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SOLAR CELL ELEMENT

外国特許コード F180009399
整理番号 (FPV004)
掲載日 2018年4月20日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP026172
国際公開番号 WO 2018016548
国際出願日 平成29年7月20日(2017.7.20)
国際公開日 平成30年1月25日(2018.1.25)
優先権データ
  • 特願2016-142379 (2016.7.20) JP
発明の名称 (英語) SOLAR CELL ELEMENT
発明の概要(英語) In a solar cell element according to the present invention, a plurality of concavo-convex sections are provided across the entire rear surface of a silicon substrate, the concave sections being separated from each other with the convex sections serving as side walls, and a contact layer being formed in the bottom parts of the concave sections. With such a structure, it is possible to achieve high light conversion efficiency with the concave sections while mechanical strength is maintained by the convex sections. As a result, an ultrathin silicon solar cell having an advantageous structure from the standpoint of light conversion efficiency can be provided while ensuring adequate mechanical strength as a silicon solar cell (element).
特許請求の範囲(英語) [claim1]
1. 1 Of the first conductivity type on the rear surface of a silicon substrate having a plurality of recesses and protrusions are provided on the entire surface and over, said recesses being spaced apart from each other as the convex portion and the side wall, wherein the surface of the silicon substrate provided on a rear surface of the silicon substrate from the bottom surface of the recess is 100μm or less and a depth of up to, the front surface side of the silicon substrate, wherein the first conductivity type of the 1 or 1 of the first conductivity type opposite the first conductivity type having a first 2 of the 1 and the contact layer is formed, the bottom portion of the plurality of the recesses, wherein the first contact layer of the 1 having a conductivity type opposite to the first contact layer is formed of 2, 1 connected to the second contact layer of the first electrode and the 1, wherein the first contact layer of the 2 to 2 and a second electrode connected to the second solar cell element.
[claim2]
2. Wherein the first contact layer and the silicon substrate 1 between the second surface of the amorphous layer is provided with 1, the plurality of the recesses and the bottom of the back of the silicon substrate between the second layer is an amorphous layer 2 is provided, the first and the second amorphous layer is formed of 1 2, the amorphous silicon layer or amorphous silicon oxide layer, the solar cell element according to claim 1.
[claim3]
3. 1 Of the first conductivity type are made in the whole back surface of the silicon substrate having a plurality of recesses and protrusions are provided and over, said recess and a sidewall on the convex portion is spaced apart from each other, wherein the surface of the silicon substrate provided on a rear surface of the silicon substrate from the bottom surface of the recess is less than or equal to a depth of up to 100μm, the front surface side of the silicon substrate, wherein 1 is the same as the conductivity type of the first conductivity type and having a surface electric field layer is formed, wherein a part of a plurality of recesses are arranged on the bottom of, the surface field layer having a conductivity type opposite to the first contact layer is formed with 2, wherein the bottom of the recess of the rest of the surface electric field layer is of the same conductivity type having a first contact layer is formed and 3, wherein the first contact layer of the 2 and 2 connected to the second electrode, wherein the first contact layer of the 3 3 and a second electrode connected to the second solar cell element.
[claim4]
4. Wherein the surface electric field layer and the surface of the silicon substrate 1 between the second layer is an amorphous layer is provided, the plurality of the recesses and the bottom part of the back surface of the silicon substrate between the second layer is an amorphous layer 2 is provided, and the rest of the bottom of the recess of the silicon substrate from the back surface of the first layer is an amorphous layer 3 is provided, wherein the first 1, second 2, and 3 of the first amorphous layer, the amorphous silicon layer or amorphous silicon oxide layer, the solar cell element according to claim 3.
[claim5]
5. 2 Said first amorphous layer and the second layer is an amorphous layer 3 is in a single thickness of the amorphous layer, the solar cell element according to claim 4.
[claim6]
6. Wherein the anti-reflective layer on the side surface of the silicon substrate is provided with a structure, wherein any one of claims 1-5 1 the solar cell element.
[claim7]
7. Wherein the anti-reflective structure, the anti-reflection film or having a micro-roughness for confining the light is a texture structure, the solar cell element according to claim 6.
[claim8]
8. Wherein the back surface of the solar cell devices, and the entire surface of at least the exposed surface is covered with the passivation film, any one of claims 1-5 1 the solar cell element.
[claim9]
9. Wherein the passivation film is SiO2HFAlOX, according to claim 8 the solar cell element.
[claim10]
10. Such that the recess is embedded in the insulating material, wherein any one of claims 1-5 1 the solar cell element.
[claim11]
11. Wherein the silicon substrate is a single crystal silicon substrate, any one of claims 1-5 1 of the solar cell element.
[claim12]
12. Wherein the anti-reflection film is a silicon nitride film, any one of claims 1-5 1 the solar cell element.
[claim13]
13. Wherein the first electrode is at least one of 1-3, in which the ITO film, any one of claims 1-5 1 the solar cell element.
[claim14]
14. Wherein the silicon substrate from the back side when viewed from top, the bottom portion of the plurality of the recesses provided on the first electrode or the second 2 3 shape of the electrodes, the stripe-shaped, triangular, rectangular, circular, or honeycomb shapes, of any one of claims 1-5 1 the solar cell element.
[claim15]
15. Wherein the first electrode and the second electrode of the 2 3 shape and a stripe-shaped, formed as a comb-like electrodes, the solar cell element according to claim 14.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • ICHIKAWA YUKIMI
  • HIRAI MASAKAZU
  • YOSHIBA SHUHEI
国際特許分類(IPC)
指定国 (WO201816548)
National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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