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

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4900930· OSTI ID:22310644

Hu, Chen ^[1]; Gassenq, Alban; Chen, Hongtao; Roelkens, Günther ^[1]; Justo, Yolanda; Hens, Zeger ^[2]; Devloo-Casier, Kilian; Detavernier, Christophe ^[3]

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1. Photonics Research Group-INTEC, Ghent University-imec, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium)
2. Center for Nano-and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium)
3. Department of Solid State Sciences, Universiteit Gent, Krijgslaan 281-S1, 9000 Ghent (Belgium)

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.

• OSTI ID: 22310644
• Journal Information: Applied Physics Letters, Vol. 105, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AIR
ALUMINIUM OXIDES
LEAD SULFIDES
PASSIVATION
PHOTOCONDUCTORS
PHOTODETECTORS
QUANTUM DOTS
TEMPERATURE RANGE 0273-0400 K