THIN FILM SOLAR CELL
A thin film solar cell includes; a first electrode, a first active layer disposed on the first electrode, a porous intermediate layer disposed on the first active layer, a second active layer disposed on the intermediate layer and a second electrode disposed on the second active layer.
1 . A thin film solar cell comprising:
a first electrode;
a first active layer disposed on the first electrode;
a porous intermediate layer disposed on the first active layer;
a second active layer disposed on the intermediate layer; and
a second electrode disposed on the second active layer.
2 . The thin film solar cell of claim 1 , wherein the intermediate layer has an average refractive index of about 2 or less.
3 . The thin film solar cell of claim 2 , wherein the intermediate layer has an average refractive index of about 1.5 to about 1.9.
4 . The thin film solar cell of claim 2 , wherein the intermediate layer is a porous thin film including a transparent conductive material.
5 . The thin film solar cell of claim 4 , wherein the transparent conductive material is a material selected from the group consisting of zinc oxide, indium oxide, tin oxide, indium tin oxide and a combination thereof.
6 . The thin film solar cell of claim 2 , wherein the intermediate layer comprises a nanostructure comprising a transparent conductive material.
7 . The thin film solar cell of claim 6 , wherein the nanostructure is selected from the group consisting of nanorods, nanowires, nanotubes and a combination thereof.
8 . The thin film solar cell of claim 7 , wherein the intermediate layer comprises pores disposed between the nanostructures.
9 . The thin film solar cell of claim 6 , wherein the transparent conductive material is selected from the group consisting of zinc oxide, indium oxide, tin oxide, indium tin oxide and a combination thereof.
10 . The thin film solar cell of claim 1 , wherein the first active layer comprises amorphous silicon, and
the second active layer comprises one of nano-crystalline silicon and micro-crystalline silicon.
11 . The thin film solar cell of claim 10 , wherein the first active layer has a thinner thickness than a thickness of the second active layer.
12 . A thin film solar cell comprising:
a first electrode;
a first active layer disposed on the first electrode;
an intermediate layer disposed on the first active layer and including at least two materials, each material of the at least two materials having a different refractive index from each other;
a second active layer disposed on the intermediate layer; and
a second electrode disposed on the second active layer.
13 . The thin film solar cell of claim 12 , wherein the intermediate layer has an average refractive index of about 2 or less.
14 . The thin film solar cell of claim 13 , wherein the intermediate layer has an average refractive index of about 1.5 to about 1.9.
15 . The thin film solar cell of claim 13 , wherein the intermediate layer comprises a mixture of a transparent conductive material and a transparent insulating material.
16 . The thin film solar cell of claim 15 , wherein the transparent conductive material is selected from the group consisting of zinc oxide, indium oxide, tin oxide, indium tin oxide and a combination thereof.
17 . The thin film solar cell of claim 15 , wherein the transparent conductive material is electrically connected to both the first active layer and the second active layer.
18 . The thin film solar cell of claim 15 , wherein the transparent insulating material is selected from the group consisting of silicon oxide, silicon nitride, magnesium fluoride and a combination thereof.
19 . The thin film solar cell of claim 12 , wherein the first active layer comprises amorphous silicon, and
the second active layer comprises one of nano-crystalline silicon and micro-crystalline silicon.
20 . The thin film solar cell of claim 19 , wherein the first active layer has a thinner thickness than a thickness of the second active layer.