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Authors: L. Elsinger, R. Petit, F. Van Acker, N. K. Zawacka, I. Tanghe, K. Neyts, C. Detavernier, P. Geiregat, Z. Hens, D. Van Thourhout
Title: Waveguide-Coupled Colloidal Quantum Dot Light Emitting Diodes and Detectors on a Silicon Nitride Platform
Format: International Journal
Publication date: 5/2021
Journal/Conference/Book: Lasers & Photonics Reviews
Editor/Publisher: Wiley, 
Volume(Issue): 15(7) p.n/a - n/a
Location: Gent, Belgium
DOI: 10.1002/lpor.202000230
Citations: 18 ( - last update: 14/7/2024)
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Colloidal quantum dots (QDs) are an attractive light source for visiblephotonics, in particular their widely tunable emission wavelength,inexpensive wet-chemical synthesis and straight-forward hybrid integrationcan make the difference. In this work, integrated light-emitting diodes aredemonstrated based on CdSe/CdS QDs, with the emission directly coupled toa silicon nitride waveguide. The devices feature a record current density of upto 100 A cm−2and a maximum on-chip power density of almost 1.5 W cm−2in a single-mode waveguide. Operated as detectors, the photodiodes have alow dark current of 1.5 μA cm−2. It is anticipated, that the devices will find anapplication in chip-based absorption spectroscopy and bio-sensing, as theycan be post-processed on foundry-fabricated waveguide platforms, at a lowcost. In addition, this approach provides the missing low-loss waveguidelayer, necessary for building an electrically pumped laser using colloidal QDs.

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