Publication date: 21st July 2025
Organic semiconductors have emerged as promising photocatalysts for solar-driven hydrogen evolution due to their tunable electronic properties, earth-abundant composition, and processability into highly dispersed nanomaterials.[1,2] These materials offer a versatile platform where structural design and functionalization can be tailored to optimize light absorption, charge transport, and interfacial catalytic activity. However, the practical application of organic semiconductors is often hindered by their limited photo(thermal) stability when exposed to prolonged illumination, which can lead to molecular degradation, loss of catalytic efficiency, and reduced device lifetimes. In this work, we address this challenge by investigating the chemical stability of organic nanoparticle dispersions through advanced optical spectroscopy techniques. Raman spectroscopy was employed to monitor molecular vibrations and track photoinduced changes in real time, while complementary steady-state and time-resolved measurements provided further insight into degradation pathways. Overall, our findings uncover critical structure-property relationships and suggest design strategies to improve long-term photocatalytic performance.
We acknowledge financial support from the Generalitat Valenciana under the Plan GenT programme (CIDEIG/2023/17), IDIFEDER/2018/064, and PID2023-152131NB-I00 and CEX2024-001467-M (funded by MICIU/AEI/10.13039/501100011033 and by “ERDF/EU”).
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