Solar cell and method of fabricating the same

摘要

Disclosed are a solar cell and a method of fabricating the solar cell. The solar cell includes a back electrode layer; a light absorbing layer on the back electrode layer; and a buffer layer on the light absorbing layer, wherein the buffer layer includes a first buffer layer, a second buffer layer on the first buffer layer and a third buffer layer on the second buffer layer, and wherein the first buffer layer includes a group I-VI compound. A method of fabricating a solar cell includes the steps of: forming a back electrode layer on a substrate; forming a light absorbing layer on the back electrode layer; forming a second buffer layer on the light absorbing layer including selenium; and forming a third buffer layer including sulfide on the second buffer layer.

主权项

1. A solar cell comprising:
a back electrode layer; a light absorbing layer on the back electrode layer; and a buffer layer on the light absorbing layer; wherein the buffer layer includes a first buffer layer, a second buffer layer on the first buffer layer, and a third buffer layer on the second buffer layer; wherein energy bandgaps sequentially decrease from the third buffer layer to the second buffer layer, wherein energy bandgap of the second buffer layer is about 1.7 eV; wherein energy bandgap of the third buffer layer is about 2.4 eV; wherein a thickness of the first buffer layer is smaller than a thickness of the second buffer layer, and the thickness of the second buffer layer is smaller than a thickness of the third buffer layer; wherein the thickness of the first buffer layer is less than 10 nm, wherein the thickness of the second buffer layer is in a range of 10 nm to 20 nm, wherein the thickness of the third buffer layer is in a range of 30 nm to 40 nm, wherein the first buffer layer includes a group I-VI compound.