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High Detectivity Green Light Selective Organic Photodiodes for CMOS Color Image Sensors

Journal
ACS Applied Materials & Interfaces
Date
2020.11.09
Abstract
Novel D-π-A molecules are designed, synthesized, and characterized as green-light-selective absorbers in this work for application to organic-on-silicon hybrid CMOS color image sensors. The p-type molecules, combined with two respective fused-type heterocyclic donors and an electron-accepting unit, approach the cyanine-like properties characterized by intense and sharp absorption. This molecular design leads to improved absorption properties, thermal stability, and the high photoelectric conversion compared to a non-fused ring based molecular design. A maximum external quantum efficiency of 66% (at λmax = 550 nm) and a high specific detectivity (D*) of 8 x 1013 cm Hz1/2 W-1 are achieved in an OPD consisting of the bulk heterojunction blend with two transparent electrodes on both sides. Finally, the green-light-detection ability of the green narrow-band OPD is demonstrated by optical simulation of an organic-on-Si hybrid stacked-type full-color photodetector composed of the green-light-selective OPD and a bottom silicon photodiode with only blue and red color filters.
Reference
ACS Appl. Mater. Interfaces 2020, 12, 51688
DOI
http://dx.doi.org/10.1021/acsami.0c14237