A perovskite material comprising negatively charged parts neutralized by positively charged parts ; the negatively charged parts having a general formula selected from the list consisting of: MX 3 , L n -1 M n X 3 n +1 , L n M n X 3 n +2 , and L n -1 M' n X 3 n +3 , and the positively charged parts comprising: - one or more organic ammonium cations independently selected from monovalent cations Q and divalent cations Q' , or - a polyvalent cationic conjugated organic polymer Z, wherein Q, Q' and Z comprise each a π-conjugated system in which at least 6 atoms, preferably at least 8 atoms and most preferably at least 10 atoms participate, L is a monovalent cation, M n are n independently selected metal cations M averaging a valence of two, M' n are n independently selected metal cations M' averaging a valence equal to 2 + 2/n, X is a monovalent anion, and n is 1 or larger than 1, wherein one or more X in the formulae may be substituted by a corresponding number of anions independently selected from Se 2- and S 2- if a corresponding number of divalent metal cations M or M' are replaced by a corresponding number of trivalent metal cations M or M', characterized in that the one or more organic ammonium cations are two organic ammonium cations forming together an intermolecular charge transfer complex or wherein each positively charged part comprises a further compound capable of forming an intermolecular charge-transfer complex with at least one of the one or more organic ammonium cations. the positively charged parts comprising: - one or more organic ammonium cations independently selected from monovalent cations Q and divalent cations Q' , or - a polyvalent cationic conjugated organic polymer Z, wherein Q, Q' and Z comprise each a π-conjugated system in which at least 6 atoms, preferably at least 8 atoms and most preferably at least 10 atoms participate, L is a monovalent cation, M n are n independently selected metal cations M averaging a valence of two, M' n are n independently selected metal cations M' averaging a valence equal to 2 + 2/n, X is a monovalent anion, and n is 1 or larger than 1, - one or more organic ammonium cations independently selected from monovalent cations Q and divalent cations Q' , or - a polyvalent cationic conjugated organic polymer Z, Q, Q' and Z comprise each a π-conjugated system in which at least 6 atoms, preferably at least 8 atoms and most preferably at least 10 atoms participate, L is a monovalent cation, M n are n independently selected metal cations M averaging a valence of two, M' n are n independently selected metal cations M' averaging a valence equal to 2 + 2/n, X is a monovalent anion, and n is 1 or larger than 1, wherein one or more X in the formulae may be substituted by a corresponding number of anions independently selected from Se 2- and S 2- if a corresponding number of divalent metal cations M or M' are replaced by a corresponding number of trivalent metal cations M or M', characterized in that the one or more organic ammonium cations are two organic ammonium cations forming together an intermolecular charge transfer complex or wherein each positively charged part comprises a further compound capable of forming an intermolecular charge-transfer complex with at least one of the one or more organic ammonium cations. <EOS>