Structure Dependent Photostability of ITIC and ITIC-4F
| Autor: | Laura Ciammaruchi, Edgar Gutiérrez-Fernández, Mariano Campoy-Quiles, Osnat Zapata-Arteaga, Jaime Martín |
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| Přispěvatelé: | European Commission, Ministerio de Economía y Competitividad (España), European Research Council |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen Organic solar cell acceptors chemistry.chemical_element crucial role 02 engineering and technology 010402 general chemistry 01 natural sciences Raman-spectroscopy morphology Molecule General Materials Science Degradation process Spectroscopy polymerfullerene Bond strength photooxidation environmental stability 021001 nanoscience & nanotechnology Acceptor 0104 chemical sciences Crystallography chemistry polymer solar-cells Chemistry (miscellaneous) efficiency photodegradation 0210 nano-technology |
| Zdroj: | Addi: Archivo Digital para la Docencia y la Investigación Universidad del País Vasco Digital.CSIC. Repositorio Institucional del CSIC instname Addi. Archivo Digital para la Docencia y la Investigación Materials Advances |
| Popis: | Strong synthetic and engineering efforts have taken the efficiency of non-fullerene acceptor (NFA) based organic solar cells above 18% in a few years. Nonetheless, a deep understanding of the fundamental properties of this class of molecules is still missing. Here, we systematically investigated the morphological properties of two high efficient indacenodithienothiophene-based NFAs – namely ITIC and ITIC-4F – in order to correlate the hydrogen/fluorination substitutions with the materials structural and stability properties. We confirm that each NFA structurally evolves with increasing temperature into several polymorphs, identifying through spectroscopy their corresponding narrow temperature ranges. We demonstrate that the materials’ response to accelerated stress tests (ASTs) is both substitution and polymorph dependent. ASTs underlined that the most vulnerable molecular segment corresponds to the thienothiophene C[double bond, length as m-dash]C bond along the central backbone, together with the C[double bond, length as m-dash]C linkage between the electron-rich donor and the electron-deficient acceptor moieties, with a degradation process triggered by oxygen and light. ITIC-4F showed lower oxidation capability and a higher bond strength retaining effect compared to ITIC. Lastly, the AST approach employed here allowed for the extrapolation of morphological and stability-related features within a high-throughput framework, and can be considered as a valuable methodological tool for future stability-related studies. The authors would like to thank Dr Tommaso Salzillo and Dr Valentina Bulova for very fruitful scientific discussions. The authors kindly acknowledge the financial support from Ministerio de Economía y Competitividad of Spain through the “Severo Ochoa” Programme for Centres of Excellence in R&D and projects PGC2018-095411-B-I00 and PGC2018-094620-A-I00, as well as the European Research Council (ERC) under grant agreement no. 648901. |
| Databáze: | OpenAIRE |
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