Electrical and photoelectrical properties of organic photovoltaic cells based on polymer blends ITO/PEDOT/P3HT: PCBM (1:1)

摘要

Photovoltaic structures based on poly(3-hexylthiophene) (P3HT), 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C-61 (PCBM) polymers and P3HT:PCBM(1:1) polymers blend, respectively, were prepared by spin coating technique, using optical glass substrates covered with 30 nm thick ITO. The current-voltage (I-V) characteristics, in dark and illumination through ITO electrode of the ITO/PEDOT/P3HT/Al, ITO/PEDOT/PCBM/Al and ITO/PEDOT/P3HT: PCBM (1:1)/Al, structures were measured. Their non-linearity and asymmetry were explained on the base of electrode/organic semiconductor interface behavior. The measured action spectra of the cells revealed the features also observed in absorption spectra of the component polymers or the blend. A fill factor (FF) of 28%, higher than in the case of single layer structures was measured experimentally for the blend structures. The power conversion efficiency on 0.44%, of the as prepared blend structures was higher, too, than those of the single layer structures based on the ordinary P3HT and PCBM layer, respectively. The fourth quadrant parameters of the blend structures, determined in monochromatic light, change in time with respect of their values obtained on as prepared samples.