TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: The photovoltaic solid state device further comprises organic-inorganic perovskite as sensitizer in the form of layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Composition: The sensitizer layer made of organic-inorganic perovskite is coated by a layer comprising the compound (I). The organic-inorganic perovskite layer material comprises a perovskite-structure of formulae: AA'MX4, AMX3, AA'N'2/3X4, AN'2/3X3, B'N'2/3X4 or B'MX4.A,A'=organic, monovalent cations chosen from primary, secondary, tertiary or quaternary organic ammonium compounds including N-containing heteroring, and has 1-60 carbons and 1-20 heteroatoms;B'=organic, bivalent cation chosen from primary, secondary, tertiary or quaternary organic ammonium compounds having 1-60 carbons and 2-20 heteroatoms and two positively charged nitrogen;M=divalent metal cation chosen from Cu2+, Ni2+, Co2+, Fe2+, Mn2+, Cr2+, Pd2+, Cd2+, Ge2+, Sn2+, Pb2+, Eu2+ and Yb2+;N'=Bi3+ or Sb3+;andX=Cl-, Br-, I-, NCS-, CN-, or NCO-. SPECIFIC COMPOUNDS - 2 Hexacyclic compounds i.e. 4-(10-(11,17-bis(7,7-dihexyl-10-(7-(5-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazol-4-yl)-3,11-dithia-7-silatricyclo(6.3.0.02,6)undeca-1(8),2(6),4,9-tetraen-4-yl)-8,8,14,14,22,22-hexamethyl-1-azahexacyclo(11.7.1.13,19.02,7.09,21.015,20)docosa-2,4,6,9,11,13(21),15(20),16,18-nonaen-5-yl)-7,7-dihexyl-3,11-dithia-7-silatricyclo(6.3.0.02,6)undeca-1(8),2(6),4,9-tetraen-4-yl)-7-(5-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazole of formula (Ia), and 4-(10-(11,17-bis(7,7-dihexyl-10-(7-(5-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazol-4-yl)-3,11-dithiatricyclo(6.3.0.02,6)undeca-1(8),2(6),4,9-tetraen-4-yl)-8,8,14,14,22,22-hexamethyl-1-azahexacyclo(11.7.1.13,19.02,7.09,21.015,20)docosa-2,4,6,9,11,13(21),15(20),16,18-nonaen-5-yl)-7,7-dihexyl-3,11-dithiatricyclo(6.3.0.02,6)undeca-1(8),2(6),4,9-tetraen-4-yl)-7-(5-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazole are disclosed.    L=group of formula (a).    EXAMPLE - 0.21 mL n-Butyllithium in 1.6 M hexane was dripped to anhydrous tetrahydrofuran solution containing 0.06 g 2,6,10-tribromo-4,4,8,8,12,12-hexamethyl-4H,8H,12H-benzo(1,9)quinolizino(3,4,5,6,7-defg)acridine under nitrogen atmosphere at -78 degrees C. After 1 hour stirring at -78 degrees C, 0.33 ml trimethyltin chloride in 1 M tetrahydrofuran solution was added slowly to the reaction solution. The reaction mixture was heated to room temperature and stirred for overnight. Then, the reaction mixture was quenched with brine. The resulting solution was extracted with dichloromethane, and dried with magnesium sulfate. 2,6,10-Trimethylstannyl-4,4,8,8,12,12-hexamethyl-4H,8H,12Hbenzo(1,9)quinolizino(3,4,5,-6,7,-defg)acridine was obtained without any purification. 0.36 g 4-(5-Bromo-3,3'-dihexylsilylene-2,2'-bithiophene)-7-(5"-n-hexyl-(2,2';5,2"-terthiophene)-5-yl)-benzo(c)-(1,2,5)thiadiazole, 0.085 g 2,6,10-trimethylstannyl-4,4,8,8,12,12-hexamethyl-4H,8H,12H-benzo(1,9)quinolizino(3,4,5,6,7-defg)acridine, 0.012 g tetrakis(triphenylphosphine)palladium(0) and 50 mL anhydrous toluene were added to 125 mL flame-dried 2-neck round bottom flask under a nitrogen atmosphere. The reaction mixture was heated to reflux for 2 days. The reaction mixture was then cooled to room temperature. The organic layer was separated and dried over anhydrous magnesium sulfate. The solvent was removed. The residue was purified and tris((4-(3,3'-dihexylsilylene-2,2'-bithiophene)-7-(5"-n-hexyl-(2,2';5',2"-terthiophene)-5-yl)-benzo(c)-(1,2,5)thiadiazole)-2,6,10-yl)-4,4,8,8,12,12-hexamethyl-4H,8H,12H-benzo(1,9)quinolizino (3,4,5,6,7,-defg)acridine was obtained as orange product having melting point of 97 degrees C with yield of 60%.