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An Inverted Sandwich Electrochromic Device Architecture Does Not Require Optically Transparent Electrodes
Author(s) -
Rozman Martin,
Gaberšček Miran,
Marolt Gregor,
Bren Urban,
Lukšič Miha
Publication year - 2019
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201900389
Subject(s) - electrochromism , materials science , electrode , electrolyte , optoelectronics , electrolysis , electrochromic devices , chemistry
All currently known sandwich‐type electrochromic devices (ECDs) require at least one optically transparent electrode (OTE) for their operation. Here, it is demonstrated that this requirement is conceptually redundant. The so‐called inverted sandwich ECD architecture is introduced, with its principal components being: two solid optically nontransparent electrodes (high electrical conductivity material), an insulator that prevents a short‐circuit between the electrodes, and an electrochromic mixture applied on a solid carrier. The modus operandi of the present proof‐of‐concept solution‐phase double‐sided ECD is a reversible color change of the indicator dye caused by the variations in pH of the water‐based electrolyte solution due to electrolysis. Application of the inverted sandwich topology to make electrochromic tapes is given.