Molecular bottom-up methods for fabricating perovskite solar cells, perovskite materials fabricated thereof, and optoelectronic devices including same
View Patent ↗Disclosed is a building blocks method for low-cost fabrication of single crystal organometallic perovskite materials with pseudo crystallized hole transporting material layer. This method uses self-assembled molecular monolayers SAM as building blocks. This approach enables creation of defect-free perovskite crystals with desired morphology and crystallinity in a controlled way. Additionally, the crosslinked molecular layers SAM play a role of hole transporting materials HTM and encapsulation against diffusion of metal atoms and gas molecules, thus enhancing the stability of the perovskite materials. This method is cost effective and can be scaled up.
1. A perovskite device comprising:
a substrate comprising a metallic material;
a cross-linked self-assembled molecular monolayer on top of the substrate;
a perovskite material on top of the cross-linked self-assembled molecular monolayer, wherein the perovskite material is grown on the cross-linked self-assembled molecular monolayer to create uniform and defect free perovskite single crystal; and
an electron-collector electrode deposited on top of the perovskite material,
wherein the cross-linked self-assembled molecular monolayer comprises crosslinked self-assembly molecules terminated with sulfur
wherein the cross-linked self-assembled molecular monolayer functions as a hole transporting layer so that the perovskite device operates without a separate organic hole transport layer.
2. The perovskite device of claim 1 , wherein the perovskite material comprises a single-crystal layer of MAPbX 3 , where X is Cl, Br, or I.
3. The perovskite device of claim 1 , wherein the substrate comprises a material selected from the group consisting of gold, silver, copper, platinum, zinc, nickel, graphene, iron, carbon-nanotube, aluminum, and combinations thereof.