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Yongju Park,Seunguk Noh,이창희,Donggu Lee,Jun Young Kim 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
We analyzed the electrical characteristics of polymer solar cells with different buffer layers between the anode and the active layer. The current-voltage characteristics of the solar cells were measured in the temperature range from 200 K to 350 K at illumination intensities from 1 to 100 mW/cm^2. Devices structure with ITO/buffer layer/poly (3-hexylthiophene) (P3HT): [6,6]-phenyl-C_61-butyric acid methyl ester (PCBM)/LiF/Al - buffer layer being molybdenum oxide (MoO_3) or poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) - showed different electronic transport behaviors with temperature change. A strong temperature dependence of short circuit current density of ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al solar cells indicates that the device is limited by the transport properties of the hole injection layer, PEDOT:PSS. A thermally - activated transport of photo - generated charge carriers, influenced by recombination with shallow traps at the interface, describes the variation of the photo current.