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Manufacturing a solar cell with backside contacts

A solar cell and backside technology, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, circuits, etc., can solve the problems of complex solar cells and cost hindering the large-scale application of solar cells, and achieve the effect of reliable regeneration

Inactive Publication Date: 2005-03-09
SHELL SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manufacturing such solar cells with contacts only on the back is very complex, involving multiple masking, etching and cleaning process steps
Also, the metallization structures must be accurately aligned
Larger cost of manufacturing solar cells with back contacts hinders large-scale application of these more efficient solar cells

Method used

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  • Manufacturing a solar cell with backside contacts
  • Manufacturing a solar cell with backside contacts
  • Manufacturing a solar cell with backside contacts

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Embodiment Construction

[0023] now refer to figure 1 , figure 1 A partial sectional view of a solar cell 1 according to the invention is shown schematically and not to scale.

[0024] The solar cell 1 comprises a silicon wafer 3 with a light-receiving front side 4 and a back side 6 . The silicon wafer 3 has a basic doping, in this example p-type doping.

[0025] On the back side 6, the silicon wafer 3 is provided with an interdigitated semiconductor pattern comprising at least one first pattern of first diffusion regions 9 with a first doping and at least one second diffusion region 10 of second pattern. The second diffusion region 10 is separated from the first diffusion region 9 and they have a second doping different from the first doping. Each second diffusion region 10 is arranged along the side of at least one trench 12 extending from the backside 6 into the silicon wafer 3 . A suitable number of grooves ranges from 1 to 100 grooves per centimeter of wafer width, suitable groove widths ran...

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Abstract

A solar cell involving a silicon wafer having a basic doping, a light-receiving front side and a backside, which is provided with an interdigital semiconductor pattern, which interdigital semiconductor pattern has a first pattern of at least one first diffusion zone having a first doping and a second pattern of at least one second diffusion zone, separated from the first diffusion zone(s) and having a second doping that differs from the first doping, wherein each second diffusion zone is arranged along the sides of at least one groove extending from the backside into the silicon wafer.

Description

technical field [0001] The invention relates to a method of manufacturing a solar cell with a back contact. Background technique [0002] A solar cell includes a silicon wafer with a light-receiving front side and a back side. The silicon wafer is provided with a basic doping, where the basic doping can be n-type or p-type. Solar cells are usually provided with metal contacts on the light-receiving front side and on the back side to carry away the current generated by the solar cell. Due to the shading of the active area of ​​the solar cell by the metal covering, especially the metal contacts on the light-receiving backside pose problems regarding the degree of efficiency. Although the metal coverage is optimized to reduce shadowing, a metal coverage of about 10% is unavoidable since the metallization must occur in such a way as to keep electrical losses small. However, with metal contacts on the back, no shadowing risk occurs, and an optimization between electrical losse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/04H01L31/0224
CPCH01L31/035281H01L31/0682Y02E10/50H01L31/022441Y02E10/547H01L31/03529H01L31/1804Y02P70/50
Inventor 阿道夫·闵采尔
Owner SHELL SOLAR
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