Squaraine Dyes for Single-Component Shortwave Infrared-Sensitive Photodiodes and Upconversion Photodetectors

W.-H. Hu, F. Nüesch, D. Giavazzi, M. Jafarpour, R. Hany, M. Bauer, . Adv. Optical Mater. 2024, 12, 2302105. https://doi.org/10.1002/adom.202302105

This research focuses on using squaraine dyes in single-component shortwave infrared (SWIR) photodiodes and upconversion photodetectors. These devices achieve over 40% external quantum efficiency beyond 1000 nm through field-assisted exciton dissociation. By integrating SWIR photodiodes with organic LEDs, they convert SWIR photons into visible light, offering an alternative to inorganic imaging technologies.

Key Points

Efficient SWIR Detection: Over 40% external quantum efficiency beyond 1000 nm.

Field-Assisted Charge Generation: Enables efficient exciton dissociation.

Upconversion Photodetectors: Combine SWIR photodiodes with OLEDs for visible light emission.

Simplified Fabrication: Single-component layers enhance stability and reduce complexity.

Inorganic Alternative: Potential replacement for existing inorganic SWIR imaging technologies.

How Setfos Was Used

Setfos was employed for optical simulations, analyzing device layer properties using refractive index and extinction coefficient values. These simulations optimized light absorption and exciton generation, crucial for efficient SWIR detection and upconversion.