Complementary hybrid electrodes for high contrast electrochromic devices with fast response.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31653835.
- Also identified by DOI 10.1038/s41467-019-12617-4 and PMC identifier 6814761.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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.