Abstract
In this article we demonstrate that a migration of iodine species and chemical transformation in a moist environment induced by a voltage-biased Pt electrode is able to alter the color and degree of charge transfer in a layer of the 2D organic molecular metal (BEDO-TTF)2.4I3 [BEDO = bis(ethylenedioxy)tetrathiafulvalene] self-assembled at the surface of a polycarbonate film. These effects produce a reversible electrochromic behavior of the layer with low operating voltages and fast operation times. Adjuvant with electrochromism, this flexible material exhibits rectifying behavior whose I-V curves are dependent on the voltage sweep directions. These results open new possibilities for the design and fabrication of organic flexible materials for soft electrochromic and rectifying components. The easy working principle ensures reliability, low power consumption, and versatility through its implementation into simple devices. Such working principle has been confirmed by temperature dependent resistance measurements, X-Ray, EDX-SEM, and conducting-AFM studies.
Highlights
Wearable electronics, cell phones, smart windows, sensors, and wireless communication devices[1,2,3,4] need mechanically flexible electronic components with electrochromic[1,2,3] and rectifying diode properties.[5]
In particular we focus our interest on BL films with an active layer of metallic (001) oriented microcrystals of (BEDO-TTF)2.4I3 [BEDO-TTF = bis(ethylenedioxy) tetrathiafulvalene]27–30 that is directly grown on top of a thin polycarbonate substrate (Fig. 1a)
The formation of the metallic (001) oriented layers of (BEDO-TTF)2.4I3 on the BL film was confirmed by X-ray diffraction, low-frequency Raman spectroscopy, conducting AFM, and DC transport measurements
Summary
Cell phones, smart windows, sensors, and wireless communication devices[1,2,3,4] need mechanically flexible electronic components with electrochromic[1,2,3] and rectifying diode properties.[5]. The above mentioned facts stimulated us to develop organic flexible material with electrochromic and rectifying properties based on such conducting BL films. 1234567890():,; Fig. 1 (BEDO-TTF)2.4I3 bilayer film and measurement setup model.
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