摘要
运用丝网印刷的方式在导电玻璃基底表面涂覆了聚(3,4-乙烯二氧噻吩)(PEDOT):聚苯乙烯磺酸盐混合物(PSS)薄膜,并采用稀H_2SO_4加甲醇混合溶液后处理的方式对其进行了改性.使用扫描电子显微镜(SEM)和原子力显微镜(AFM)观察处理前后薄膜的表面形貌及厚度的变化,对比了处理前后薄膜的电导率,并结合X射线衍射(XRD)和X射线光电子能谱(XPS)分析探讨了导致电导率变化的原因.最后,将PEDOT:PSS薄膜作为对电极组装了染料敏化太阳能电池(DSSC),运用电化学阻抗谱(EIS)研究了对电极的催化性能,并测试了DSSC的光伏性能.结果显示,经过后处理改性后,由于PSS被部分去除,PEDOT:PSS薄膜的表面形貌发生了显著改变,厚度变薄,粗糙度升高,电导率提升至原始的3倍以上,对I_3~–还原的催化活性升高,且组装的DSSC的性能也有了显著提高,光电转换效率由5.12%提升至6.64%.
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS) films were coated on fluorinedoped tin oxide(FTO) conductive glass substrates via facile screen printing,followed by a modification.The modification was realized through post-treatment,i.e.,immersing the as-printed films into a mixed solution consisting of diluted H_2SO_4 and methanol,and baking at 120 °C after 10 min of dipping.Scanning electron microscopy(SEM) and atomic force microscopy(AFM) were used to investigate the surface morphology and the thickness changes of the films before and after treating.Electrical conductivity of the pristine and that of the treated films were calculated and compared,using sheet resistance and thickness,and the result was discussed based on X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) analysis.Finally,PEDOT:PSS films were used as counter electrodes of dye-sensitized solar cells(DSSCs).The catalytic activity of the PEDOT:PSS films toward I_3~– reduction reaction was characterized by electrochemical impedance spectroscopy(EIS),and the photovoltaic performance of DSSCs assembled by the films was evaluated under the irradiation of simulated AM 1.5G condition.The results demonstrate that,the amorphous PEDOT:PSS films are uniformly coated on FTO substrates after screen printing,and the surface morphology of PEDOT:PSS experiences significant change after the modification by post-treatment,with significantly decreased thickness and slightly increased roughness.The electrical conductivity has been enhanced to more than three times of that in the pristine film,due to the partial removal of PSS rather than the improvement of crystallinity.The catalytic activity toward I_3~– reduction reaction is greatly enhanced,and the photovoltaic performance of the DSSCs assembled is also obviously improved,with the photo conversion efficiency increases from 5.12% to 6.64%.The increased PEDOT/PSS mass ratio,electrical conductivity and roughness of the PEDOT:PSS films after post-treatment is believed to be responsible for the improvedment of the photovoltaic performance of the DSSCs.
引文
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