METHOD FOR IMPROVING OHMIC CONTACT BEHAVIOUR BETWEEN A CONTACT GRID AND AN EMITTER LAYER OF A SILICON SOLAR CELL

摘要

The invention relates to a method for improving ohmic contact behaviour between a contact grid and an emitter layer of a silicon solar cell. The object of the invention is to propose a method for improving contact behaviour between the contact grid and the emitter layer of silicon solar cells, which method is used after the contacting of these solar cells and thus reduces the scrap quota of solar cells with faulty contacting. In order to achieve this object, a method is proposed which has the following method steps. First a silicon solar cell (1) is provided with the emitter layer, the contact grid (5) and a back contact (3). Then the contact grid (5) is electrically contacted by a contact pin matrix (8) or contact plate connected to one terminal of a current source and the back contact (3) is electrically connected by a contact device connected to the other terminal of the current source. Using the current source, at least one current pulse is induced along the forward direction of the silicon solar cell (1), the current pulse having a pulse duration of 1 ms to 100 ms and a current strength which is equivalent to 10 to 30 times the short-circuit current strength of the silicon solar cell (1). Two alternative methods are also proposed.