Minority carrier dynamics in solar cell materials investigated by photo-assisted KFM

我们在多晶和微晶太阳能电池材料上应用了我们最初开发的光助KFM和AFM光热光谱，以及扫描隧道光谱，以便非常局域地研究它们的各种性质。结果，我们成功地发现了晶界附近能带分布的一些特征，少数载流子的扩散长度、寿命和迁移率等动力学及其空间分布，以及光激发载流子的复合过程。

We have applied the photo-assisted KFM and the AFM photo-thermal spectroscopy, which we have originally developed, as well as the scanning tunneling spectroscopy on multi- and micro-crystalline solar cell materials in order to investigate their various properties very locally. As a result, we successfully found some specific features of the band profile around the grain boundary, the minority carrier dynamics, such as diffusion ength, lifetime and mobility, with their spatial distribution, and the recombination process of photo-excited carriers.