Tuning of series resistance by reducing the trap energy of methyl red dye-based organic devices in the presence of ZnO nanoparticles

In this work, we have measured the Rs of methyl red (MR) dye-based organic device in the absence and presence of ZnO nanoparticles and also observed the effect of trap energy (Ec) on Rs in the presence of this nanoparticles. The value of Rs is measured by the Cheung-Cheung method and the obtained value is verified by using H(I)-I plot. The extracted value of Rs using these two methods shows uniformity with each other. It has been observed that by incorporating ZnO, trap energy is reduced from 0.098 eV to 0.056 eV. The extracted values of Rs are about 7.065 MΩ and 0.964 MΩ for only MR dye-based device and MR with ZnO organic device, respectively. It can be said that lowering of trap energy in the presence of ZnO reduces the device Rs which enhances the flow of free charge carriers and improve the device performance.