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Effect of interface thickness on power conversion efficiency of polymer photovoltaic cells

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Abstract

We investigated the effect of the thicknesses of the interface layers (here, PEDOT:PSS and LiF) of polymer photovoltaic cells because variations in thickness strongly affect the power conversion efficiency (PCE). It was observed that the PCE rapidly increased with a PEDOT:PSS thickness of up to ∼2,000 rpm and rapidly decreased when the PEDOT:PSS was thicker than ∼2,000 rpm. A PCE of 6.648% was obtained at a specific PEDOT:PSS layer thickness of ∼2,000 rpm, about 41.5% (from 4.698 to 6.648%) higher than the PCE with no PEDOT:PSS layer. In addition, the PCE slightly increased with an LiF layer thickness of up to ∼0.5 nm and rapidly decreased when the LiF layer was thicker than ∼0.5 nm. The maximum PCE was obtained at the LiF layer thickness of ∼0.5 nm. In particular, the maximum values of PCE, Jsc, Voc, and FF were obtained at 6.827%, 15.74 mA/cm2, 0.665 V, and 0.652, respectively. The PCE increased 209.2% (from 2.028 to 6.827%), compared to the LiF layer thickness of ∼5 nm.

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  1. Jea-Gun Park

    Present address: Nano-SOI Process Laboratory, Hanyang University, 17, Haengdang-dong, Seongdong-gu, 133-791, Seoul, Republic of Korea

Authors and Affiliations

  1. Nano-SOI Process Laboratory, Hanyang University, 17, Haengdang-dong, Seongdong-gu, 133-791, Seoul, Republic of Korea

    Su-Hwan Lee, Ji-Heon Kim & Tae-Hun Shim

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  1. Su-Hwan Lee
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  2. Ji-Heon Kim
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Lee, SH., Kim, JH., Shim, TH. et al. Effect of interface thickness on power conversion efficiency of polymer photovoltaic cells. Electron. Mater. Lett. 5, 47–50 (2009). https://doi.org/10.3365/eml.2009.03.047

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