Kelvin probe force microscopy study on conjugated polymer/fullerene bulk heterojunction organic solar cells
Kelvin probe force microscopy study on conjugated polymer/fullerene bulk heterojunction organic solar cells
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DOI：
10.1021/nl048176c
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发表时间：
2005-02-01
期刊：
影响因子：
10.8
通讯作者：
Sariciftci, NS
中科院分区：
文献类型：
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作者：
Hoppe, H;Glatzel, T;Sariciftci, NS
我们对由MDMO-PPV/PCBM共混物组成的经典有机太阳能电池系统进行了全面的开尔文探针力显微镜(KPFM)研究。KPFM方法得到了纳米尺度的形貌信息和局域功函数信息。实验在黑暗中进行，或在442 nm的连续激光照射下进行。我们发现氯苯和甲苯共混膜表面的能级有明显的差异。结合高分辨率扫描电子显微镜(SEM)实验，我们能够解释KPFM的结果，并得出一些关于太阳能电池配置中电子向阴极传输的结论。结果表明，在太阳能电池器件结构中，甲苯浇铸薄膜的表面对电子向阴极的传播表现出一种形态受控的阻碍，这种阻碍通常被蒸发在薄膜的顶部。
We conducted a comprehensive Kelvin probe force microscopy (KPFM) study on a classical organic solar cell system consisting of MDMO-PPV/PCBM blends. The KPFM method yields the information of topography and local work function at the nanometer scale. Experiments were performed either in the dark or under cw laser illumination at 442 nm. We identified distinct differences in the energetics on the surface of chlorobenzene and toluene cast blend films. Together with high-resolution scanning electron microscopy (SEM) experiments we were able to interpret the KPFM results and to draw some conclusions for the electron transport toward the cathode in the solar cell configuration. The results suggest that surfaces of toluene cast films exhibit a morphologically controlled hindrance for electron propagation toward the cathode, which is usually evaporated on top of the films in the solar cell device configuration.