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Physical, chemical, theoretical aspects of conducting polymer electrochromics in the visible, IR and microwave regions

Chandrasekhar, P and Zay, BJ and McQueeney, T and Birur, GC and Sitaram, V and Menon, R and Coviello, M and Elsenbaumer, RL (2005) Physical, chemical, theoretical aspects of conducting polymer electrochromics in the visible, IR and microwave regions. In: Synthetic Metals, 155 (3). pp. 623-627.

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Abstract

Conducting polymers (CPs) display strong electrochromism across the visible, near-IR (NIR), IR and even microwave spectral regions. Applications range from military to space. However, a fundamental understanding of the phenomena behind this electrochromism, the charge carrier(s) responsible, and the relation of nanoscopic morphology and electrochemical properties to the electrochromism, still remains lacking. This paper takes a first step at such a correlation, mining a wealth of data accumulated over the course of many years by our group. Expected findings are that certain population states contribute predominantly to certain spectral regions (e.g. bipolaron states to the IR, the valence band to the visible and other mid-gap states to the microwave). Among more specific findings, a prominent 7 \mu m (0.16 eV) peak in MR devices is ascribed to bipolarons, whilst a low-energy transition at 0.054 eV is ascribed to inter/intra-chain transitions. Other findings point to the potential design of very broad-band electrochromic systems encompassing the visible through microwave regions.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Conducting; Polymer; Infrared; Electrochromic; Spacecraft
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 23 Jan 2006
Last Modified: 04 Jan 2013 11:08
URI: http://eprints.iisc.ernet.in/id/eprint/5199

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