Abstract
Various treatments on the PEDOT:PSS films were carried out to investigate it’s influence on the conductivity, morphology, transmittance and the corresponding impact of the performance of the organic photovoltaic devices based on the PCPDTBT:PCBM and P3HT:PCBM blends. These processing including doping PEDOT:PSS with DMF and ME solvents and exposing these films to the vapor of DMF and ME solvents, separately. A considerable enhancement of the conductivity and transmittance of PEDOT:PSS was observed after doping solvent into the PEDOT;PSS solution followed by solvent treatment through exposing these films to solvents environment. The best organic PV doped devices based on either PCPDTBT:PCBM or based on P3HT:PCBM with power conversion efficiency were 2.93% compared to 1.87% for the pristine PV devices or 2.79% compared to 1.77% for the pristine devices, respectively. The conductivity improvement was highly influenced by solvent treatment.
Highlights
Poly(ethylene-3,4-dioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) is widely used in molecular electronic devices as a transparent anode with relatively high work function and as a smoothing coating layer of rough inorganic conducting surfaces[1]
All the PEDOT:PSS thin films show good transmittance spectra in the range from 400 to 800 nm which could be attributed to the colorless nature of the PSS, the optical absorption in PEDOT:PSS mainly originates from the presence of PEDOT [27]
This intensity difference cannot be attributed to the loss of PSS from the PEDOT:PSS thin films, because all the solvents were removed from the PEDOT:PSS films by heating and the treated PEDOT:PSS films were not rinsed with any solvent
Summary
Poly(ethylene-3,4-dioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) is widely used in molecular electronic devices as a transparent anode with relatively high work function and as a smoothing coating layer of rough inorganic conducting surfaces (normally indium–tin oxides)[1]. Organic solar cell (OSC) devices, fabricated from the blends of Poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]:[6,6]-phenyl-C71-butyric acid methyl esters (PCDTBT:PC71BM) bulk heterojunction systems has relatively good photovoltaic (PV) properties compared to other bulk heterojunction OSCs [21]. Two strategies were employed the first is doping PEDOT:PSS with either ME or DMF and the second is treated the doped PEDOT:PSS layer with solvent treatment (using the same solvent, i.e. using DMF solvents treatment for DMF-doped PEDOT:PSS layer) This treatment has direct impact on the electrical conductivity, morphology, optical other properties of PEDOT:PSS layer and on the organic solar cells performance. Thiophenediyl-2,1,3-benzothiadiazole- 4,7-diyl-2,5-thiophenediyl (PCDTBT), Poly (3-hexathiophine-2,5-diyl) (P3HT) and [6,6]-Phenyl C61butyric acid methyl ester (PCBM), were purchased from Sigma Aldrich
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