A new standard method to calculate electrochromic switching time

Sofiane Hassab (1) , D. Eric Shen (2) , Anna Ӧsterholm (2) , Mathias da Rocha (3) , Giljoo Song (3) , Yolanda Alesanco (4) , Ana Viñuales (4) , Aline Rougier (3) , John C. Reynolds (2) , Javier Padilla (1)

1 Department of Applied Physics
2 School of Chemistry and Biochemistry, School of Materials Science and Engineering
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
4 CIDETEC

The switching time is one of the key parameters used to assess the performance of an electrochromic material or device. In spite of its importance, there is currently no standard for how this parameter is defined, and as a result, it is difficult to compare switching time data between different research groups, and to quantify and assess reported improvements. We propose a standard method for reporting electrochromic switching times, based on straightforward experimental fittings resulting in an analytical expression that can directly correlate obtainable optical contrast values with their corresponding switching times. This analytical expression makes it possible to unambiguously define the performance of an electrochromic material or device using two parameters: a full-switch contrast and a time constant.

Mots clés: Electrochromic switching time; Time constant; Coloration time; Bleaching time; Switching speed

Domaines: Matériaux

Sofiane Hassab, D. Eric Shen, Anna Ӧsterholm, Mathias da Rocha, Giljoo Song, et al.. A new standard method to calculate electrochromic switching time. Solar Energy Materials and Solar Cells, 2018, 185, pp.54-60. ⟨10.1016/j.solmat.2018.04.031⟩. ⟨hal-01812054⟩