High speed antimony-based superlattice photodetectors transferred on sapphire

Arash Dehzangi, Ryan P McClintock, Donghai Wu, Jiakai Li, Stephen M. Johnson, Emily Dial, Manijeh Razeghi

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We report the substrate transfer of InAs/GaSb/AlSb based type-II superlattice (T2SL) e-SWIR photodetector from native GaSb substrates to low-loss sapphire substrate in order to enhance the frequency response of the device. We have demonstrated the damage-free transfer of T2SL-based thin-films to sapphire substrate using top-down processing and a chemical epilayer release technique. After transfer the -3 dB cut-off frequency increased from 6.4 GHz to 17.2 GHz, for 8 μm diameter circular mesas under -15 V applied bias. We also investigated the cut-off frequency verses applied bias and lateral scaling to assess the limitations for even higher frequency performance.

Original languageEnglish (US)
Article number116502
JournalApplied Physics Express
Issue number11
StatePublished - Nov 1 2019

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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