Solar cell and solar cell module group

Abstract

The invention discloses a solar cell and a solar cell module group. The solar cell includes a second conductive substrate, a plurality of first conductive layers and second conductive layers, a passivation layer, a plurality of first holes and second holes, a first electrode, and a second electrode. The second conductive substrate includes a light receiving side and a back side. The first conductive layers are arranged on the back side. The second conductive layers are arranged on the back side in a two-dimensional array manner and the second conductive layers are independent from each other and are not connected with each other. Each second conductive layer is enclosed by the first conductive layer. The passivation layer is arranged on the first conductive layers and second conductive layers. The first holes and second holes are arranged in the passivation layer and are corresponding to the first first conductive layers and second conductive layers. The first electrode and the second electrode are arranged on the passivation layer, and are respectively contacted with the first conductive layers via the first hole and with the second conductive layers via the second hole.

Description

technical field [0001] The present invention relates to a photoelectric conversion device, and in particular to a solar cell. Background technique [0002] Since an interdigitated back contact solar cell (IBC) has high cell efficiency, it has become a trend in the development of solar cells. Please refer to figure 1 , which is a partial cross-sectional view of an interdigitated back-contact solar cell. The interdigitated back-contacted solar cell 100 mainly includes an N-type substrate 102, N + Type conductive layer 108, anti-reflection layer 110, N ++ Type doped layer 114, P + type doped layer 116 , passivation layer 118 , N-type electrode 120 and P-type electrode 122 . [0003] In the solar cell 100 , the opposite sides of the N-type substrate 102 respectively have a light-receiving surface 104 and a back surface 106 . A rough structure 112 is provided on the light-receiving surface 104 to increase the amount of incident light. N + The conductive layer 108 is dispo...

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Problems solved by technology

However, when carriers are formed on the light-receiving surface 104 of the N-type substrate 102 corresponding to the double-stage structure 124 on the other side, the derivation path of the carriers here can only go to the linear openings 128, 130 moves, which means that the distance between the N-type electrode 120 and the P-type electrode 122 in the openings 128 and 130 for carriers to move is longer, which will lead to a decrease in the efficiency of carrier collection, thereby making the current density of the solar cell 100 unable to Effectively improve, and lead to the problem that the overall battery efficiency cannot be improved

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