Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.238
Publication date: 22nd December 2022
Recent advancements in material design and related power conversion efficiency (PCE) improvements; organic photovoltaics (OPVs) are positioned as a very promising technology for the needed green energy transition. Particularly, the development of non-fullerene acceptors (NFAs) is continuously raising the bar for PCE and device stability. However, translating these findings to industrially applicable techniques, while maintaining high performance and stability parameters, remains a significant challenge. The aim of this study is to facilitate a paradigm shift in the development of OPV by introducing a device structure which can maintain its morphology over a longer period of time. Sequentially depositing the donor and acceptor materials to create bilayer architecture, where the morphology governing nano interfaces throughout the bulk is eliminated, provides an efficient method to develop morphologically robust OPVs. Here investigation on different active layer thicknesses using PM6 and Y7 materials have been carried out to see how varied donor and acceptor layer thicknessess effect charge transport and recombination behavior, and how the device's performance can be tweaked further. Combined with the electrical and morphological characterizations, the device performance of bilayers has also been compared with the conventional bulk-heterojunctions (BHJs). To further illustrate the significant advantages of bilayer structure over BHJs, the photo and thermal degradation measurements have not only been conducted for PM6 ̶ Y7, but for a number of other NFA systems like PM6 ̶ IT4F, PM6 ̶ Y6, PM6 ̶ N3, PBDB-T ̶ ITIC, TPD-3F ̶ IT4F, PCE10 ̶ O-IDTBR, and more demonstrating the robustness of the structure.
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