Solar cell and solar cell module group

Abstract

The invention discloses a solar cell and a solar cell module group. The solar cell comprises a substrate, a positive electrode, and a back electrode. The substrate comprises a light-receiving surface where the positive electrode is arranged, a back surface where the back electrode is arranged, and an emitter electrode layer which is located on the light-receiving surface and is provided with a heavily doped region and a light doped region. The positive electrode comprises a first convergence electrode, a second convergence electrode, and a plurality of finger-shaped electrodes. The heavily doped region is provided with a first heavily doped part and a second heavily doped part, which are located between the first convergence electrode and the second convergence electrode. The solar cell can improve the collection efficiency of charge carriers, and reduces the recombination probability of charge carriers, thereby improving the collection efficiency of current, and improving the photoelectric conversion efficiency and open-circuit voltage of the solar cell.

Description

technical field [0001] The invention relates to a battery and its module, in particular to a solar battery and its module. Background technique [0002] refer to figure 1 , a general solar cell includes a substrate 91 that can convert light energy into electrical energy, a positive electrode 92 disposed on a light-receiving surface 911 of the substrate 91, and a positive electrode 92 disposed on the substrate 91 opposite to the light-receiving surface 911 A back electrode (not shown) on the back side (not shown). The positive electrode 92 has a plurality of bus electrodes 921 extending along a first direction 98 and arranged at intervals along a second direction 99 , and a plurality of fingers extending along the second direction 99 and arranged at intervals along the first direction 98 An electrode 922 , the plurality of finger electrodes 922 are connected to the plurality of bus electrodes 921 . In manufacturing, a plurality of solar cells and other components are usual...

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Problems solved by technology

However, considering that the amount of conductive material used for the multiple bus electrodes 921 is large, the conductive paste with a low silver content is usually used to form the multiple bus electrodes 921 in manufacturing. Although the above-mentioned method can save manufacturing costs, it is Therefore, the conductivity of the plurality of bus electrodes 921 is lower than that of the plurality of finger electrodes 922, so that the carriers generated in the area adjacent to the plurality of bus electrodes 921 in the substrate 91 are not easily collected, and the current collection The effect is poor, thus reducing the open circuit voltage and photoelectric conversion efficiency of the solar cell

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