Colorful thin film solar cell for minimizing reduction of efficiency

Patent metadata

Field	Value
Publication number	US-2019252560-A1
Application number	US-201815906415-A
Country	US
Kind code	A1
Filing date	Feb 27, 2018
Priority date	Feb 13, 2018
Publication date	Aug 15, 2019
Grant date	—

Abstract

The present invention provides a colored thin film solar cell capable of minimizing reduction of efficiency of a thin film solar cell and improving a utility value by visually changing a black color of the thin film solar cell into an aesthetically pleasing color to exhibit an exterior appearance, thereby facilitating commercialization of the thin film solar cell, and provides a method for manufacturing the same.

First claim

What is claimed is:

1 . A colored thin film solar cell comprising:
a solar cell; and a band-stop filter provided on one surface of the solar cell, configured to reflect a portion of externally emitted light and transmit the remaining portion thereof to thereby visually change a color of the solar cell, wherein the band-stop filter is configured such that a first layer, a second layer, and a third layer are alternately stacked, and a repetition unit of the first-second-third layers is repeatedly stacked, wherein the refractive index of each of the first layer and the third layer is in a range of 1.2 to 1.6, and the refractive index of the second layer is in a range of 1.4 to 1.8, wherein each of the first layer and the third layer includes SiO 2 , and the second layer includes Al 2 O 3 , wherein the colored thin film solar cell satisfies conditions (a) and (b): (a) The band-stop filter has a reflective band half width in a range of 100 nm or less, and (b) A relational expression 1 is satisfied as follows,

0.80
≤

A
B

≤
1.00

,

[

Relational



Expression



1

]

wherein, A is light harvesting efficiency when one or more band-stop filters, each having a reflective band half width in a range of 100 nm or less, are employed, and B is light harvesting efficiency when the one or more band-stop filters are not employed.

2 . The colored thin film solar cell of claim 1 , wherein the half width is in a range of 70 nm or less.

3 . (canceled)

4 . (canceled)

5 . (canceled)

6 . The colored thin film solar cell of claim 1 wherein n is in a range of 3 to 25.

7 . The colored thin film solar cell of claim 1 , wherein the band-stop filter visually changes a color of the solar cell into one of a blue color, a green color, a yellow color, a purple color, and a red color.

8 . The colored thin film solar cell of claim 1 , wherein the band-stop filter has a reflectance of 60% or more at a central reflection wavelength thereof.

9 . The colored thin film solar cell of claim 1 , wherein the solar cell is a perovskite solar cell, a copper indium gallium selenide (CIGS) solar cell, or a silicon solar cell.

10 . (canceled)

11 . The colored thin film solar cell of claim 1 , further satisfying a condition (c):
(c) A relational expression 2 is satisfied as follows,

0.80
≤

C
D

≤
1.00

,

[

Relational



Expression



2

]

wherein C is a short circuit current density J sc when the one or more band-stop filters, each having a reflective band half width in a range of 100 nm or less, are employed, and D is a short circuit current density J sc when the one or more band-stop filters are not employed.

12 . An exterior including the colored thin film solar cell according to claim 1 .

Assignees

• Univ Kookmin Ind Acad Coop Found
• Korea Inst Sci & Tech

Inventors

• Do Young Rag
• Kim Chang Wook
• Oh Ji Hye
• Min Byoung Koun

Classifications

• H02S20/22 Primary

  specially adapted for buildings · CPC title

• H01L31/0445

  Electricity · mapped topic

• H01L31/054

  Electricity · mapped topic

• H01L31/02167 Primary

  Electricity · mapped topic

• H10F77/126

  comprising only Group I-III-VI chalcopyrite materials, e.g. CuInSe2, CuGaSe2 or CuInGaSe2 [CIGS] · CPC title