All InGaAs Unipolar Barrier Infrared Detectors

Uzgur F., Karaca U., Kizilkan E., Kocaman S.

IEEE TRANSACTIONS ON ELECTRON DEVICES, vol.65, pp.1397-1403, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 65
  • Publication Date: 2018
  • Doi Number: 10.1109/ted.2018.2804483
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1397-1403
  • Keywords: Compositional grading, delta doping, infrared detectors, InGaAs, nBn, unipolar barrier, LOW DARK-CURRENT, I-N PHOTODIODE, FERMI-LEVEL, SURFACE RECOMBINATION, NUMERICAL-SIMULATION, PASSIVATION, INP, IN0.53GA0.47AS, PHOTODETECTORS, LAYER
  • Middle East Technical University Affiliated: Yes


Unipolar barrier detector design is a challenge for InGaAs material system since there is a lack of proper barrier material that blocks majority carriers and allows unimpeded flow of minority carriers. As a bandgap engineering solution, Al/Sb free all InGaAs unipolar barrier detectors have been numerically designed here by compositionally graded and delta-doped layers. Comparison with conventional heterojunction detectors results that there is at least one order of magnitude improvement in dark current without compromising any photoresponse performance. Detailed simulation characterization studies including sensitivity analysis with respect to the design parameters verify the robustness of the proposed structure.