聚噻吩/弹性体基可拉伸半导体薄膜的结晶行为及拉伸性能关系研究

Conjugated polymer embedded in in an elastomeric matrix to be prepared as stretchable organic semiconducting thin film are hot research topic in recently two years. The multi-scale structures of conjugated polymer in elastomeric matrix directly influence the stretching and conducting properties of devices. In this project, the blending polymer of polythiophene/elastomer is prepared. Three processes including solution crystallization process, solvent evaporation process, substrate choosing are carefully controlled in order to control the multi-scale structures of polythiophene/elastomer blends. Moreover, the changes of stretching and conducting properties in the stretching process are also monitored. The multi-scale structure and morphology of polythiophene and their changes in the stretching process are characterized by using polarized optical and atomic force microscopy, infrared and UV-visible spectroscopy, X-ray and light scattering connected with Tensile Instrument. The aim of this project is to: (1) identify the effect of glass transition temperature, crystallization and orientation behavior, phase transition condition on the stretching and conducting properties of devices; (2) build the relationship between multi-scale structures and stretching properties of blending polymer. Through the research, the useful theory guidance can be provided for the stretchable organic semiconducting thin film devices studies.

共轭导电聚合物与柔性聚合物共混掺杂法制备可拉伸的半导体器件成为柔性电子器件研究领域的一个新热点。半导体共轭聚合物在共混薄膜形成的多层次结构将直接影响柔性共混薄膜的力学及导电性能。本项目拟通过溶液共混的方法制备聚噻吩和聚合物弹性体的共混薄膜。通过控制溶液结晶，挥发过程，基底界面性质等过程精准控制聚噻吩在柔性基质中的多层次形态及结构并追踪拉伸过程中柔性共混薄膜的力学性能及电学性能的变化。将用小角X光散射及光散射，紫外可见光谱仪等分析方法表征溶液中聚噻吩的有序结构及形态。同时借助张力仪联用的偏光显微镜，红外， X射线衍射，紫外可见光谱仪等表征静态及拉伸过程中共混薄膜的多层次结构及拉伸性能的变化。明确聚噻吩玻璃化转变行为，结晶和取向行为，相分离状态对柔性半导体共混薄膜力学性能和导电性能的影响规律；建立共混薄膜膜多层次结构和拉伸性能的相互对应关系。为优化可拉伸半导体器件的性能提供行之有效的理论指导

共轭导电聚合物与柔性聚合物共混掺杂法制备可拉伸的半导体器件成为柔性电子器件研究领域的一个新热点。半导体共轭聚合物在共混薄膜中形成的多层次结构将直接影响柔性共混薄膜的力学及导电性能。本项目以调控共轭导电聚合物的的取向结构为核心，深入系统研究了柔性基底上取向半导体结构在拉伸过程中的结构以及电学性能演变规律。首先通过溶液旋涂、溶液提拉等方法制备了取向的聚噻吩薄膜，辅助于溶剂退火、热退火、基底界面性质控制等方法精准控制了聚噻吩等几种典型导电聚合物的取向结构和形态。并利用偏光显微镜，红外，X射线衍射，紫外可见光谱仪等分析方法表征了聚噻吩等导电聚合物的有序结构、形态以及各向异性的光学性质；明确了精准制备取向导电聚合物多层次凝聚态结构的典型方法。将精准控制了凝聚态结构的导电聚合物制备在柔性基底上，并追踪了拉伸过程中柔性薄膜上导电层形态、结构、光学性能及电学性能的变化；明确了导电聚合物结晶和取向行为对柔性半导体薄膜导电性能的影响规律；为优化可拉伸半导体器件的性能提供行之有效的理论指导。