Insulation paste, method for producing insulation paste, method for manufacturing solar cell device, and solar cell device

Patent metadata

Field	Value
Publication number	US-2018294373-A1
Application number	US-201816007907-A
Country	US
Kind code	A1
Filing date	Jun 13, 2018
Priority date	Dec 25, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

An insulation paste for forming a protective layer of a solar cell device includes: a siloxane resin; an organic solvent; and multiple fillers each having a surface covered with an organic coating containing at least one material different from a material of the siloxane resin. A method for producing the insulation paste includes: preparing the multiple fillers; and mixing together a precursor of the siloxane resin, water, a catalyst, an organic solvent, and the multiple fillers. A method for manufacturing a solar cell device includes: applying the insulation paste to the passivation layer; and drying the insulation paste to form the protective layer on the passivation layer. A solar cell device includes: the passivation layer located on a semiconductor region; and the protective layer located on the passivation layer and including a siloxane resin and dimethylpolysiloxane.

First claim

1 . An insulation paste for forming a protective layer of a solar cell device, the insulation paste comprising:
a siloxane resin; an organic solvent; and multiple fillers each having a surface covered with an organic coating containing at least one material different from a material of the siloxane resin.

2 . The insulation paste according to claim 1 ,
wherein the at least one material contained in the organic coating has a structure in which the number of carbon atoms in a main chain or the total number of carbon atoms and silicon atoms in the main chain is six or more.

3 . The insulation paste according to claim 1 ,
wherein the organic coating contains at least one type selected from among octylsilane, a dodecyl group, and dimethylpolysiloxane.

4 . The insulation paste according to claim 1 , not substantially comprising an organic binder.

5 . The insulation paste according to claim 1 , further comprising a hydrolysable additive having a Si—O bond or a Si—N bond, the additive not having undergone condensation polymerization.

6 . A method for producing an insulation paste, the method comprising:
preparing multiple fillers each having a surface covered with an organic coating containing at least one material different from a material of a siloxane resin; and mixing together a precursor of the siloxane resin, water, a catalyst, an organic solvent, and the multiple fillers.

7 . The method according to claim 6 , comprising
volatilizing the water, the catalyst, and an organic component generated by reaction of the organic solvent, the precursor of the siloxane resin, and the water.

8 . A method for manufacturing a solar cell device, the method comprising:
forming a passivation layer on a semiconductor substrate; applying the insulation paste according to claim 1 to the passivation layer; and drying the insulation paste to faun the protective layer on the passivation layer.

9 . A solar cell device, comprising:
a semiconductor substrate having a p-type semiconductor region on a surface of the semiconductor substrate; a passivation layer located on the p-type semiconductor region, the passivation layer including an aluminum oxide; and a protective layer located on the passivation layer, the protective layer containing a silicon oxide, wherein the protective layer contains a siloxane resin and dimethylpolysiloxane.

10 . The solar cell device according to claim 9 ,
wherein the dimethylpolysiloxane is terminated by a methyl group.

11 . The solar cell device according to claim 10 ,
wherein the protective layer includes a Si—OH bond.

12 . The solar cell device according to claim 10 , further comprising
a silicon oxide layer between the protective layer and the passivation layer, the silicon oxide layer being denser than the protective layer.

Assignees

• Kyocera Corp

Inventors

• Ishikawa Shinya
• Shibahara Motoki
• Kitayama Satoshi
• Ota Daisuke
• Koide Takashi
• Kimura Tsuyoshi

Classifications

• H01B19/00

  Apparatus or processes specially adapted for manufacturing insulators or insulating bodies {(manufacture of porcelain for electric insulation C04B33/26)} · CPC title

• H01B3/46 Primary

  silicones · CPC title

• H01L31/0481 Primary

  Electricity · mapped topic

• H01L31/02167

  Electricity · mapped topic

• H01L31/02366

  Electricity · mapped topic