Method for electrically connecting several solar cells and photovoltaic module
A technology for solar cells and photovoltaic modules, applied in electrical components, photovoltaic power generation, electrical solid devices, etc., can solve problems such as non-solderable welding and complexity, and achieve reliable electrical contact, metallization and reliability.
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[0056]figure 1 A configuration of a plurality of metallized solar cells 20 electrically connected together and formed into a photovoltaic module 100 is shown. In the example shown, the solar cell 20 is a silicon wafer-based solar cell in which two types of contacts are provided on the back side of the solar cell substrate 1 . The emitter region of the solar cell is coated with an aluminum metal layer 2a forming a contact of the first type and the base region is coated with an aluminum metal layer 2b forming a contact of the second type.
[0057] Figure 5 A top view of a solar cell substrate 1 with metal layers 2a, 2b forming different types of contacts is shown.
[0058] For greater clarity, further details of the solar cell 20 are not shown in the figures, eg differently doped emitter and base regions, surface passivation layers, etc.
[0059] In preparation for the metallization process, the carrier substrate 4 is coated with a metal layer 3 which also consists of aluminu...
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