cadmium telluride (MCT) infrared detector material on silicon substrates. Growth on silicon increases the maximum achievable array size, reduces manufacturing costs, and paves the way for infrared detector growth directly on multiplexing circuits. In addition, the thermal match with multiplexing circuits eliminates the requirement for complex thinning procedures. Since the crystal lattice of MCT is not matched to that of silicon, an intermediate buffer layer is required. We have developed a buffer layer technique that is compatible with MCT grown by Metal Organic Vapour Phase Epitaxy (MOVPE). Long-wavelength heterostructure device designs were grown using this technique. Test devices and 128x128 focal plane arrays were fabricated by wet etching mesa structures and passivating the mesa side-walls with a thin layer of CdTe. An indium flip-chip technique was used to form interconnects between the detector material and test or multiplexing circuit. At 77K, 50x50μm test devices with a 10.2μm cut off wavelength have been measured with R0A~1x103Ohm cm2 at zero bias and R.A~1x104Ohm cm2 at 0.1V reverse bias. Arrays from this material have been demonstrated with operabilities up to 99.7%.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Infrared Technology and Applications XXX | ||||
| Publisher: | SPIE | ||||
| ISSN: | 0277-786X | ||||
| Book Title: | Infrared Technology and Applications XXX | ||||
| Official Date: | August 2004 | ||||
| Dates: |
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| Volume: | 5406 | ||||
| DOI: | 10.1117/12.545003 | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | Defense and Security | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Orlando, United States | ||||
| Date(s) of Event: | 12-16 Apr 2004 |
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