Solar Cell Apparatus and Method of Fabricating the Same

Abstract

According to the embodiment, there is provided a solar cell apparatus. The solar cell apparatus includes a back electrode layer on a substrate, a light absorbing layer on the back electrode layer, a buffer layer on the light absorbing layer, a front electrode layer on the buffer layer, and a connection part making contact with the front electrode layer, passing through the light absorbing layer, and making contact with the back electrode layer. The connection part includes a material different from a material constituting the front electrode layer.

What is claimed is: 
     
         1 . A solar cell apparatus comprising:
 a back electrode layer on a substrate;   a light absorbing layer on the back electrode layer;   a buffer layer on the light absorbing layer;   a front electrode layer on the buffer layer;   a connection part making contact with the front electrode layer, passing through the light absorbing layer, and making contact with the back electrode layer;   a first hole passing through the back electrode layer, the light absorbing layer, the buffer layer, and the front electrode layer; and   a second hole formed adjacent to the first hole while passing through the light absorbing layer, the buffer layer, and the front electrode layer,   wherein the connection part includes a material different from a material constituting the front electrode layer;   wherein a top surface of the connection part is higher than a top surface of the front electrode layer;   wherein the connection part is disposed in the second hole, and spaced apart from the back electrode layer on the first hole.   
     
     
         2 . The solar cell apparatus of  claim 1 , wherein the connection part includes metal. 
     
     
         3 . The solar cell apparatus of  claim 2 , wherein the connection part includes aluminum (Al), nickel (Ni), or silver (Ag). 
     
     
         4 . The solar cell apparatus of  claim 1 , further comprising a third hole formed beside the second hole while passing through the light absorbing layer, the buffer layer, and the front electrode layer. 
     
     
         5 . The solar cell apparatus of  claim 4 , wherein the second hole is overlapped with a third hole. 
     
     
         6 . The solar cell apparatus of  claim 1 , a width of the first hole and a width of the second hole are different. 
     
     
         7 . The solar cell apparatus of  claim 1 , further comprising an insulating part in the first hole. 
     
     
         8 . The solar cell apparatus of  claim 7 , wherein the insulating part includes a polymer or a ceramic material. 
     
     
         9 . A solar cell apparatus comprising:
 a back electrode layer on a substrate;   a light absorbing layer on the back electrode layer;   a buffer layer on the light absorbing layer;   a front electrode layer on the buffer layer;   a connection part making contact with the front electrode layer, passing through the light absorbing layer, and making contact with the back electrode layer;   a first hole passing through the back electrode layer, the light absorbing layer, the buffer layer, and the front electrode layer; and   a second hole formed adjacent to the first hole while passing through the light absorbing layer, the buffer layer, and the front electrode layer   wherein the connection part includes a material different from a material constituting the front electrode layer;   wherein a top surface of the connection part is higher than a top surface of the front electrode layer;   wherein the connection part includes a first portion overlapping with the first hole at a top surface of the front electrode layer; and a second portion overlapping with the second hole at a top surface of the front electrode layer,   wherein the first portion is spaced apart from the back electrode layer,   wherein the second portion makes contact with the back electrode layer.   
     
     
         10 . The solar cell apparatus of  claim 9 , wherein the second portion is disposed in the second hole. 
     
     
         11 . The solar cell apparatus  claim 9 , wherein the connection part includes metal. 
     
     
         12 . The solar cell apparatus of  claim 11 , wherein the connection part includes aluminum (A nickel (Ni), or silver (Ag). 
     
     
         13 . The solar cell apparatus of  claim 9 , further comprising a third hole formed beside the second hole while passing through the light absorbing layer, the buffer layer, and the front electrode layer. 
     
     
         14 . The solar cell apparatus of  claim 13 , wherein the second hole is overlapped with a third hole. 
     
     
         15 . The solar cell apparatus of  claim 9 , a width of the first hole and a width of the second hole are different, 
     
     
         16 . The solar cell apparatus of  claim 9 , further comprising an insulating part in the first hole. 
     
     
         17 . The solar cell apparatus of  claim 16 , wherein the insulating part includes a polymer or a ceramic material.