Estimation of activation energy of Tartrazine dye based natural organic device

• Main Authors: Karan, Arnab Kanti, Sahoo, Dipankar, Sen, Sudipta, Rakshit, Subhra, Bhunia, Swapan, Manik, N. B.
• Format: Conference Proceeding
• Language: English
• Subjects: Absorption spectroscopy; Activation energy; Dyes; Electrical resistivity; Frequency ranges; Heat treating; High temperature; Low temperature
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0206755

The electrical conductivity of the natural chemical molecule Tartrazine dye is investigated in this publication. This dye has a good electrical conductivity, prompting us to investigate the AC and DC conduction mechanisms of this dye-based device further. Absorption spectroscopy was used to determine the optical band gap of this dye, which was determined to be 2.58eV. Measurement of DC electrical conductivity of this dye was done with an impedance spectrometer from the temperature range 303 K (30° C) to 373 K (100° C). The dye shows a conductivity of 5.07 × 10−8 (n-m)−1 for low temperature region and 1.22 × 10−8(n-m)−1 for high temperature region. The activation energy was measured using the well-known Arrhenius equation having values 1.685 eV and 0.946 eV for low and high temperature regions respectively. AC conductivity also carried out between the frequency range 500Hz to 100KHz with the temperature range 303 K (30° C) to 373 K (100° C). Activation energy at AC field was found to be 0.291 eV. We can see that the value of DC conductivity is higher with respect to AC conductivity at high temperature region and the activation energy in DC field is higher with respect to the AC field. Barrier hooping mechanism is an evidence for the reduction of the activation energy in AC field.