Organic Photodetectors for Medical Sensors

Organic Photodetectors with High Sensitivity for Medical Sensors and Fingerprint Recognition

Organic Photodetectors for Medical Sensors now the next step. Researchers created highly sensitive, transparent organic photodetectors that are compatible with CMOS fabrication techniques. These photodetectors absorb green light. They created an organic-silicon hybrid RGB imaging sensor by fusing one of these green organic photodetectors with a silicon photodiode that had red and blue filters. Credit goes to Ajou University’s Sungjun Park.

New photodetectors that absorb green light may be beneficial for fingerprint recognition, medical sensors, and other applications. Researchers have created and demonstrated brand-new, highly sensitive, transparent organic photodetectors that can be made using CMOS manufacturing techniques. These novel photodetectors could be incorporated into organic-silicon hybrid image sensors for a variety of uses. These include tools for fingerprint identification, heart-rate monitoring based on light, and detecting the presence of surrounding items.

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Today, August 26, 2022, the researchers publish a description of the novel organic photodetectors in Optica, a high-impact academic publication from the Optica Publishing Group. By combining the transparent, green-absorbing organic photodetector with a silicon photodiode that had red and blue filters, they were also able to build a hybrid RGB imaging sensor.

The sensitivity of most organic compounds to temperature makes them unsuitable for mass production. They either become unstable when utilized for an extended period of time at moderate temperatures or they are unable to sustain the high temperatures required for post-processing. The researchers concentrated on changing the buffer layer of the photodetector to increase stability, effectiveness, and detectivity to overcome this obstacle. A sensor’s detectivity refers to how well it can pick up weak signals.

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 Sungjun Park stated, “We introduced a bathocuproine (BCP):C60 mixed buffer layer as an electron carrying layer. This resulted in the organic photodetectors’ having unique qualities, such as greater efficiency and a very low dark current that lowers noise. 

The researchers showed that the detectivity of the novel photodetectors was on par with that of traditional silicon photodiodes. The detectors demonstrated long-term operational stability at 85 °C (185 °F) for 30 days while operating steadily at temperatures exceeding 150 °C (302 °F) for 2 hours. Additionally, the photodetectors showed good color expression.

 Source: scitechdaily