Nafion-Modified PEDOT:PSS/c-Si Solar Cells

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Nafion-Modified PEDOT:PSS/c-Si Solar Cells The 77th JSAP Autumn Meeting 15p-P13-2 Nafion-Modified PEDOT:PSS/c-Si Solar Cells Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan Qiming Liu, Jaker Hossain, Takuya Miura, Koji Kasahara, Daisuke Harada, Ryo Ishikawa, Keiji Ueno, and Hajime Shirai We demonstrate the chemistry of amphiphilic perfluorosulfonic copolymer Nafion coated conductive poly(3,4-ethyelenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and its effect on the photovoltaic performance of PEDOT:PSS/c-Si heterojunction solar cells. Solution-processed Nafion-coated PEDOT:PSS/c-Si heterojunction solar cells exhibit a power conversion efficiency of 14.0% with better stability for light soaking rather than that of the pristine PEDOT:PSS/c-Si device by adjusting the layer thickness of Nafion. These results originate from the chemical stability of fluorocarbon backbone of Nafion, diffusivity of silver paste into Nafion and contact with PEDOT:PSS, and Nafion as an antireflection layer. Methods and Results Characteristics: SE, XPS, SEM, Raman Highly hydrophobic fluorocarbon backbone (Left) Optical model used for the spectra analysis including best fitted results. (Right) The n and k spectra of bulk component of bottom PEDOT:PSS layer, PEDOT:PSS-Nafion intermixing layer, and top Nafion layer, respectively of a typical 2wt% Nafion-coated PEDOT:PSS thin films. Ag Nafion modified PEDOT:PSS InGa C-Si Hydrophilic -SO3- Device Schematic Molecular Structure PSS PEDOT Nafion Modified (a) Depth profile of XPS S(2p) core level spectra of 2 wt% Nafion-coated PEDOT:PSS films. (b) Raman spectra of Nafion-coated PEDOT:PSS thin films with different Nafion concentrations. (c,d) Cross sectional SEM images of Nafion/PEDOT:PSS/c-Si and Ag/Nafion/PEDOT:PSS/c-Si solar cell structures. (Left)J-V curves of PEDOT:PSS/c-Si heterojunction solar cells with and without Nafion coating. (Right)J-V curves of Nafion-doped PEDOT:PSS/ c-Si heterojunction solar cells with different concentrations. (a) (b) Quinoid Benzoid Stability of the J-V curves of (Left) Pristine and (Right) 2wt% Nafion-coated PEDOT:PSS/c-Si heterojunction solar cells for light soaking under AM1.5 simulated solar light exposure. Conclusions: The photovoltaic performance of Nafion modified PEDOT:PSS/c-Si devices exhibit a higher efficiency of 14.0% with increasing Jsc up to 32.7 mA/cm2 and an improved stability for light soaking. These findings originate from following contributions: 1) Increased carrier mobility due to the extension of π-conjugation of PEDOT, 2) The resistance of the moisture and impurity due to Nafion layer, 3) Nafion over layer acts as an antireflection layer and 4) Silver paste as a top grid electrode diffuse and/or preferentially dissolved with Nafion, resulting in a good contact with underneath PEDOT:PSS. Acknowledgements: Q. Liu appreciates the financial support by the Sasakawa Scientific Research Grant.