以導電性高分子為固態電解質之鋁電解電容器具有高頻特性佳、溫度穩定性高、壽命長及可小型化等優點，但由於電解質與載體間的附著度不佳，產生所謂的界面損失，以及高分子電解質的導電度低，使得電容器的內電阻提高，而降低電容器的工作效率。為製備良好的高分子鋁電解電容器，本研究採用四種策略來改善上述缺點：(1)利用不同的修飾分子修飾氧化鋁載體，藉由氧化鋁的修飾來提高導電高分子與氧化鋁之間的附著度；(2) 藉由苯胺聚合時加入不同比例的有機溶劑，減緩聚合速率使所沈積的聚苯胺膜較緻密，降低電容元件之阻抗；(3)利用不同的酸摻雜高分子膜，提升高分子膜的導電度，降低電容元件之阻抗；(4)使用多次聚合來提高高分子在載體上的披覆率以提高電容元件之電容量。實驗結果發現，介電層以有機羧酸分子或有機磷酸分子修飾可改善電容器之界面阻抗，進而降低其DF值。在聚合時加入少許的有機溶劑(乙醇)，使聚合出之聚苯胺膜較緻密，亦可降低其DF值。多次聚合可有效的增進聚苯胺於載體上的披覆率，可使元件之電容量有明顯的提升。 Aluminum electrolyte capacitors with conducting polymer as a solid electrolyte has the advantages of high frequency characteristic, high thermal stability, long life-time, and miniaturizeable potentials. However, due to the poor adhesion between electrolyte and substrate, the so-call interface loss occurs. Moreover, the relatively low conductivity of the conducting polymer cause the higher internal resistance, affects the performance of the capacitor. In this study, we propose four methods to solve these problems. They are: (1) Modified the dielectric layer with organic compound to improve the adhesion between polymer and dielectric layer; (2) Adding organic solvent to decrease the rate of polymerization. Therefore, the denser polymer film was formed, the resistance of the capacitor will be reduced; (3) Choosing proper doping acid to increase the conductivity of polyaniline, reduce the resistance of the capacitor; (4) Using multiple-step polymerization/deposition procedure to increase the coverage of the polyaniline films, increasing the capacitance of the capacitor. The results showed that the modification of dielectric layer with organic carboxylic acid or organic phosphobic acid can improve the adhesion between polymer electrolyte and dielectric layer, decreasing the internal resistance and DF value of the capacitor. Adding small amount of organic solvent (alcohol) during the polymerization/deposition process can also decrease the DF value of the capacitor. Furthermore, using multiple-step polymerization/deposition procedure can improve the coverage of the polyaniline films therefore, increase the capacity significantly.
