Fully spray coated organic photodiodes.

Area of Science:

• Organic electronics
• Photodetector fabrication
• Materials science

Background:

• Solution-processed organic diodes utilizing bulk heterojunctions are promising for large-area photodetection.
• Current fabrication methods like blade or spin-coating have limitations for scalable manufacturing.

Purpose of the Study:

• To develop a general approach for fully spray-coated organic photodiodes.
• To evaluate the performance and stability of spray-coated organic photodetectors.

Main Methods:

• Fabrication of organic photodiodes using a fully spray-coating technique.
• Characterization of device performance, including responsivity and noise equivalent power.
• Assessment of device lifetime, yield, and reproducibility.

Main Results:

• Spray-coated organic photodetectors achieved responsivities of 0.36 A/W and noise equivalent powers of 0.2 pW/Hz^(1/2) in the visible spectrum at -5 V reverse bias.
• Demonstrated device lifetimes exceeding 1 year.
• Achieved superior yield and reproducibility for dark current and photocurrent densities compared to other methods.

Conclusions:

• Spray-coating is a viable and advantageous method for fabricating high-performance organic photodiodes.
• This approach offers a scalable and cost-effective solution for large-area photodetection applications.
• The developed method overcomes challenges associated with surface roughness and morphology in spray-deposited layers.