Effects of Methanol Addition on the Structural, Optical, and Electrical Properties of PEDOT:PSS Films
Keywords:
PEDOT:PSS, Methanol, Amorphous, Electrical property, Sheet resistanceAbstract
PEDOT:PSS is a highly potential transparent conductive material for applications in electronic devices and solar cells. This study aims to investigate the effects of methanol on the structural, optical, and electrical properties of PEDOT:PSS films by adding methanol at ratios of 1:1, 1:2, 1:4, and 1:8. The PEDOT:PSS films with methanol addition were coated onto fluorine-doped tin oxide (FTO) conductive glass, and their characteristics were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis) spectroscopy, and a four-point probe method to analyze crystal structure, functional groups, optical transmittance, and sheet resistance, respectively. The results revealed that the PEDOT:PSS films exhibited no distinct crystallographic peaks, indicating that the structure remained amorphous. The functional group analysis confirmed the presence of key vibrational signals corresponding to C-H, C=O, C-C, C-S, and SO42-, which are characteristic of PEDOT and PSS. Meanwhile, the average optical transmittance in the visible light range remained approximately 75% across all methanol ratios, suggesting that methanol incorporation did not significantly alter the structural and optical properties. However, the total sheet resistance was significantly reduced, with a minimum value of 6.69±0.04 /sq at a PEDOT:PSS-to-methanol ratio of 1:4. Therefore, optimizing the methanol ratio is a crucial factor in enhancing the electrical properties of PEDOT:PSS films.
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