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Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs
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Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs
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Journal Article
Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs
2023
Overview
Short‐circuit defects caused by microscale dust particles in organic light‐emitting diodes (OLEDs) cause a decrease in production yield and hinder cost reduction. An organic layer coating by solution process is used to prevent short‐circuit defects of particles on a substrate. In this study, the coverage properties of a coated organic layer on size‐controlled particles are revealed. The surface of the substrate with size‐controlled SiO2 particles with a diameter of 0.2–5 µm is quantitatively contaminated, and the particle coverage properties of the solution‐processed hole injection layer are investigated. From the results of the leakage current measurement and cross‐sectional observation by a transmission electron microscope, it is observed that devices with 50 nm‐spin‐coated poly (3,4‐ethylenedioxythiophene): poly(styrene sulfonate) can cover SiO2 particles up to 1 µm in diameter without any increase in leakage current. It is revealed that larger‐sized particles cause electric defects, albeit with a low probability, owing to the larger space under the particles. To fabricate OLEDs with a high yield, the shape of the coverage at the bottom of the particle is important in preventing electric defects. The results of this study are useful not only for OLEDs but also for printed and coated devices. To prevent short‐circuit defects caused by dust particles on substrates, the particle coverage properties of the spin‐coated hole injection layer are reported. Quantitatively contaminating the substrate surface with size‐controlled SiO2 particles, poly(3,4‐ethylenedioxy‐thiophene):poly(styrene sulfonate) is spin‐coated, resulting in coverage up to SiO2 particles 10–20 times larger than the film thickness.
Publisher
Wiley,John Wiley & Sons, Inc,Wiley-VCH
