TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The sensitizer layer comprises an organic-inorganic perovskite. The hole blocking layer comprises hole blocking material being selected from (6,6)-phenyl-C61-butyric acid methyl ester (PCBM), 1,4,5,8,9,11-hexazatriphenylene-hexacarbonitrile (HAT-CN), (C60-In)(5,6)fullerene (C60), (C70-D5h)(5,6)fullerene (C70), (6,6)-Phenyl C71 butyric acid methyl ester (PC70BM),and metal oxides. The divalent metal salts has of formula (MX2) and the trivalent metal salts has of formula (NX3), organic ammonium salts has of formula (AX, AA'X2, and BX2). The hole collector comprises a conducting layer being selected from conducting glass or conducting plastic and a conducting material being selected from indium doped thin oxide (ITO), fluorine doped tin oxide (FTO), zinc oxide-gallium oxide, zinc oxide-aluminum oxide, tin-oxide, antimony doped tin oxide (ATO), SrGeO3 and zinc oxide.M = divalent metal cation selected from Cu2+, Ni2+, Co2+, Fe2+ Mn2+, Cu2+, Pd2+, Cd2+, Ge2+, Sn2+, Pb2+, Eu2+, or Yb2+;N = Bi3+ or Sb3+;X = Cl-, Br-, I-, NCS-, CN-, or NCO-;A, A' = organic, monovalent cations selected from primary, secondary, tertiary or quaternary organic ammonium compounds, including N-containing heterorings and ring systems, 1-60C or 1-20C heteroatoms; andB = organic, bivalent cation selected from primary, secondary, tertiary or quaternary organic ammonium compounds having from 1-60 carbons and 2-20 heteroatoms and having two positively charged nitrogen atoms.Preferred Method: The step of applying the sensitizer layer is performed by deposition by sublimation process, where the sensitizer layer comprising an organic-inorganic perovskite is obtained by co-deposition of sublimated divalent metal salts or sublimated trivalent metal salts and of sublimated organic ammonium salts.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electron blocking layer comprises an electron blocking material being selected from aromatic amine of triphenylamine, carbazole, N,N,(diphenyl)-N',N'-di-(alkylphenyl)-4,4'-biphenyldiamine, (pTPDs), diphenylhydrazone, poly (N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine) (polyTPD), polyTPD substituted by electron donor groups and/or acceptor groups, poly(9,9-dioctylfluorene-alt-N-(4-butylphenyl)-diphenylamine (TFB), 2,2',7,7'-tetrakis-N,N-di-p-methoxyphenylamine-9,9'- spirobifluorene) (spiro-OMeTAD), N,N,N',N'-tetraphenylbenzidine. The conductive layer is comprises conductive material selected from poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), poly( 3,4-ethylenedioxythiophene):poly(styrenesulfonate): grapheme nanocomposite (PEDOT:PSS:graphene), poly(N-vinylcarbazole) (PVK) and sulfonated poly(diphenylamine) (SPDPA). The sensitizer layer further comprises pigment in addition to the organic-inorganic perovskite, where pigment is selected from organic pigment, organometallic pigment or inorganic pigment.