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    • 9. 发明授权
    • Solar cell and method of making same
    • 太阳能电池及其制作方法
    • US5320684A
    • 1994-06-14
    • US889121
    • 1992-05-27
    • James AmickFrank J. BottariJack I. Hanoka
    • James AmickFrank J. BottariJack I. Hanoka
    • H01L31/04H01L31/0224H01L31/048H01L31/068H01L31/06H01L31/18
    • H01L31/022425H01L31/048H01L31/068Y02E10/547
    • An improved photovoltaic cell and a method for making such cells is provided. In a generic sense, the preferred method comprises the step of (1) applying a coating of an aluminum metal paste onto the rear surface of the substrate in a suitable rear contact pattern, (2) applying a layer of a glass frit paste so as to envelop the rear contact, and (3) firing those pastes so as to form a rear contact protected by a glass overcoating. A front contact also is formed by applying a silver metal/glass frit paste onto the anti-reflection coating in a related front contact pattern. The front and rear contacts may be fired simultaneously or in two different steps. However, a single firing method is preferred because thicker aluminum contacts are possible.In a preferred embodiment, the cell provided by the invention includes (1) a silicon substrate having a shallow p-n junction adjacent its front surface, (2) a plurality of silver soldering pads bonded to the rear surface of the substrate, (3) an aluminum contact on the rear surface of the substrate having openings that expose at least portions of said silver pads, (4) a silver contact surrounded by an anti-reflection coating on the front surface of the substrate, and (5) a glass layer overlying the aluminum contact so as to protect it against oxidation and corrosion. The glass layer has windows exposing portions of the soldering pads for solder attachment of connecting wire ribbons.
    • 提供改进的光伏电池和制造这种电池的方法。 在一般意义上,优选的方法包括以下步骤:(1)以合适的后接触图案将铝金属浆料的涂层施加到基板的后表面上,(2)施加玻璃料浆料层,以便 以包围后部接触,和(3)对这些糊状物进行烧制,以形成由玻璃复涂保护的后部接触。 通过将银金属/玻璃料浆料以相关的前接触图案施加到防反射涂层上也形成前接触。 可以同时或以两个不同的步骤烧制前触点和后触点。 然而,单一焙烧方法是优选的,因为较厚的铝触点是可能的。 在优选实施例中,本发明提供的电池包括(1)在其前表面附近具有浅pn结的硅衬底,(2)多个结合到衬底背面的银焊盘,(3) 在基板的后表面上的铝接触具有露出所述银焊盘的至少一部分的开口,(4)由基板的前表面上的防反射涂层包围的银接触,以及(5)覆盖 铝接触,以保护其免受氧化和腐蚀。 玻璃层具有暴露焊接部分的窗口,用于连接线带的焊料附着。