中文摘要：

通过逐层旋涂的方法,制备了P3HT（poly（3-hexylthiophene））与PMMA（poly（methylmethacrylate））双层器件,并与二者的共混溶液制备的器件进行了性能对比。利用扫描电镜（SEM）表征了双层器件的横截面形貌;利用电流-电压（I-V）以及电流-读取次数（I-t）测试,测量了两种器件的开关比以及持续时间特性。其中,双层器件具有更好的开关比,可达1×10~3,同时反复读写测试表明器件性能非常稳定。为了解释电双稳现象产生的机理,对双层结构器件的电流-电压曲线进行了线性拟合,利用器件的能级图进行分析,得出了电荷在器件中的传输过程。研究结果表明,可以通过电荷俘获释放理论解释P3HT/PMMA双层器件电双稳特性产生的机理。

英文摘要：

P3HT / PMMA bilayer device was fabricated through layer by layer spin-coating method and the device performance was greatly enhanced comparing with P3HT and PMMA single layer device. SEM image was taken to study the cross-section morphology of the bilayer film. The currentvoltage（ I-V） and current-repeatable times（ I-t） measurements were taken to investigate the performance of the devices. The bilayer one has a better ON / OFF ratio about 1 × 10~3 and the device is quite stable. The fitting of I-V curves was utilized to analyze the charge transport process with the help of the diagram of the energy bands. The results show that the charge trapping-detrapping theory can be used to explain the operating mechanism of the bilayer device.