Determination of exciton diffusion coefficient in conjugated polymer films: Novel method based on spectroelectrochemical techniques
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Título: | Determination of exciton diffusion coefficient in conjugated polymer films: Novel method based on spectroelectrochemical techniques |
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Autor/es: | Montilla, Francisco | Quintero-Jaime, Andrés Felipe | Huerta Arráez, Francisco | Quijada Tomás, César |
Grupo/s de investigación o GITE: | Electrocatálisis y Electroquímica de Polímeros |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Exciton diffusion coefficient | Conjugated polymer films | Spectroelectrochemical techniques |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 1-may-2021 |
Editor: | Elsevier |
Cita bibliográfica: | Electrochimica Acta. 2021, 387: 138419. https://doi.org/10.1016/j.electacta.2021.138419 |
Resumen: | The understanding of exciton dynamics is a central issue in the operation of conjugated polymer-based optoelectronic devices, like solar cells, light-emitting diodes or electrochemiluminescent cells. In this work, we explore the applicability of combined in situ electrochemical fluorescence and UV-vis spectroscopies for the study of electrochemically induced quenching of photoluminescence as novel tools for the determination of exciton diffusion in a model conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylvynilene] (MEH-PPV). It is demonstrated that the quenching process observed upon electrochemical doping follows a linear Stern-Volmer mechanism at low doping levels, with a time-independent rate constant typical of diffusion-controlled annihilation processes. From the Stern-Volmer rate constant and the exciton-polaron critical distance, an exciton diffusion coefficient is derived whose value is in close agreement with those reported in the literature. These results support the suitability of these spectroelectrochemical techniques as fast and powerful alternative tools for the reliable determination of exciton diffusion coefficients in conjugated polymers. |
Patrocinador/es: | This work was supported by Generalitat Valenciana (Conselleria de Educación, Investigación, Cultura y Deporte) project PROMETEO/2018/087 and Spanish Ministerio de Ciencia e Innovación (project PID2019-105923RB-I00). |
URI: | http://hdl.handle.net/10045/117708 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2021.138419 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2021 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.electacta.2021.138419 |
Aparece en las colecciones: | INV - GEPE - Artículos de Revistas |
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Archivo | Descripción | Tamaño | Formato | |
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Montilla_etal_2021_ElectrochimActa_final.pdf | Versión final (acceso restringido) | 883,72 kB | Adobe PDF | Abrir Solicitar una copia |
Montilla_etal_2021_ElectrochimActa_accepted.pdf | Accepted Manuscript (acceso abierto) | 558,58 kB | Adobe PDF | Abrir Vista previa |
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