Understanding the langmuir and Langmuir-Schaefer film conformation of low-bandgap polymers and their bulk heterojunctions with PCBM

Autor(es)

Silva, Edilene A. ^{[1, 2]} ; Gregori, Alberto ^{[3, 2]} ; Fernandes, Jose D. ^[1] ; Njel, Christian ^[4] ; Dedryvere, Remi ^[2] ; Constantino, Carlos J. L. ^[1] ; Hiorns, Roger C. ^[2] ; Lartigau-Dagron, Christine ^[2] ; Olivati, Clarissa A. ^[2]

Afiliação do(s) autor(es)

^[1] UNESP, Fac Ciencias & Tecnol, Dept Fis, Rua Roberto Simonsen 305, Presidente Prudente, SP - Brazil

^[2] Univ Pau & Pays Adour, IPREM, CNRS, E2S UPPA, Pau - France

^[3] Ist Italiano Tecnol, Ctr Sustainable Future Technol, Via Livorno 60, I-10144 Turin - Italy

^[4] Karlsruhe Inst Technol KIT, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen - Germany

• Tipo de documento: Artigo Científico
• Fonte: Nanotechnology; v. 31, n. 31 JUL 31 2020.
• Citações Web of Science: 0

Resumo

Low-bandgap polymers are widely used as p-type components in photoactive layers of organic solar cells, due to their ability to capture a large portion of the solar spectrum. The comprehension of their supramolecular assembly is crucial in achieving high-performance organic electronic devices. Here we synthezed two exemplar low-bandgap cyclopentadithiophene (CPDT):diketopyrrolopyrrole (DPP)-based polymers, with either a twelve carbon (C12) or a tri etyleneglycol (TEG) side chains on the DPP units (respectively denoted PCPDTDPP\_C12 and PCPDTDPP\_TEG). We deposited Langmuir-Schaefer films of these polymers blended with the widely used electron donor material {[}6,6]-phenyl-C61-butyric-acid methyl ester (PCBM). We then characterized the conformational, optical and morphological properties of these films. From the monolayers to the solid films, we observed distinct self-organization and surface properties for each polymer due to the distinct nature of their side chains. Emphasizing their attraction interactions with PCBM and the phase transitions according to the surface pressure. The elements amount on the surface, calculated through the XPS, gave us a good insight on the polymers' conformations. Through UV-visible absorption spectroscopy, the improvement in the PCPDTDPP film ordering upon PCBM addition is evident and we saw the contribution of the polymer units on the optical response. Chemical attributions of the polymers were assigned using FTIR Spectroscopy and Raman Scattering, revealing the physical interaction after mixing the materials. We showed that it is possible to build nanostructured PCPDTDPPs films with a high control of their molecular properties through an understanding of their self-assembly and interactions with an n-type material. (AU)

• Processo FAPESP: 14/13739-7 - Estudo e caracterização elétrica de células fotovoltaicas a partir de filmes finos orgânicos
• Beneficiário: Clarissa de Almeida Olivati
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 14/11410-8 - EMU concedido no processo 2013/14262-7: Streamline Renishaw
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários