Performance assesment of indium antimonide photodetectors on silicon substrates

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2003

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Tümkaya, Ümid

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In this study, detailed characteristics and performance assessment of 3-5 æm p-i-n InSb photodetectors on Si substrates are reported. The detector epilayers were grown on GaAs coated Si substrates by molecular beam apitaxy (MBE). Both homojunction and single heterojunction (AlInSb/InSb) detector structures were investigated. Arrays of 33x33 æm2 detectors were fabricated and flip-chip bonded to a test substrate for detailed electrical and optical characterization. A peak detectivity as high as 1x1010 cmHz1/2/W was achieved with InSb homojunction detectors on Si substrate in spite of the large lattice mismatch between InSb and Si (%19). In both homojunction and single heterojunction structures the differential resistance is significantly degraded by trap assisted tunneling (TAT) under moderately large reverse bias and by ohmic leakage near zero-bias. While the heterojunction structures provide a higher 80 K zero bias differential resistance, the responsivity of this structure is significantly lower than that of homojunction InSb photodiodes. In both homojunction and heterojunction photodetectors, 80K 1/f noise is dominated by TAT processes, and the noise current at 1 Hz follows the empirical relation in= aTAT(ITAT) β with aTAT~1.1x10ا6 and β~0.53.

Subject Keywords

Optical detectors, Photodetector, AllnSb, InSb, Focal plane array

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http://etd.lib.metu.edu.tr/upload/756403/index.pdf
https://hdl.handle.net/11511/13522

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ü. Tümkaya, “Performance assesment of indium antimonide photodetectors on silicon substrates,” M.S. - Master of Science, Middle East Technical University, 2003.