Inorganic hole conductor based perovskite photoelectric conversion device with high operational stability at long term

1. An optoelectronic and/or photovoltaic or photoelectrochemical device comprising a conductive support layer, n-type semiconductor, a sensitizer or light-absorber layer, a hole transporting layer, a spacer layer and a back contact, said n-type semiconductor being in contact with the sensitizer or light-absorber layer, said sensitizer or light-absorber layer comprising a perovskite or metal halide perovskite material, said hole transporting layer being in direct contact with the sensitizer or light-absorber layer and comprising an inorganic hole transporting material or inorganic p-type semiconductor, said spacer layer being between the hole transporting layer and the back contact and preventing a reaction between the inorganic hole transporting material or inorganic p-type semiconductor and the back contact, wherein the spacer layer comprises a material being different from the inorganic hole transporting material and the material of the back contact and selected from reduced graphene oxide, graphene oxide, graphene, Ni, Co, Cr, Al 2 O 3 , Cu, C (carbon), ZrO 2 , SiO 2 , SiC, Si 3 N 4 , Ca 3 (PO 4 ) 2 , insulating polymers selected from polymethyl methacrylate (PMMA), polycarbonate polymers, and boron nitride (BN).

2. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the n-type semiconductor comprises a metal oxide layer.

3. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the n-type semiconductor comprises a metal oxide layer being a compact layer onto which a mesoporous metal oxide layer being a scaffold structure for the organic-inorganic perovskite or metal halide perovskite material is provided.

4. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the n-type semiconductor comprises metal oxide particles selected from Si, TiO 2 , SnO 2 , ZnO, Zn 2 SnO 4 , Nb 2 O 5 , WO 3 , BaTiO 3 or SrTiO 3 or any combination thereof.

5. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the hole transporting layer comprises one or more inorganic hole transporting materials or inorganic p-type semiconductors selected from NiO, CuO, CuSCN, CuI CuGaO 2 , CuCrO 2 , CuAlO 2 , CsSnI 3 , MoO 3 or WO 3 or any combination thereof.

6. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the hole transporting layer comprises a film free of pinholes and having a thickness from 40 to 70 nm.

7. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the conductive support layer comprises a conductive material selected from indium tin oxide (ITO) film substrate, fluorine-doped tin oxide (FTO), film substrate, ZnO—Ga 2 O 3 film substrate, ZnO—Al 2 O 3 film substrate, tin-based oxides film substrate, antimony doped tin oxide (ATO), SrGeO 3 or zinc oxide.

8. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the back contact comprises a material selected from a metal being selected from Pt, Au, Ni, Cu, Ag, In, Ru, Pd, Rh, Ir, or Os, from porous carbon or from conductive polymers or a combination thereof.

9. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein the organic-inorganic perovskite or metal halide perovskite is selected from a perovskite structures according to any one of formulae (I), (Ia), (Ib), (Ic), (Id), (Ie), (If) and/or (Ig) below:

AA′MX 4   (I)

AMX 3   (Ia)

AA′N 2/3 X 4   (Ib)

AN 2/3 X 3   (Ic)

BN 2/3 X 4   (Id)

BMX 4   (Ie)

(A 1 ) m AA′MX 3   (If)

(A 1 ) m AMX 3   (Ig)

wherein,

A and A′ are organic, monovalent cations being independently selected from primary, secondary, tertiary or quaternary organic ammonium compounds, including N-containing heterorings and ring systems, A and A′ having independently from 1 to 60 carbons and 1 to 20 heteroatoms;

A 1 is an inorganic cation selected from Cs + , Rb + , K + and m is an integer from 1 to 3, each A l if m>1 being different;

B is an organic, bivalent cation selected from primary, secondary, tertiary or quaternary organic ammonium compounds having from 1 to 60 carbons and 2-20 heteroatoms and having two positively charged nitrogen atoms;

M is selected from Cu 2+ , Ni 2+ , Co 2+ , Fe 2+ , Mn 2+ , Cr 2+ , Pd 2+ , Cd 2+ , Ge 2+ , Sn 2+ , Pb 2+ , Eu 2+ , Yb 2+ , [Sn i Pb (1-i) ], [Sn j Ge (1-j) ] + , and [Pb k Ge (1-k) ] + , i, j and k being a number between 0.0 and 1.0;

N is selected from the group of Bi 3+ and Sb 3+ ; and,

X are independently selected from Cl − , Br − , I − , NCS − , CN − , NCO − , from [I (3-m) Cl m ] − , [I (3-n) ] − , [Br (3-u) Cl u ] − , m, n u being a number between 0.0 and 3.0, and from a combination of two anions selected from Cl − , Br − , I − .

10. The optoelectronic and/or photovoltaic or photoelectrochemical device according to claim 1 , wherein said device is selected from an organic solar cell, a solid state solar cell, from a p-n heterojunction, a phototransistor or OLED (organic light-emitting diode).

11. The optoelectronic and/or photovoltaic or photoelectrochemical device of claim 1 , wherein the spacer layer comprises a material selected from reduced graphene oxide, graphene oxide, graphene, Cr, and Al 2 O 3 .