Photovoltaic cell comprising a perovskite layer
A photovoltaic cell comprising at least one photovoltaic absorber layer based on lead halide perovskite comprising, in turn, a lead halide perovskite layer and a protection edge arranged so as to peripherally at least partially surround the lead halide perovskite layer and consisting of a material having at 25° C. a solubility in water that is equal to or smaller than 5*10-4 mol/kg. The protection material is exclusively present in the protection edge.
1 . A photovoltaic cell, comprising
at least one lead halide perovskite layer;
a protection edge arranged so as to peripherally surround said at least one lead halide perovskite layer;
wherein said protection edge has a height equal to that of the at least one lead halide perovskite layer and a width ranging from 0.02 mm to 2 mm, and consisting of a protection material having a solubility in water at 25° C. that is equal to or smaller than 5*10{circumflex over ( )}-4{circumflex over ( )} mol/kgH2O;
wherein said protection material is exclusively present in said protection edge;
wherein said protection material is selected from a group consisting of: poorly soluble inorganic perovskites and a lattice structure other than perovskite and comprising lead halides and bulky cations.
2 . The photovoltaic cell according to claim 1 , wherein that said protection edge has a width ranging from 0.05 mm to 1 mm.
3 . The photovoltaic cell according to claim 1 , wherein said protection material has a resistivity greater than or equal to 10{circumflex over ( )}5{circumflex over ( )} Ωcm at 25° C.
4 . The photovoltaic cell according to claim 3 , wherein said protection material is an inorganic material comprising lead.
5 . The photovoltaic cell according to claim 4 , wherein said protection material is chosen from a group consisting of: PbSO4, Pb3(PO4)2, PbCO3, PbS, PbO and PbO2.
6 . The photovoltaic cell according to claim 1 , wherein said photovoltaic cell is a perovskite/silicon tandem solar cell.
7 . A method for manufacturing a protection edge of a photovoltaic cell according to claim 1 ,
wherein the method comprises exposing an edge portion of the lead halide perovskite layer or of a synthetic precursor thereof to a solution containing an anion or to an oxidizing agents.
8 . The method according to claim 7 , wherein that said exposing is carried out by a member of a group consisting of a screen printing process, an inkjet printing process and a spray coating process.