Surface treatments for perovskite films to improve efficiency/stability of resulting solar cells
AssigneeThe University of North Carolina at Chapel Hill
InventorsYuze Lin, Ye Liu, Shangshang Chen, Jinsong Huang
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Abstract
Described herein are surface treatment methods for removing one or more surface defect layers from polycrystalline films, polycrystalline films that are free of one or more defect surface layers, and use of the films in solar cells. In certain embodiments, the method is conducted by means of an adhesive tape or mechanical polishing. As described herein, solar cells containing the surface treated perovskite films show enhanced efficiency and stability.
Claims35
A polycrystalline perovskite film comprising a perovskite composition of formula ABX3 or A2BX4, wherein,
- A is selected from the group consisting of methylammonium (MA), tetramethylammonium, formamidinium (FA), cesium, rubidium, potassium, sodium, butylammonium, phenethylammonium, phenylammonium, guanidinium, ammonium, and a combination thereof;
- B is a metal cation selected from the group consisting of lead, tin, calcium, cadmium, germanium, zinc, nickel, platinum, palladium, mercury, titanium, silicon, and a combination thereof;
- and
- X is selected from the group consisting of Cl−, Br−, F−, I−, SCN−, and a combination thereof;
- wherein said polycrystalline perovskite film is free of one or more surface defect layers.
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