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利用压电喷墨印刷技术沉积了PEDOT/PSS有机导电薄膜,研究了退火温度和乙二醇掺杂对薄膜导电性能的影响。实验结果表明:未退火和退火温度为120,140,160℃时,薄膜表面平均粗糙度分别为8.15,4.10,3.36,2.66nm;乙二醇掺杂使导电激活能由未掺杂时的0.096eV减小为0.046eV;电导激活能减小表明PEDOT分子链从低电导率的卷曲构象向高电导率的伸展构象转变;此外,乙二醇掺杂促使PSS与PE-DOT/PSS分离,使团聚的PEDOT/PSS颗粒变小从而分散更均匀,降低了表面粗糙度。
PEDOT / PSS organic conductive thin films were deposited by piezoelectric ink jet printing technology. The effects of annealing temperature and ethylene glycol doping on the conductive properties of thin films were investigated. The experimental results show that the average surface roughness of the film is 8.15, 4.10, 3.36 and 2.66 nm when the un-annealed and annealed temperature is 120, 140 and 160 ℃, respectively. The ethylene glycol doping decreases the conductive activation energy from 0.096 eV 0.046eV. The decrease of conductance activation energy indicated that the PEDOT molecular chain changed from a low-conductivity crimp conformation to a high-conductivity transition conformation. In addition, ethylene glycol doping promoted the separation of PSS from PE-DOT / PSS, PSS particles become smaller to disperse more uniformly, reducing the surface roughness.