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Solar cell, solar module and system and fabrication method thereof

Inactive Publication Date: 2009-12-10
DELSOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]Accordingly, it is one object of the invention to provide an improved rear surface for a solar cell such that the recombination of electron-hole pairs at the metal / semiconductor interface of the solar cell is reduced.
[0013]Further, it is a method of the invention to provide an improved solar cell bettering the efficiency also reducing the manufacturing cost of solar cells at present

Problems solved by technology

For decades, the problems of the petroleum shortage and the greenhouse effect are getting worse and worse; therefore many countries invent more and more efforts in the development of energy saving products, such as solar cell.
Such aluminum oxide layer will not only increase contact resistance but also bring the difficulty for solar cell soldering.

Method used

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  • Solar cell, solar module and system and fabrication method thereof
  • Solar cell, solar module and system and fabrication method thereof
  • Solar cell, solar module and system and fabrication method thereof

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example

[0050]Hereinafter shows the results of experiments conducted on solar cell elements fabricated according to the foregoing embodiment.

[0051]As to substrate, two kinds of flat plate of p-type multi-crystalline silicon substrate and p-type monocrystallne silicon substrate of 156 mm×156 mm in size both are fabricated by the foregoing method.

TABLE 1Voc (V)Isc (A)FF (%)Eff. (%)PolysiliconConventional0.617.7677.1414.97This invention0.617.7877.6215.11MonosiliconConventional0.618.3278.1716.66This invention0.618.3378.5116.81

[0052]Table 1 shows the result of cell efficiency fabricated by the conventional method and the foregoing method pursuant to the preferred embodiment. By increasing Isc and FF, the efficiency is improved 0.14% in multicrystalline and 0.15% in monocrystalline in this invention.

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Abstract

A solar cell having an improved structure of rear surface includes a p-type doped region, a dense metal layer, a loose metal layer, at least one bus bar opening, and solderable material on or within the bus bar opening. The solderable material contacts with the dense aluminum layer. The improved structure in rear surface increases the light converting efficiency, and provides a good adhesion between copper ribbon and solar cell layer thereby providing cost advantages and reducing the complexity in manufacturing. A solar module and solar system composed of such solar cell are also disclosed.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to and the benefit of U.S. provisional application Ser. No. 61 / 060,108 filed Jun. 9, 2008.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a solar cell and a method of making the same. More particularly, this invention relates to a solar cell with an improved rear surface structure, a solar module and a solar system composed of such solar cell.[0004]2. Description of the Prior Art[0005]For decades, the problems of the petroleum shortage and the greenhouse effect are getting worse and worse; therefore many countries invent more and more efforts in the development of energy saving products, such as solar cell. Worldwide solar system installations increased by 5,948 MW in 2008, up from 2,826 MW installed during the previous year. In 1985, annual solar installation demand was only 21 Megawatts. The market size of solar cell industry has increased several times fr...

Claims

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Application Information

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IPC IPC(8): H01L31/00
CPCH01L31/022425H01L31/028H01L31/03682H01L31/048Y02E10/547B32B17/10018B32B17/10788B32B2327/12Y02E10/546H01L31/068H01L31/1804Y02P70/50
Inventor LIN, SHIH-CHENGCHANG, WEI-CHIHCHOU, YI-CHINHUANG, CHORNG-JYEWANG, PIN-SHENG
Owner DELSOLAR