原子力显微镜几种成像模式在聚合物太阳能电池材料表征中的应用

Application of Some Atomic Force Microscopic Imaging Mode in Observation of Polymer Solar Cells

聚合物太阳能电池材料表面柔软、粘弹性较强,很容易粘滞探针,从而影响到原子力显微镜的成像质量。本文通过比较轻敲模式、智能成像以及快速扫描模式三种原子力显微镜成像模式对聚合物太阳能电池材料的形貌和相位成像情况,分析探讨了探针型号的选择、作用力控制、扫描速率等参数对成像清晰度和准确性的影响。通过比较可知,弹性系数较小及具有反射镀层的探针均有利于聚合物类样品的检测;控制探针与样品之间较小作用力也有利于获得丰富的形貌信息;另外,扫描速率太高不利于获得细节形貌信息,应将扫描速率控制在一定范围内。因此,选择合适的成像条件和设置适当的扫描参数对原子力显微镜成功应用于分析表征聚合物太阳能电池材料样品具有十分重要的意义。

The surface of polymer solar cells is soft and sticky,which affect the scan of AFM tip seriously and influence AFM observation.In this study,tapping mode,ScanAsyst mode and FastScan mode were used to analyze the morphology and phase separation of polymer solar cells.And the effects of scanning parameters,such as types of tips,control of interaction force between sample and tip and scan rate were discussed.Results demonstrate that AFM tips with low elastic coefficient and reflective coating are good for the detection of polymer solar cells.And it is very helpful to control low interaction force.In addition,high scanning rate is not favorable for getting good morphologic image,thus the scanning rate should be controlled.It is important to select appropriate parameters and imaging mode in characterization of polymer solar cells.