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Complementary hybrid electrodes for high contrast electrochromic devices with fast response

Fast switching ‘transparent-to-black’ electrochromic devices are currently under investigation as potential candidates in modern applications like e-papers or with additional functionality as ultracompact iris or switchable neutral filter in camera systems. However, recent electrochromic devices sho...

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Detalles Bibliográficos
Autores principales: Kortz, Carsten, Hein, Alexander, Ciobanu, Marius, Walder, Lorenz, Oesterschulze, Egbert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814761/
https://www.ncbi.nlm.nih.gov/pubmed/31653835
http://dx.doi.org/10.1038/s41467-019-12617-4
Descripción
Sumario:Fast switching ‘transparent-to-black’ electrochromic devices are currently under investigation as potential candidates in modern applications like e-papers or with additional functionality as ultracompact iris or switchable neutral filter in camera systems. However, recent electrochromic devices show either a lack of contrast or slow response times. To overcome these deficiencies we focus on a careful material composition of the colouring hybrid electrodes in our device. We have established a nanoporous Sb-doped SnO[Formula: see text] electrode as supporting electrode for chemisorbed electrochromic tetraphenylbenzidine molecules due to its good conductivity in the redox potential range of the molecule. This hybrid electrode was combined with a modified nanoporous TiO[Formula: see text] / viologen electrode to realize a high performance, complementary electrochromic device. Fast switching time constants of 0.5 s and concurrently high change in optical density [Formula: see text] OD = 2.04 at 605 nm confirm our successful concept. The achieved colouration efficiency of 440 cm[Formula: see text] C[Formula: see text] exceeds every high contrast device presented so far.