Methyl blue dyed polyethylene oxide films: Optical and electrochemical characterization and application as a single layer organic device

• A single layer organic device based on methyl blue dyed polyethylene oxide film was fabricated on ITO coated glass substrate and Ag as top electrode.
• The conductivity of the polymer was increased by two orders of magnitude for the highest concentration of dye in PEO.
• Electrochemical energy band gap value of the active layer used in the device is 2.62 eV with HOMO and LUMO values of 5.34 and 2.72 eV respectively.

A single layer organic device employing methyl blue (MB) dyed polyethylene oxide (PEO) film has been fabricated and studied. The cyclic voltammetry was used to estimate the redox potential and energy band diagram of the device. The polymer film with highest concentration of the dye in PEO (PMB2%) possessing highest conductivity exhibited energy band gap of 2.62 eV with HOMO and LUMO values of 5.34 and 2.72 eV respectively. Based on cyclic voltammetry data, the electron affinity, ionization potential and energy band diagram of the device are discussed.