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Tetrathiafulvalene: effective organic anodic materials for WO3-based electrochromic devices.


ABSTRACT: Finding a new, effective anodic species is a challenge for achieving simpler low-voltage tungsten trioxide (WO3)-based electrochromic devices (ECDs). In this work, we utilize tetrathiafulvalene (TTF) and demonstrate its reversible redox behaviors as an electrolyte-soluble anodic species. The concentration of TTF in the electrolyte is varied to optimize device performance. When the TTF concentration is low (0.01 M), a smaller maximum transmittance difference (ΔT max ∼ 34.2%) and coloration efficiency (η ∼ 59.6 cm2 C-1) are measured. Although a better performance of ΔT max ∼ 93.7% and η ∼ 74.5 cm2 C-1 is achieved at 0.05 M TTF, the colored state could no longer return to its original form. We conclude that 0.03 M of TTF is the appropriate concentration for high-performance WO3 ECDs with high optical contrast and reversible EC behaviors. The irreversible EC transition at high concentrations of TTF is attributed to the agglomeration of TTF molecules.

SUBMITTER: Kim YM 

PROVIDER: S-EPMC9065372 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Tetrathiafulvalene: effective organic anodic materials for WO<sub>3</sub>-based electrochromic devices.

Kim Yong Min YM   Li Xinlin X   Kim Keon-Woo KW   Kim Se Hyun SH   Moon Hong Chul HC  

RSC advances 20190620 34


Finding a new, effective anodic species is a challenge for achieving simpler low-voltage tungsten trioxide (WO<sub>3</sub>)-based electrochromic devices (ECDs). In this work, we utilize tetrathiafulvalene (TTF) and demonstrate its reversible redox behaviors as an electrolyte-soluble anodic species. The concentration of TTF in the electrolyte is varied to optimize device performance. When the TTF concentration is low (0.01 M), a smaller maximum transmittance difference (Δ<i>T</i> <sub>max</sub> ∼  ...[more]

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