Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Organic semiconductors have risen as promising materials for the green transition thanks to the easy tunability of their optoelectronic properties, their low price and their easy processability and scalability.[1–3] These materials can be directly applied into energy harvesting devices such as organic photovoltaics (OPVs) or water‑splitting devices to generate and store solar energy.[4–6] However, they still present several drawbacks that hinder their large-scale implementation. One of their main unsolved drawbacks is their poor stability. The constant excitation of the organic semiconductor materials leads to the generation of triplet states, which can, either directly or through the generation of singlet oxygen, 1ΔgO2, lead to the rapid degradation of the devices.[7,7–11] Moreover, state-of-the-art OPV,[12,13] require the use of hazardous organic solvents during their production, which limits their scalability. To solve these two issues, we have turned towards nature. In an attempt to mimic chloroplasts, we intend to encapsulate the organic semiconductor as water-processable dispersions removing the requirements for toxic solvents.[14–16] Moreover, we will add different antioxidants to the organic semiconductor mixtures as to quench the triplet states and 1ΔgO2 thus increasing the lifetime of the devices.[17–21]
With that objective in mind, we have sought out stablish and optimize the parameters that affect the production and performance of PC12/ITIC nanoparticles in OPVs. Moreover, a screening of both natural and artificial antioxidants has been carried out to find the best performing ones in this organic semiconductor mix, with the aim of introducing them into the nanoparticles.
The authors acknowledge the support from the Carlsberg Foundation for project Artplast, Danmarks Frie Forskningsfond for the project ArtPlast and Danfoss for the Fabrikant Mads Claussens project "Electrically assisted slot-dye deposition to enhance the packing of organic semiconductor nanoparticles for organic photovoltaics".
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