Solar cell

Patent metadata

Field	Value
Publication number	US-2016013334-A1
Application number	US-201514795749-A
Country	US
Kind code	A1
Filing date	Jul 9, 2015
Priority date	Jul 9, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

A solar cell includes a substrate of a first conductive type, a plurality of first electrodes positioned on one surface of the substrate in parallel with one another, and a plurality of back surface field regions which are positioned respectively correspondingly to the plurality of first electrodes, are separated from one another, and are doped with impurities of the first conductive type at a concentration higher than the substrate. Each back surface field region includes discontinuous regions in a longitudinal direction of the first electrodes. An impurity concentration of the discontinuous regions is lower than an impurity concentration of the back surface field region.

First claim

What is claimed is:

1 . A solar cell comprising:
a substrate of a first conductive type; a plurality of first electrodes positioned on one surface of the substrate in parallel with one another; and a back surface field region positioned correspondingly to the plurality of first electrodes, separated from one another, and doped with impurities of the first conductive type at a concentration higher than the substrate, wherein the back surface field region includes discontinuous regions in a longitudinal direction of the first electrodes, and wherein an impurity concentration of the discontinuous regions is lower than an impurity concentration of the back surface field region.

2 . The solar cell of claim 1 , wherein the impurity concentration of the discontinuous regions is the same as an impurity concentration of the substrate.

3 . The solar cell of claim 2 , wherein the impurity concentration of the discontinuous regions has a Gaussian distribution, in which left and right sides of the discontinuous regions are symmetric to each other.

4 . The solar cell of claim 1 , wherein a width of the back surface field region is two to five times a width of the first electrodes and is less than a pitch of the first electrodes.

5 . The solar cell of claim 1 , further comprising a plurality of second electrodes positioned in a direction crossing the first electrodes and configured to have a width greater than the first electrodes,
wherein the discontinuous regions are positioned at crossings of the first electrodes and the second electrodes.

6 . The solar cell of claim 5 , wherein a width of the discontinuous regions is equal to or greater than the width of the second electrodes.

7 . The solar cell of claim 5 , wherein the discontinuous regions include first discontinuous regions positioned at the crossings and second discontinuous regions positioned between adjacent crossings.

8 . The solar cell of claim 7 , wherein a width of the first discontinuous regions is greater than a width of the second discontinuous regions.

9 . The solar cell of claim 1 , further comprising:
a second electrode positioned in a direction crossing the first electrodes and configured to have a width equal to or greater than the first electrodes; and pads selectively positioned at crossings of the first electrodes and the second electrodes, wherein the discontinuous regions are positioned opposite the pads.

10 . The solar cell of claim 9 , wherein a width of the pads in the longitudinal direction of the first electrodes is equal to or less than a width of the discontinuous regions in the longitudinal direction of the first electrodes.

11 . The solar cell of claim 9 , wherein each first electrode includes a disconnection portion, in which a first electrode is not formed, and
wherein the discontinuous regions include first discontinuous regions positioned opposite the pads and second discontinuous regions positioned opposite the disconnection portions.

12 . A solar cell module comprising:
a plurality of solar cells each including a substrate of a first conductive type, a plurality of first electrodes positioned on a front surface of the substrate, and a plurality of second electrodes positioned on a back surface of the substrate; and a plurality of wiring members configured to connect the plurality of first electrodes of a first solar cell among the plurality of solar cells to the plurality of second electrodes of a second solar cell adjacent to the first solar cell, wherein each of the plurality of solar cells includes a back surface field region, which is positioned correspondingly to the plurality of second electrodes, is separated from one another, and is doped with impurities of the first conductive type at a concentration higher than the substrate, wherein the back surface field region includes discontinuous regions selectively positioned at crossings crossing the plurality of wiring members and the back surface field region, and wherein an impurity concentration of the discontinuous regions is lower than an impurity concentration of the back surface field region.

13 . The solar cell module of claim 12 , wherein a plurality of pads are selectively positioned in the discontinuous regions and increase an area of crossings of the plurality of wiring members and the plurality of second electrodes.

14 . The solar cell module of claim 13 , wherein the plurality of second electrodes include a plurality of connection electrodes configured to connect the plurality of pads in a longitudinal direction of the wiring members, and
wherein a width of the discontinuous regions positioned correspondingly to the connection electrodes is the same as a width of the discontinuous regions positioned correspondingly to the pads.

15 . The solar cell module of claim 13 , wherein a number of the discontinuous regions based on one of the plurality of wiring members is equal to or more than a number of the pads based on the one wiring member and is equal to or less than a total number of second electrodes.

16 . The solar cell module of claim 12 , wherein a total number of the discontinuous regions is equal to or less than a total number of crossings of the second electrodes and the wiring members.

17 . The solar cell module of claim 12 , wherein the plurality of wiring members are divided into wiring members positioned opposite the discontinuous regions and wiring members, which are not opposite to the discontinuous regions.

18 . The solar cell module of claim 12 , wherein a ratio of a minimum number of wiring members, which are not opposite to the discontinuous regions, to a total number of wiring members is 0.2 to 0.4.

Assignees

• Lg Electronics Inc

Inventors

• Hwang Sunghyun
• Kim Jinsung
• Lee Hyunho
• Cho Haejong
• Oh Donghae

Classifications

• H10F30/221

  the potential barrier being a PN homojunction · CPC title

• H10F30/20

  the devices having potential barriers, e.g. phototransistors · CPC title

• H10F19/00

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

• H10F10/00

  Individual photovoltaic cells, e.g. solar cells (electrolytic light-sensitive devices, e.g. dye-sensitised solar cells, H01G9/20) · CPC title

• H10F77/20 Primary

  Electrodes · CPC title