All-back-contact perovskite solar cells
The present disclosure relates to an all-back-contact photovoltaic device that includes, in order, a substrate, a first electrode having a first surface, an insulator, a second electrode having a second surface, and an active material, where the insulator and the second electrode form a cavity, the active material substantially fills the cavity and is in physical contact with the first surface and the second surface, the insulator includes a first layer and a second layer with the second layer positioned between the first layer and the second contact, and the first layer is constructed of a first material that is different than a second material used to construct the second layer.
1. An all-back-contact photovoltaic device comprising:
a substrate;
a first electrode comprising a first contact layer and a first charge transport layer;
a layer comprising a perovskite;
an insulator comprising a first layer and a second layer; and
a second electrode comprising a second contact layer and a second charge transport layer, wherein:
the first contact layer is positioned between the substrate and the first charge transport layer,
the insulator is positioned between the first electrode and the second electrode,
the second layer of the insulator is positioned between the first layer of the insulator and the second electrode,
the second contact layer is positioned between the insulator and the second charge transport layer,
the insulator and the second electrode form a stack covering a first portion of the first electrode,
the insulator, the second electrode, and a second portion of the first electrode form a cavity having a substantially circular cross section with a diameter between greater than 10 μm and less than or equal to 20 μm,
the layer of perovskite at least partially fills the cavity such that the layer of perovskite is in contact with both the first electrode and the second electrode,
the first layer of the insulator has a thickness between 250 nm and 450 nm and comprises silica,
the second layer of the insulator comprises alumina,
the insulator has a resistance greater than 10 9 Ohm*cm, as measured across the first layer and the second layer,
the second contact layer comprises nickel metal, and
the second charge transport layer comprises nickel oxide.
2. The device of claim 1 , wherein the first contact layer has a thickness between about 1 nm and about 100 μm.
3. The device of claim 1 , wherein the second contact layer has a thickness between about 1 nm and about 100 μm.
4. The device of claim 1 , wherein the cavity has a cross-sectional area between 315 μm 2 and 1260 μm 2 .
5. The device of claim 1 , wherein the first contact layer comprises at least one of a metal or a doped metal oxide.
6. The device of claim 5 , wherein the metal comprises at least one of gold, silver, aluminum, copper, or titanium.
7. The device of claim 5 , wherein the doped metal oxide comprises at least one of indium-doped tin oxide, aluminum-doped zinc oxide, or indium-doped zinc oxide.
8. The device of claim 1 , wherein the first charge transport material comprises an electron transport material.
9. The device of claim 8 , wherein the electron transfer material comprises at least one of TiO 2 , SnO 2 , ZnO, CeO, WO 3 , In 2 O 3 , Fe 2 O 3 , Nb 2 O 5 , C60, or PCBM.
10. The device of claim 1 , wherein the nickel oxide is in the form of a layer surrounding the nickel metal.
11. The device of claim 10 , wherein the nickel oxide is the result of oxidizing an outer portion of the nickel metal using ozone and ultraviolet light.
12. The device of claim 1 , wherein a distance between the center of the cavity and the center of a neighboring cavity is between about 1 μm and about 50 μm.
13. The device of claim 1 , wherein the thickness of the second layer of the insulator is between about 50 nm and about 150 nm.