Quantitative Characterization of Optical Coupling in Nanoporous ZnO–WO₃ and ZnO–PEDOT Composite Electrodeposited Gratings Using Electrodiffraction Measurements
2018
Fung, Han Wai Millie | So, Seulgi | Kartub, Kellen | Corn, Robert M.
To quantitatively characterize the optical coupling between ZnO (a high refractive index but nonabsorptive material) and an electrochromic material (either tungsten oxide (WO₃) or poly(3,4-ethylenedioxythiophene) (PEDOT)), electrodiffractive and electrochromic properties were investigated from a novel two-component composite nanostructured electrodeposited grating that incorporated both ZnO and either WO₃ or PEDOT. The sequential electrodeposition of these two materials through a photopatterned photoresist layer onto a fluorine-doped tin oxide (FTO)-coated glass substrate created a grating structure that exhibited optical diffraction that could be modulated electrochemically. SEM images of the electrochromic gratings revealed that the ZnO electrodeposition created a high surface area nanostructured thin film. The nanostructured ZnO is nonabsorbing, but its high refractive index and large surface area redirect light into the electrochromic grating and create a 4-fold enhancement in the grating’s electrodiffractive response.
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