Journal
APPLIED PHYSICS LETTERS
Volume 120, Issue 23, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0091625
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Funding
- Hong Kong Research Grants Council/National Natural Science Foundation of China Joint Research Scheme [N_CUHK423/21, AoE/P-701/20]
- Postdoctoral Hub-Innovation and Technology Fund (PH-ITF)
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In this work, a high-speed waveguide-integrated photodetector using two-dimensional materials is proposed and experimentally demonstrated. The detector exhibits high responsivity and speed performance.
Hybrid integration of two-dimensional (2D) materials with photonic integrated circuits can enable additional functionality in planar waveguides based on excellent optical and electrical properties of 2D materials. 2D layered palladium diselenide (PdSe2) has a narrow energy bandgap and high carrier mobility, and its stability under normal laboratory environment conditions makes it of interest for use as high-performance infrared photodetectors. In this work, we propose and experimentally demonstrate a high-speed waveguide-integrated photodetector which uses chemical vapor deposition grown PdSe2 transferred onto a silicon waveguide. At 1550 nm wavelength, the photodetector can be operated without external bias with a responsivity of 0.57 mA/W and a responsivity of 20 mA/W at 6 V bias voltage. The detector had an impulse response full-width-half-maximum pulse width of about 11 ps, corresponding to a 3-dB bandwidth of 40 GHz. Published under an exclusive license by AIP Publishing.
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