Affiliation:
1. Sensors Directorate Air Force Research Laboratory Wright‐Patterson AFB OH 45433 USA
2. National Research Council (NRC) Research Associate Program at the Sensors Directorate Air Force Research Laboratory Wright‐Patterson AFB OH 45433 USA
3. KBR Beavercreek OH 45431 USA
4. School of Chemistry and Biochemistry School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA
Abstract
AbstractShortwave infrared (SWIR, λ = 1–3 µm) photodetectors typically use compound semiconductors that are fabricated using high‐temperature epitaxial growth and require active cooling. New technologies that overcome these constraints are the focus of intensive current research. Herein, oxidative chemical vapor deposition (oCVD) is used for the first time to create a room temperature, vapor‐phase deposited SWIR photoconductive detector with a unique tangled wire film morphology that detects nW‐level photons emitted from a 500 °C cavity blackbody radiator—a rarity for polymer systems. A new, window‐based process that greatly simplifies device fabrication is used to construct doped polythiophene‐based SWIR sensors. The detectors feature an 8.97 kΩ dark resistance and are limited by 1/f noise. They feature an external quantum efficiency (gain‐external quantum efficiency) product of 395% and have a measured specific detectivity (D*) of 106 Jones, with the potential to reach D* = 1010 Jones after 1/f noise is minimized. Still, the measured D* is only a factor of 102 lower than a typical microbolometer and after optimization, the newly described oCVD polymer‐based IR detectors will be in a category competitive with commercially available, room temperature lead salt photoconductors and within reach of room temperature photodiodes.
Funder
Air Force Office of Scientific Research
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry
Cited by
1 articles.
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