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Proceedings Paper

Ultra-sensitive SWIR FPA with enhanced quantum efficiency based on electron multi-injector
Author(s): Simone Bianconi; Hooman Mohseni
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Paper Abstract

By leveraging a three-dimensional device structure to decouple the optical and electronic areas of the detectors, Electron Injector (EI) technology has proven capable of surpassing the current performance of commercial short-wave infrared (SWIR) cameras. The improvement in sensitivity enabled by a nanoscale electronic area, however, comes at the cost of a decrease in quantum efficiency: the diffusion length of the minority carriers limits the area over which a photo-generated carrier can be collected at the small electron injector junction before recombining. This intrinsic limitation hinders the prospect of further improvements of the EI detector performance.

We here present a novel device architecture consisting of multiple nanoscale electron injectors connected to the same contact and constituting one individual pixel: by appropriate spacing of the injectors within the diffusion length of the photogenerated excess carriers, the fill factor of such multi-injector pixel can be considerably improved. The presented design was successfully implemented into an integrated FPA for SWIR imaging, showing excellent pixel yield, and a sensitivity of ~10 photons. While the high sensitivity is enabled by the small size of the 1μm injectors, the multi-injector design allows to achieve an area fill factor or ~20% of the 30x30μm pixel area, which is considerably higher than that of a single-injector design.

In summary, we demonstrate a highly sensitive SWIR FPA based on 1μm electron multi-injector design, which allows for a substantial improvement of the imager’s quantum efficiency and sensitivity.

Paper Details

Date Published: 31 January 2020
PDF: 7 pages
Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112882H (31 January 2020); doi: 10.1117/12.2546660
Show Author Affiliations
Simone Bianconi, Northwestern Univ. (United States)
Hooman Mohseni, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 11288:
Quantum Sensing and Nano Electronics and Photonics XVII
Manijeh Razeghi; Jay S. Lewis; Giti A. Khodaparast; Pedram Khalili, Editor(s)

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