| 摘要 |
PURPOSE:To obtain a highly efficient battery, in a semiconductor wafer having an upper surface electrode on a light receiving surface and a lower surface electrode on a back side, by using a polycrystal semiconductor wherein many crystal particles are assembled and contacted via crystal particle boundaries as a wafer, and positioning the pattern of the upper surface electrode on the crystal particles as much as possible. CONSTITUTION:The poly crystal Si wafer 1, wherein many small crystal particles 3 are assembled and contacted via the crystal particle boundaries 4, is used as a substrate for the light receiving surface 2, and PN junction is formed. Then the upper surface electrode 5 is provided on the light receiving surface 2 and the lower surface electrode is provided on the back surface. At this time the lower surface electrode is uniformly deposited, but the upper surface electrode 5 only is constituted as follows. A wedge shaped central electrode 6 for taking out the current which gradually increases at the center, and a plurality of auxiliary electrodes 7 are protruded on both sides. Then many electrode lines 8 branched from the electrodes 7 are positioned on the crystal particles 3 as much as possible so that the current passing the crystal particle boundaries which hinder the electron behavior becomes zero or the value close to zero. |
