Share Email Print

Proceedings Paper

Short-wave infrared colloidal quantum dot photodetectors on silicon
Author(s): Chen Hu; Alban Gassenq; Yolanda Justo; Sergii Yakunin; Wolfgang Heiss; Zeger Hens; Gunther Roelkens
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

In this paper, two kinds of colloidal quantum dots, PbS and HgTe, are explored for SWIR photodetectors application. The colloidal dots are prepared by hot injection chemical synthesis, with organic ligands around the dots keeping them stable in solution. For the purpose of achieving efficient carrier transport between the dots in a film, these long organic ligands are replaced by shorter, inorganic ligands. We report uniform, ultra-smooth colloidal QD films without cracks realized by dip-coating and corresponding ligand exchange on a silicon substrate. Metal-free inorganic ligands, such as OH- and S2-, are investigated to facilitate the charge carrier transport in the film. Both PbS and HgTe-based quantum dot photoconductors were fabricated on interdigitated gold electrodes. For PbS-based detectors a responsivity of 200A/W is measured at 1.5μm, due to the large internal photoconductive gain. A 2.2μm cut-off wavelength for PbS photodetectors and 2.8μm for HgTe quantum dot photodetectors are obtained.

Paper Details

Date Published: 4 February 2013
PDF: 8 pages
Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 863127 (4 February 2013); doi: 10.1117/12.2001246
Show Author Affiliations
Chen Hu, Ghent Univ., IMEC (Belgium)
Alban Gassenq, Ghent Univ., IMEC (Belgium)
Yolanda Justo, Ghent Univ. (Belgium)
Sergii Yakunin, Johannes Kepler Univ. of Linz (Austria)
Wolfgang Heiss, Johannes Kepler Univ. of Linz (Austria)
Zeger Hens, Ghent Univ. (Belgium)
Gunther Roelkens , Ghent Univ., IMEC (Belgium)

Published in SPIE Proceedings Vol. 8631:
Quantum Sensing and Nanophotonic Devices X
Manijeh Razeghi, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?