15 research outputs found
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Degradation of ITO/silicon solar cells. Final report
The research under this contract investigated the degradation mechanisms and projected lifetime of indium tin oxide (ITO/P-silicon) solar cells. Both single and polycrystalline silicon cells were investigated. Thermal degradation of the cells was shown to proceed by the growth of an interfacial SiO/sub 2/ which resulted from oxygen diffusion through the ITO. The growth of the interfacial SiO/sub 2/ causes reduction in fill factor but not V/sub oc/ or I/sub sc/ until the degradation is severe. While thermal degradation occurs, it proceeds very slowly at 50/sup 0/C and the cell efficiency is projected to remain above 50% of its original value for 10/sup 5/ years at this temperature. Cells subjected to illuminated load testing at room temperature for 840 hours showed no reduction in output. However, some changes were noted in the dark characteristics. The mechanism causing the change is not known. Preliminary noise spectral density reliability tests were conducted but the results were inconclusive
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The oxide defined VCSEL-based smart pixels for the optical database filter
This paper presents the construction of the smart pixel arrays which perform AND and XOR functions with three-input and one-output optical signals for the application of an optical database filter. The device is based on oxide confined VCSELs bump bonded to GaAs MESFET pixels. The MSM photodetectors are monolithically integrated with MESFETs