|C. Pang, Y. Deng, E. Kheradmand, L. Moreno Hagelsieb, D. Cheyns, P. Geiregat, Z. Hens, D. Van Thourhout
|A colloidal-quantum-dot solution for photodetection beyond 1.6um
|International Conference Presentation
|Accepted for publication. Not yet published
|Annual Symposium of the IEEE Photonics Society Benelux Chapter
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Photodetection beyond the wavelength of 1.6µm remains a challenge in silicon photonics due to the absence of suitable epitaxial materials. In this study, we have successfully integrated lead sulfide (PbS) colloidal quantum dot photodiodes (QDPDs) onto silicon waveguides using standard process techniques. The integrated photodiodes exhibit a remarkable responsivity of 1.3 A/W (with an external quantum efficiency of 74.8%) at a wavelength of 2.1µm, a low dark current of only 106 nA and a bandwidth of 1.1 MHz under a -3 V bias. To demonstrate the scalability of our integration approach, we have developed a compact 8-channel spectrometer incorporating an array of QDPDs. This achievement marks a significant step toward realizing a cost-effective photodetector solution for silicon photonics, particularly tailored for a wide range of sensing applications around the 2 µm wavelength range.
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