Study on doping temperature of iodine in MEH-PPV: I-MWCNTs organic solar cell

The performance of nanocomposited poly [2-methoxy-5-(2’-ethylhexyloxy)-(p-phenylene vinylene)] (MEH-PPV) and iodine doped multiwall carbon nanotube(MWCNT) for organic solar cell application were investigated. 120 mg of MWCNTs was first doped with 1 gram of iodine using thermal chemical vapour deposition method (CVD) with temperature varied at 90, 100, 110, 120, 130 and 140⁰C. Then, 80mg of MEH-PPV was stirred for 48 hours with tetrahydrofuran (THF). Next, the CNT was added to the solution to form nanocomposited MEH-PPV: I-MWCNT solution. The solution was then deposited on ITO using spin-coating method. The current density – voltage (J-V) were measured in dark and under illumination using solar simulator. Optical properties such as absorbance and transmittance were measured using UV-Vis Spectrophotometer. For physical properties, the characterization was done using Field Emission Scanning Electron Microscopy (FESEM) and Atomic Force Microscope (AFM). From the I-V curve characteristic, thin film with doping temperature of 100⁰C gives the best result considering some response it gives towards light. In optical properties, the thin film also gives out the 0.45 unit of absorption spectra which is the highest value among other temperature.