Optical properties and conductivity of PEDOT:PSS films treated by polyethylenimine solution for organic solar cells |
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| Affiliation: | 1. National Engineering Laboratory for TFT-LCD Material and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai OE Chemicals, 200232, China;1. Department Enginyeria Electrònica, Universitat Politècnica de Catalunya, Jordi Girona 1-3, Barcelona 08034, Spain;2. Centre de Recerca en Nanoenginyeria (CrNE), Pascual Vila 15, Barcelona 08028, Spain;3. Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India;1. Department of Physics, University of Isfahan, Hezar Jerib, Isfahan, P.O. Box 81746-73441, Iran;2. Department of Physics, University of Zanjan, P.O. Box 45195-313, Zanjan, Iran;1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea;2. Department of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Republic of Korea |
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| Abstract: | We report on conductivity and optical property of three different types of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) films pristine PH1000 film (PH1000-p), with 5 wt.% ethylene glycol additive (PH1000-EG) and with sulfuric acid post-treatment (PH1000-SA)] before and after polyethylenimine (PEI) treatment. The PEI is found to decrease the conductivity of all the PEDOT:PSS films. The processing solvent of 2-methoxyethanol is found to significantly enhance the conductivity of PH1000-p from 1.1 up to 744 S/cm while the processing solvent of isopropanol or water does not change the conductivity of PH1000-p much. As for the optical properties, the PEI treatment slightly changes the transmittance and reflectance of PH1000-p and PH1000-EG films, while the PEI leads to an substantial increase of the absorptance in the spectral region of 400–1100 nm of the PH1000-SA films. Though the optical property and conductivity of the three different types of PEDOT:PSS films vary with the PEI treatment, the treated PEDOT:PSS films exhibit similar low work function. We demonstrate solar cells with a simple device structure of glass/low-WF PEDOT:PSS/P3HT:ICBA/high-WF PEDOT:PSS cells that exhibit good performance with open-circuit voltage of 0.82 V and fill factor up to 0.62 under 100 mW/cm2 white light illumination. |
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| Keywords: | PEDOT:PSS Polyethylenimine Conductivity Optical property Organic solar cells |
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