Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.280
Publication date: 18th December 2023
Organic photovoltaics (OPVs) have emerged as a promising technology for sustainable energy harvesting due to their lightweight, flexibility, and cost-effectiveness. However, realizing their full potential relies heavily on understanding and optimizing the intricate interplay of material properties, especially in the context of optical characteristics.
The optical properties of organic materials, such as absorption and emission spectra, exciton dynamics, and light scattering behavior, play a pivotal role in dictating the overall performance of OPVs. Accurate characterization of these properties provides insights into fundamental processes like exciton generation, dissociation, and charge transport within the active layer. Precise knowledge of absorption spectra enables the selection and design of materials with optimal light-harvesting capabilities, ensuring an absorption range compatible with the source spectrum, whether it is the sun or an artificial source.
Optical characterization techniques provide exceptional sensitivity and precision in probing material properties. Spectroscopic methods, including UV-Vis, Ellipsometry, Photoluminescence and Raman spectroscopy, enable the identification of molecular structures, chemical compositions, and electronic transitions with high accuracy. One of the primary advantages of optical characterization lies in its non-destructive nature. These techniques allow for the examination of materials without altering their intrinsic properties. This non-invasive quality facilitates the continuous monitoring of dynamic processes, making it possible to study real-time changes in materials under varying conditions. Also, as these techniques are contactless and do not require special preparation of the samples in most of the cases are particularly adapted for inline and online quality control on industrial environments.
In this work we present some examples of how the use of techniques such as Ellipsometry, Photoluminescence, optical spectroscopy or raman spectroscopy can help us to better understand the optical properties of the materials that are part of an organic photovoltaic cell, and lead to improvements in the performance on the final device, unveil the mechanism of degradation process es or develop special features on our final device.