Integrated Plasmonic Infrared Photodetector Based on Colloidal HgTe Quantum Dots

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bingqing Zhu
  • Mengyu Chen
  • Qiang Zhu
  • Guodong Zhou
  • Wen Zhou
  • Stephen V. Kershaw
  • Ni Zhao
  • Hon Ki Tsang

Detail(s)

Original languageEnglish
Article number1900354
Journal / PublicationAdvanced Materials Technologies
Volume4
Issue number10
Online published23 Aug 2019
Publication statusPublished - Oct 2019

Abstract

This paper presents a 2300 nm wavelength photodetector which comprises a spin-deposited colloidal HgTe quantum dot (QD) film on a metal-insulator-metal (MIM) plasmonic waveguide. This photodetector is an integrated device based on the complementary metal-oxide-semiconductor compatible silicon-on-insulator platform. The device employs input and output silicon waveguide grating couplers, and HgTe QDs are used as the infrared photosensing material. Infrared light is coupled to the strongly confined MIM waveguide mode, which shrinks the device footprint and improves the light detection efficiency simultaneously. A room temperature responsivity of 23 mA W−1 and a noise-equivalent power of 8.7 × 10−11 W Hz−1/2 at 2300 nm wavelength are achieved by the photodetector at 2.14 W mm−2 (measured at the input to the plasmonic waveguide) with a device footprint of 15 µm × 0.35 µm. The light intensity–dependent photocurrent, the current noise spectral density, and the 3 dB operation bandwidth are all characterized. The charge transfer properties of the organic HgTe QD films are further analyzed based on field effect transistor measurements.

Research Area(s)

  • colloidal quantum dots, infrared photodetectors, plasmonic waveguides, silicon photonics

Citation Format(s)

Integrated Plasmonic Infrared Photodetector Based on Colloidal HgTe Quantum Dots. / Zhu, Bingqing; Chen, Mengyu; Zhu, Qiang et al.

In: Advanced Materials Technologies, Vol. 4, No. 10, 1900354, 10.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review