Conference contribution
(Conference Contribution)

Short-wave infrared colloidal quantum dot photodetectors on silicon

Publication Details
Author(s): Hu C, Gassenq A, Justo Y, Yakunin S, Heiß W, Hens Z, Roelkens G
Publication year: 2013
Volume: 8631
Conference Proceedings Title: 8631
ISBN: 9780819494009

Event details
Event: Quantum Sensing and Nanophotonic Devices X
Event location: San Francisco, CA
Start date of the event: 02/02/2013
End date of the event: 04/02/2013


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 S 2-, 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. © 2013 SPIE.

How to cite
APA: Hu, C., Gassenq, A., Justo, Y., Yakunin, S., Heiß, W., Hens, Z., & Roelkens, G. (2013). Short-wave infrared colloidal quantum dot photodetectors on silicon. In 8631. San Francisco, CA, US.

MLA: Hu, Chen, et al. "Short-wave infrared colloidal quantum dot photodetectors on silicon." Proceedings of the Quantum Sensing and Nanophotonic Devices X, San Francisco, CA 2013.

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