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Title: Air-stable short-wave infrared PbS colloidal quantum dot photoconductors passivated with Al{sub 2}O{sub 3} atomic layer deposition

A PbS colloidal quantum dot photoconductor with Al{sub 2}O{sub 3} atomic layer deposition (ALD) passivation for air-stable operation is presented. Two different types of inorganic ligands for the quantum dots, S{sup 2−} and OH{sup −}, are investigated. PbS/S{sup 2−} photoconductors with a cut-off wavelength up to 2.4 μm are obtained, and a responsivity up to 50 A/W at 1550 nm is reported. The corresponding specific detectivity is ∼3.4 × 10{sup 8} Jones at 230 K. The 3-dB bandwidth of the PbS/S{sup 2−} and PbS/OH{sup −} photodetectors is 40 Hz and 11 Hz, respectively.
Authors:
 [1] ;  [2] ;  [2] ; ; ;  [1] ;  [2] ; ;  [3] ;  [2] ; ;  [4]
  1. Photonics Research Group-INTEC, Ghent University-imec, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium)
  2. (Belgium)
  3. Center for Nano-and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium)
  4. Department of Solid State Sciences, Universiteit Gent, Krijgslaan 281-S1, 9000 Ghent (Belgium)
Publication Date:
OSTI Identifier:
22310644
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AIR; ALUMINIUM OXIDES; LEAD SULFIDES; PASSIVATION; PHOTOCONDUCTORS; PHOTODETECTORS; QUANTUM DOTS; TEMPERATURE RANGE 0273-0400 K