Abstract
The shortwave infrared spectral region is particularly powerful for health monitoring and medical diagnostics, because biological tissues show low absorbance and minimal infrared auto-fluorescence, enabling greater penetration depth and improved resolution in comparison to visible light. Here I will discuss my lab’s development of organic infrared photodetectors using a new generation of semiconducting polymers extending to 1600 nm. Several demonstrations will show the various potential applications including blood pulse measurements, spectroscopic identification, and image reconstruction. Furthermore, we have implemented upconversion imagers that combine photo-sensing and display in a compact structure, to extend the capability of human and machine vision to 1400 nm. In addition, the same infrared polymers are narrow bandgap and present opportunities to create energy dense supercapacitors. Here we present promising n-type polymers that retained 90% of initial capacitance after 2000 charge-discharge cycles. Through current-voltage and spectroscopic measurements, we infer the mechanisms that lead to capacitance fade and suggests structural and electrochemical strategies to realize high-endurance energy storage devices for flexible printed systems.
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