Estimation of Richardson Constant for Natural Organic dye Based Cells using Orange-lemon and Apple-green

Abstract

The Richardson constant is one of the most important parameters to analyze the current conduction process in the metal organic Schottky contact. But there are very few reports available on the estimation of effective Richardson constant for the natural dyes. In this work, we have estimated the values of effective Richardson constant for two different natural dyes namely Orange-Lemon and Apple-Green. A thin organic film of these herbal dyes was sandwiched in between Indium Tin Oxide-coated glass and a Copper plate by spin coating technique. The current-voltage-temperature response of the cells was investigated at a temperature interval of 303K to 333K using Keithley 2400 source meter. The effective Richardson constants for these dyes have been estimated which are 110 x 10-3 A/cm2K2, and 118 x 10-3 A/cm2K2 for OL and AG dye respectively, which is different from the conventional value of 120 A/cm2K2. These values will help us to study different electrical parameters for these natural dyes.