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Back emitter symmetric hetero-junction solar cell and preparation method thereof

A back-emitter, solar cell technology, used in photovoltaic power generation, circuits, electrical components, etc., can solve problems such as light absorption loss, and achieve the effect of reducing light absorption, eliminating current loss, and improving collection efficiency

Active Publication Date: 2014-03-19
TRINA SOLAR CO LTD
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Problems solved by technology

[0002] The emitter of traditional heterojunction solar cells is located on the photosensitive surface, resulting in the loss of light absorption

Method used

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  • Back emitter symmetric hetero-junction solar cell and preparation method thereof
  • Back emitter symmetric hetero-junction solar cell and preparation method thereof

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Embodiment Construction

[0029] Such as figure 1 and 2 As shown, a back-emitter symmetric heterojunction solar cell includes a silicon substrate 1 with a passivation layer on the light-receiving surface of the silicon substrate 1, and on the passivation layer there are opposite conductive electrodes isolated from each other and distributed alternately. type semiconductor thin film, and an anti-reflection layer 6 is provided on the surface of the opposite conductivity type semiconductor thin film.

[0030] There is a passivation layer on the backlight surface of the silicon substrate 1, and on the passivation layer are semiconductor films of opposite conductivity types that are isolated from each other and alternately distributed. The substrate 1 forms a heterojunction back emitter, and has a transparent conductive film 7 on the surface of the semiconductor film of the opposite conductivity type, and makes respective metal electrodes 8 on the semiconductor film of the opposite conductivity type on the...

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Abstract

The invention relates to a back emitter symmetric hetero-junction solar cell and a preparation method thereof. According to the solar cell, a light receiving surface and a backlight surface of a silicon substrate are provided with mutually-isolated and alternately-distributed semiconductor films with opposite conductivity types, a semiconductor film forming a hetero-junction back emitter and the semiconductor film of the same conductivity type on the light receiving surface are correspondingly arranged on the two sides of the silicon substrate, and the doping concentration of the semiconductor film forming the hetero-junction back emitter is greater than the doping concentration of the semiconductor film of the same conductivity type on the light receiving surface. The back emitter symmetric hetero-junction solar cell and the preparation method thereof have the beneficial effect that current loss generated due to electrode shading is eliminated. Non-uniform built-in potential formed by a coplanar alternate symmetric hetero-junction structure inside the substrate divides the cell substrate into multiple regional bases, which is conducive to lateral transport of internal carriers, greatly reduces the carrier diffusion length and improves the carrier collection efficiency.

Description

technical field [0001] The invention relates to a back emitter symmetric heterojunction solar cell and a preparation method thereof. Background technique [0002] The emitter of traditional heterojunction solar cells is located on the photosensitive surface, resulting in the loss of light absorption. With the development of thin-film / crystalline silicon heterojunction solar cell technology, light management and carrier transport have become research hotspots. The research and development direction of light management is mainly to reduce the light absorption loss of the doped layer on the photosensitive surface. The research hotspots are the direction of the built-in potential distribution inside the battery and the design of the P-N layout, which has become a difficult point in the design of this field. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a back-emitter symmetric heterojunction solar cell and its pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0747H01L31/0352H01L31/18H01L31/20
CPCY02E10/50H01L31/035281H01L31/075H01L31/202Y02E10/548Y02P70/50
Inventor 郭万武
Owner TRINA SOLAR CO LTD
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