Enhanced performance of poly(3-hexylthiophene)-based electrochromic devices by adding a mesoporous TiO2 layer
Por:
Baray-Calderon, A., Camacho-Caceres, J., Hernandez-Guzman, F., Hu, Hailin, Nicho, M. E.
Publicada:
1 mar 2023
Ahead of Print:
1 ene 2023
Resumen:
Poly(3-hexylthiophene) (P3HT) has been proved to be an electrochromic
material. It is usually deposited as a thin film on a transparent
conducting (TCO) electrode to form a single or dual electrochromic
devices, depending on the counter electrode structure. In this work, a
mesoporous titanium oxide film (m-TiO2) is added between P3HT and TCO.
Cross-sectional scanning electron microscope (SEM) images of the
m-TiO2/P3HT double layer indicate that P3HT diffuses into the porous
structure of m-TiO2 to become a hybrid nanocomposite layer of
mTiO2:P3HT. Cyclic voltammetry measurements of m-TiO2:P3HT show the
predominant electrochromic behavior of the P3HT in the nanocomposite.
Optical transmittance spectra of polarized m-TiO2:P3HT electrodes, in
comparison with the single P3HT ones, show a maximum contrast increase
from 25.6 % to 32.4 % for single devices and from 40.9 % to 47.1 %
for dual devices. Furthermore, the kinetic optical transmittance curves
of mTiO2:P3HT-based devices give a faster switching time between
bleaching and darkening, as well as a better stability for longer cycles
than P3HT-based devices. It is demonstrated that the electrochromic
performance is enhanced by the addition of a mesoporous TiO2 layer in
electroactive polymer based electrodes.
Filiaciones:
Centro de Investigación en Ingeniería y Ciencias Aplicadas de la Universidad Autónoma del Estado de Morelos, Morelos, Cuernavaca, 62209, Mexico
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Morelos, Temixco, 62580, Mexico
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