Influence of surface roughness on the efficiency of a flexible organic solar cell
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Organic solar cells (OSCs) without an over-coating layer, consisting of a silver nanowire (AgNW) transparent electrode, apoly(3,4-ethylenedioxythiphene):poly (styrenesulfonate) (PEDOT:PSS) layer, a poly(3-hexylthiophene-2,5-diyl):the [6,6]-phenylC61 butyric acid methyl ester (P3HT:PCBM) active layer, a LiF/Al electron collecting, and a top electrode, were successfullyfabricated in order to investigate the effect of surface roughness on the efficiency of OSCs. The AgNW transparent electrodeon acryl resin coated polyethylene terephthalate (PET) film was prepared through the filtration/transfer method. Sheetresistance of 30 Ω-1 and surface roughness of 10.5 nm were detected. After coating the PEDOT:PSS hole transfer layer andthe P3HT:PCBM active layer at 1000 rpm on the AgNW/PET transparent electrode, the surface roughness was reduceddramatically. However, open circuit voltage, short circuit current density, fill factor, and power conversion efficiency decreasedas the coating speed was raised during the formation of the PEDOT:PSS layer and the P3HT:PCBM active layer due to thedeterioration of the surface roughness. The surface roughness was determined to be crucial for the output performance ofOSCs.
Abstract
Organic solar cells (OSCs) without an over-coating layer, consisting of a silver nanowire (AgNW) transparent electrode, apoly(3,4-ethylenedioxythiphene):poly (styrenesulfonate) (PEDOT:PSS) layer, a poly(3-hexylthiophene-2,5-diyl):the [6,6]-phenylC61 butyric acid methyl ester (P3HT:PCBM) active layer, a LiF/Al electron collecting, and a top electrode, were successfullyfabricated in order to investigate the effect of surface roughness on the efficiency of OSCs. The AgNW transparent electrodeon acryl resin coated polyethylene terephthalate (PET) film was prepared through the filtration/transfer method. Sheetresistance of 30 Ω-1 and surface roughness of 10.5 nm were detected. After coating the PEDOT:PSS hole transfer layer andthe P3HT:PCBM active layer at 1000 rpm on the AgNW/PET transparent electrode, the surface roughness was reduceddramatically. However, open circuit voltage, short circuit current density, fill factor, and power conversion efficiency decreasedas the coating speed was raised during the formation of the PEDOT:PSS layer and the P3HT:PCBM active layer due to thedeterioration of the surface roughness. The surface roughness was determined to be crucial for the output performance ofOSCs.
참고문헌 (18)
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