Observation of Polycrystalline Solar Cell Using a Laser-SQUID Microscope
Observation of Polycrystalline Solar Cell Using a Laser-SQUID Microscope
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DOI：
10.1109/tasc.2010.2086416
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发表时间：
2011-06
影响因子：
1.8
通讯作者：
Y. Nakatani;T. Hayashi;H. Itozaki
中科院分区：
文献类型：
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作者：
Y. Nakatani;T. Hayashi;H. Itozaki
激光SQUID显微镜是一种用于半导体电性能无损检测的技术。在激光SQUID显微镜中，光电流由能量大于半导体样品带隙的激光诱导。由该光电流感应的磁场由SQUID检测。在我们的实验中，激光聚焦在样品的表面上，并将高温超导SQUID放置在样品后面以检测来自光电流的磁场。当SQUID和激光光斑的相对位置固定时，对样品进行光栅扫描。使用的样品是市售的含有p-n结的多晶硅太阳能电池。它的表面有几个线电极和一个传输电极层，背面覆盖着一个金属电极。我们使用1065 nm激光研究了一块多晶太阳能电池。成功地观测到了激光产生的磁场。生成的图像显示了太阳能电池的不均匀性。
Laser-SQUID microscopy is a technique for nondestructive inspection of the electrical properties of semiconductors. In laser-SQUID microscopy, a photocurrent is induced by a laser with an energy larger than the band gap of the semiconductor sample. The magnetic field induced by this photocurrent is detected by a SQUID. In our experiment the laser was focused on the surface of the sample, and a high-temperature superconducting SQUID was positioned behind the sample to detect the magnetic field from the photocurrent. The sample was raster scanned while the relative position of the SQUID and laser spot was fixed. The sample used was a commercially available polycrystalline silicon solar cell containing a p-n junction. It had several line electrodes and a transport electrode layer on the surface, and the reverse side was covered with a metal electrode. We studied a piece of this polycrystalline solar cell using a 1065 nm laser. Magnetic field induced by the laser was observed successfully. The produced image shows the inhomogeneity of the solar cell.