Solar cell and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2022093809-A1
Application number	US-202117540983-A
Country	US
Kind code	A1
Filing date	Dec 2, 2021
Priority date	Sep 19, 2012
Publication date	Mar 24, 2022
Grant date	—

Abstract

Discussed is a method for manufacturing a solar cell including forming a lightly doped emitter region having a first sheet resistance at a first surface of a substrate, forming a dopant layer on the lightly doped emitter region, irradiating a laser beam onto the dopant layer to form a heavily doped emitter region having a second sheet resistance less than the first sheet resistance; forming a first finger electrode on the heavily doped emitter region in a first direction and forming a first bus bar electrode in a second direction to form a first electrode, and forming a second electrode on a second surface of the substrate, wherein the forming of the first bus bar electrode of the first electrode includes coating a bus bar paste including electrically conductive metal particles and a thermosetting resin and performing a predetermined temperature process on the bus bar paste.

First claim

What is claimed is:

1 . A method for manufacturing a solar cell comprising:
forming a lightly doped emitter region having a first sheet resistance at a first surface of a substrate; forming a dopant layer on the lightly doped emitter region; irradiating a laser beam onto the dopant layer to form a heavily doped emitter region having a second sheet resistance less than the first sheet resistance; forming a first finger electrode on the heavily doped emitter region in a first direction and forming a first bus bar electrode in a second direction to form a first electrode; and forming a second electrode on a second surface of the substrate, wherein the forming of the first bus bar electrode of the first electrode includes coating a bus bar paste including electrically conductive metal particles and a thermosetting resin and performing a predetermined temperature process on the bus bar paste.

2 . The method of claim 1 , wherein the predetermined temperature process of the bus bar paste is performed at about 300° C. to 350° C.

3 . The method of claim 1 , wherein when the predetermined temperature process is performed on the bus bar paste, the bus bar paste does not pass through the dopant layer.

3 . The method of claim 1 , wherein when the predetermined temperature process is performed on the bus bar paste, a recrystallized metal layer is not formed at an interface between the bus bar paste and the emitter region.

4 . The method of claim 1 , wherein a shape of the electrically conductive metal particles after performing the predetermined temperature process is the same as a shape of the electrically conductive metal particles before performing predetermined low temperature process.

5 . The method of claim 1 , wherein the bus bar paste lacks a glass frit or includes a glass frit equal to or less than about 10% per unit volume of the bus bar paste.

6 . The method of claim 1 , wherein the thermosetting resin includes a monomer-based epoxy resin or an acrylic resin.

7 . The method of claim 1 , wherein the first finger electrode includes a seed layer containing nickel (Ni) formed on the heavily doped emitter region and a conductive metal layer formed on the seed layer, wherein when the predetermined temperature process is performed on the bus bar paste, a nickel-silicide layer generated by chemical bonding between nickel (Ni) and silicon (Si) of the heavily doped emitter region is formed on the seed layer of the first finger electrode.

Assignees

• Lg Electronics Inc

Inventors

• Nam Jeongbeom
• Chung Indo
• Jung Ilhyoung
• Kim Jinah

Classifications

• H10F10/14

  Photovoltaic cells having only PN homojunction potential barriers · CPC title

• H10F71/00

  Manufacture or treatment of devices covered by this subclass (patterning processes to connect thin photovoltaic cells in integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/33; manufacture or treatment of encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/80; manufacture or treatment of integrated devices, or assemblies of multiple devices, comprising at least one element in which radiation controls the flow of current H10F39/00) · CPC title

• H10F77/20

  Electrodes · CPC title

• H10F77/211 Primary

  for photovoltaic cells · CPC title

• H10F19/00 Primary

  Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules · CPC title