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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 25,
  • Issue 4,
  • pp. 1053-1060
  • (2007)

Thin-Film III–V Photodetectors Integrated on Silicon-on-Insulator Photonic ICs

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Abstract

We critically assess recent progress in the integration of near-infrared photodetectors onto nanophotonic silicon-on-insulator (SOI) waveguide circuits. Integration of thin-film InGaAs photodetectors is studied in detail. This method consists of bonding unprocessed III–V dies onto the SOI substrate using an intermediate adhesive layer. Both benzocyclobutene and spin-on glass are studied and compared as bonding agents. After the removal of the III–V substrate, the thin-film detectors are fabricated using wafer-scale-compatible processes and lithographically aligned to the underlying SOI waveguides. The process is compatible with the fabrication of InP/InGaAsP laser diodes on SOI. A new design of an evanescently coupled metal–semiconductor–metal detector is proposed, proving the ability to obtain compact and highly efficient integrated InGaAs photodetectors.

© 2007 IEEE

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