Solar cells and their modules

Abstract

The utility model discloses a solar energy battery and a module thereof, comprising a basal plate, a passivation layer configured on the basal plate, a plurality of opening holes on the passivation layer, and a plurality of secondary electrodes in the plurality of opening holes and in contact with the back surface. Without any increase in the multiple hole relative to the passivation layer under the condition of the rear projection area ratio, the plurality of holes are extended toward different directions and in different arrangement structures, so that the plurality of second electrodes are uniformly distributed on the back surface in order to increase the chance of guiding out the basal plate and improve the capability of collecting carrier. In the meantime, the rate of the passivation layer area is not reduced and the passivation layer has good quality. As a result, the open circuit voltage and the photoelectric conversion efficiency can be improved and the series resistance is reduced.

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 , figure 2 , a general solar cell mainly includes: a substrate 91 with an opposite front 911 and a back 912, a positive electrode 92 located on the front 911, a plurality of back electric field structures 93 (Local Back Surface) located at local parts of the back 912 Field, referred to as LBSF), a passivation layer 94 located on the back surface 912, a plurality of elongated linear openings 95 located on the passivation layer 94, a first back electrode 96, and a plurality of each other The second back electrodes 97 are arranged at intervals and connected to the first back electrodes 96 . In addition, a general solar cell may also be provided with an anti-reflection layer (not shown) on the front surface 911 to increase the light absorption effect. [0003] The first back electrode 96 includes a plurali...

AI Technical Summary

Problems solved by technology

If blindly increasing the contact area between the plurality of first conductive portions 961 and the back surface 912, it is necessary to increase the area ratio of the plurality of linear openings 95 relative to the projection of the passivation layer 94 on the back surface 912, so On the contrary, the passivation quality and open circuit voltage of the passivation layer 94 will be reduced because the area ratio of the passivation layer 94 will decrease.

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