Graphene-germanium quantum dot photodetector with high sensitivity

Yifei Wang; Vinh X. Ho; Prashant Pradhan; Michael P. Cooney; Nguyen Q. Vinh

doi:10.1117/12.2529371

9 September 2019 Graphene-germanium quantum dot photodetector with high sensitivity

Yifei Wang, Vinh X. Ho, Prashant Pradhan, Michael P. Cooney, Nguyen Q. Vinh

Proceedings Volume 11088, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019; 1108809 (2019) https://doi.org/10.1117/12.2529371
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Graphene-based photodetectors have attracted strong interest for realizing optoelectronic devices, including photodetectors. Here we report a simple fabrication of graphene-germanium quantum dots for broadband light detection from visible to infrared region. The photodetectors show an improved responsivity and response speed. Specifically, the fabricated germanium quantum dots on graphene photodetector shows a responsivity of 1,500 A/W at room temperature and the response time is as fast as ~ 1 ms. These results address key challenges for broadband photodetectors from visible to infrared region, and are promising for the development of graphene-based optoelectronic applications.

Citation Download Citation

Yifei Wang, Vinh X. Ho, Prashant Pradhan, Michael P. Cooney, and Nguyen Q. Vinh "Graphene-germanium quantum dot photodetector with high sensitivity", Proc. SPIE 11088, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019, 1108809 (9 September 2019); https://doi.org/10.1117/12.2529371

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