Bifunctional Application of Viologen-MoS<sub>2</sub>-CNT/Polythiophene Device as Electrochromic Diode and Half-Wave Rectifier
Suchita Kandpal, Tanushree Ghosh, Chanchal Rani, Manushree Tanwar, Meenu Sharma, Sonam Rani, Devesh K. Pathak, Ravi Bhatia, I. Sameera, Jesumony Jayabalan, Rajesh Kumar
Abstract
nanoflower and MWCNTs are synthesized by one-step hydrothermal and pyrolysis techniques and well characterized by scanning electron microscopy (SEM), X-ray analysis (XRD), and Raman spectroscopy. Electrochromic properties of the device have been studied in detail to reveal an improvement in device performance in terms of faster speed and high coloration efficiency and color contrast. In situ bias-dependent Raman spectroscopy has been performed to understand the operation mechanism of the electrochromic diode which reveals (bi-)polaron formation as a result of dynamic doping eventually leading to color change. A half-wave rectifier has been realized from the electrochromic diode which rectifies an AC voltage of frequency 1 Hz or less making it suitable for low frequency operation. The study opens a new possibility to design and fabricate multipurpose frequency selective electrochromic rectifiers.