Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 2, Issue 9, Pages 2994-3000Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.0c00606
Keywords
electrochromic; organic electronics; solid-state device; ethyl viologen; color modulation; phenothiazine
Funding
- Council of Scientific and Industrial Research, New Delhi [CSIR 01(2934)/18/EMR-II]
- Science Engineering Research Board (SERB), New Delhi [CRG/2018/000032]
- SERB, Govt. of India [CRG/2019/000371]
- Council of Scientific and Industrial Research (CSIR) [09/1022(0039)/2017-EMR-I]
- MHRD
- Department of Science and Technology (DST), Govt. of India
- DST, Govt. of India [SR/FST/PSI-225/2016]
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Electron-donating properties of 3-ferrocenylethynyl-10-propyl-10H-phenothiazine (FPP) has been studied to be used as an efficient counter ion for application in a viologen-based organic electrochromic device to facilitate an efficient all-organic electrochromic device. The FPP molecule, when used as a counter ion with viologen, improves the switching time to less than half a second and exhibits lower operation voltage of similar to 1 V and excellent stability for longer than 1800 s with a negligible amount of absorption loss. Spectroscopic and electrochemical measurement techniques have been used to understand the mechanism of bias-induced enhanced performance of the FPP-viologen-based solid-state electrochromic device. The device does not contain any liquid electrolytic medium to support its switching behavior and can also be fabricated on a plastic substrate for realization of a flexible all-organic electrochromic device. The viologen-FPP electrochromic device showed an optical contrast of more than 55% with a bias of 0 to 1 V when switched between OFF- (transparent) and ON- (blue) states. An excellent value of coloration efficiency of 460 cm(2)/C is obtained with a simple all-solid device geometry arrangement, making it the most efficient solid-state electrochromic device in the viologen family of devices.
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