JPS57172778A - Solar battery - Google Patents

Abstract

PURPOSE:To facilitate the electrode formation of a solar battery by a method wherein a P<+> layer and an N<+> layer covering all P layers and N layers are formed at the exposed surfaces of P-N junctions in composing a solar battery by alternately forming P layers and N layers in multilayer structure and each P layer and N layer are selectively and electrically connected by the P<+> layer and N<+> layer. CONSTITUTION:When epitaxial growth is alternately applied to single crystal P layers 12 and N layers 13 to compose multilayer structure, the thickness of each P layer 12 and N layer 13 is made almost twice the diffusion distances Ln and Lp of minor carriers or less than twice respectively. Next, the wafer 11 is cut into the thickness equivalent to the thickness (d) of a solar battery along the vertical direction of P-N junction faces 14 to form a rectangular-shaped chip 15 and most of the exposed surfaces of the P-N junction 14 faces are covered with a mask 16 and a faced mask 17. After that, a P<+> layer 21 and an N<+> layer 22 are selectively diffused to each end section of the exposed surface 18 and vertical side exposed surfaces 19 and 20 connected to each end section of the exposed surface 18 and ohmic electrodes 23 and 24 are formed on the P<+> layer 21 and N<+> layer 22.