Abstract

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.

Related Research Topics

• Integration of colloidal quantum dots with PICs