Performance Limits of Low Bandgap Thermophotovoltaic Antimonide-Based Cells for Low Temperature Radiators Page: 3 of 11
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to the performance of quaternary OMVPE grown cells as function of radiator
Computer simulations using PC-ID require a large number of material
parameters that can be grouped as energy band parameters, carrier mobility
parameters, optical parameters and recombination parameters. The energy band
parameters of the III-V compounds have been compiled by Madelung (1). The
mobility dependence upon carrier concentration for III-V binaries GaAs, GaSb,
InAs and InSb has been reported in several papers (2,3,4). Optical constants of all
the binary III-V compounds have been recently compiled (5). Experimental
values of similar material parameters for the ternaries GaInSb and quaternaries
GaInAsSb have not been reported. They can be estimated with confidence, from
the corresponding material parameters of the binaries GaAs, InAs, GaSb and
InSb, using equations developed by Adachi (6) and we have used that procedure
for estimating those parameters for GaInAs and GaInAsSb alloys with band gaps
in the range of 0.60 eV to 0.50 eV.
Figure 1 shows the measured mobility of electrons and holes in OMVPE
grown quaternary material GaInAsSb with a bandgap of 0.55 eV and compares it
with the mobility calculated using Matthiessen rule starting from the experimental
mobility of the binaries GaAs, InAs, GaSb and InSb. The agreement between the
experimental values and the calculated values is rather good considering the many
ELECTRON AND HOLE MOBILITIES OF Gaxln XAsySb , ALLOY
-JX=0.853 Y=0.128 EG=0.55eV
* MIT-LL Holes Holes
v MIT-LL Electrons
1017 1019 1021
DOPING CONCENTRATION (cm-3)
FIGURE 1. Electron and Hole Mobility of GaInAsSb Alloy.
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Borrego, J.M.; Wang, C.A.; Dutta, P.S.; rajagopalan, G.; Bhat, I.B.; Gutmann, R.J. et al. Performance Limits of Low Bandgap Thermophotovoltaic Antimonide-Based Cells for Low Temperature Radiators, report, August 29, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc733857/m1/3/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.