Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.421
Publication date: 16th December 2024
Solution deposition from nanoparticle dispersions allows the use of eco-friendly processing agents such as alcohols or water for the fabrication of organic semiconductor thin-films for optoelectronic applications. Primary application of the eco-friendly device production from organic nanoparticles are solar cells where solvents are evaporated on large scale upon drying. Omitting surfactants to stabilize the dispersions is essential to not jeopardize the device performance. In this work, novel surfactant-free nanoparticle dispersions from high-performance organic semiconductors are synthesized by nanoprecipitation and electrostatically stabilized by electrical doping. The corresponding solar cells achieved power conversion efficiencies beyond 10%, matching the performance of reference solar cells deposited from toxic solvents. When applied to organic photodetectors, the nanoparticle approach allows the fabrication of thick absorber layers which enhance the quantum efficiency in the outer parts of the absorption spectrum, yielding enhanced broad-band detectivity. Aqueous dispersions of the organic semiconductor nanoparticles can be used for catalytic hydrogen generation.
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