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Authors: C. Pang, Y. Deng, E. Kheradmand, L. Moreno Hagelsieb, D. Cheyns, P. Geiregat, Z. Hens, D. Van Thourhout
Title: A colloidal-quantum-dot solution for photodetection beyond 1.6um
Format: International Conference Presentation
Publication date: Accepted for publication. Not yet published
Journal/Conference/Book: Annual Symposium of the IEEE Photonics Society Benelux Chapter
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Download: Download this Publication (286KB) (286KB)


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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