US 11,984,522 B2
High-efficiency backside contact solar cell and method for manufacturing thereof
Hiroshi Hashigami, Annaka (JP); Takenori Watabe, Annaka (JP); and Hiroyuki Ohtsuka, Karuizawa-machi (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 16/623,872
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed May 7, 2018, PCT No. PCT/JP2018/017615
§ 371(c)(1), (2) Date Dec. 18, 2019,
PCT Pub. No. WO2019/003638, PCT Pub. Date Jan. 3, 2019.
Claims priority of application No. 2017-124479 (JP), filed on Jun. 26, 2017.
Prior Publication US 2021/0143291 A1, May 13, 2021
Int. Cl. H01L 31/068 (2012.01); H01L 31/05 (2014.01); H01L 31/18 (2006.01)
CPC H01L 31/0682 (2013.01) [H01L 31/0516 (2013.01); H01L 31/186 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A solar cell which is a backside contact solar cell, the solar cell comprising:
a crystal silicon substrate having a first main surface,
a p-type region having a p-conductive type, and having:
a first p-type region surface formed on the first main surface, and
a second p-type region surface positioned on an opposite side of the p-type region relative to the first p-type region surface; and
an n-type region having an n-conductive type, and having:
a first n-type region surface formed on the first main surface, and
a second n-type region surface positioned on an opposite side of the n-type region relative to the first n-type region surface, and that is provided with:
a positive electrode having a positive electrode surface formed on the second p-type region surface, and comprising a laminated conductor of:
a first electric conductor which is formed on the second p-type region surface and which is mainly composed of silver and includes a group III element compound containing a group III element, and
a second electric conductor which is laminated on the first electric conductor and which has a lower content ratio of the group III element than the first electric conductor, and
a negative electrode having a negative electrode surface formed on the second n-type region surface, and comprising the second electric conductor,
wherein:
the group III element compound includes one or more compounds selected from the group consisting of boron nitride, aluminum chloride, and aluminum bromide, and
the second p-type region surface, the second n-type region surface, the positive electrode surface, and the negative electrode surface together define a flat two-dimensional surface.