Influence of doped PEDOT:PSS on the performance of polymer solar cells

The influence of anode buffer layers of doped poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) on the performance of solar cells made from blends of poly(3-hexylthiophene) and [6,6]-phenyl-C61-buytyric acid methyl ester has been investigated. Different concentration of ethylene glycol were added into the PEDOT:PSS solution to increase its conductivity. The surface roughness of the doped PEDOT:PSS film was changed, which was examined by atomic force microscopy. The best doped device with a power conversion efficiency of 4.39% as compared to 3.41% for the pristine device has been achieved. The enhanced PEDOT:PSS conductivity improved the short circuit current and fill factor of the doped device. The almost constant open circuit voltage indicated the well-established ohmic contact between the anode and active layer irrespective of the doping of the PEDOT:PSS. The changed surface roughness of the doped PEDOT:PSS film did not correlate with the morphology of the consequent active layer and the resultant device performance.

The influence of doped poly(3, 4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) on the performance of solar cells made from blends of poly(3-hexylthiophene) and [6,6]-phenyl-C61-buytyric acid methyl ester has been investigated.Figure optionsDownload as PowerPoint slideHighlights
► The conductivity and surface roughness of the doped PEDOT:PSS were investigated.
► The influence of the doped PEDOT:PSS on device performance has been researched.
► The best device with a PCE of 4.39% and an FF of 70% has been achieved.
► The improved performance resulted from the increased PEDOT:PSS conductivity.
► The doped PEDOT:PSS morphology did not correlate with the device performance.