Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M34: Photodetectors and Optical Emitters
8:00 AM–10:48 AM,
Wednesday, March 8, 2023
Room: Room 226/227
Sponsoring
Unit:
FIAP
Chair: Jay Mathews, University of Dayton
Abstract: M34.00008 : Hyperdoped Si photodetectors for high efficiency and extended conversion range
9:24 AM–9:36 AM
Presenter:
Yining Liu
(University of Dayton)
Authors:
Yining Liu
(University of Dayton)
Wenjie Yang
(ANU)
Jeffrey Warrender
(Benet lab)
Quentin M Hudspeth
(Benet Laboratories)
James S Williams
(Australian Natl Univ)
Andrew Sarangan
(UD)
Imad Agha
(UD)
Jay A Mathews
(Univ of Dayton)
To achieve high-efficiency devices, optical absorption must be maximized, and high quality Ohmic contacts must be formed for carrier extraction. In this work, we explored methods for both increasing optical absorption in hyperdoped Si and forming Ohmic contacts to such materials with the goal of creating photodetectors with increased efficiency. We fabricated Si layers hyperdoped with Au or Ti at varying thickness, measured the optical absorption, and then attempted to form Ohmic contacts to the layers. Finally, we fabricated prototype PN junction photodiodes using the best contact methods and measured their photoresponse. The results show significant enhancement of optical absorption by increasing the implant energy. Recipes for Ohmic contacts to each material were demonstrated with a contact resistivity of 0.1 Ohm-cm2. The photodetectors showed significant response at wavelengths up to 2 µm, well beyond the Si bandgap. The quantum efficiency of a Si:Au detector was found to be 0.6% at 1550nm, two orders of magnitude higher than previous work.
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