TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Semiconductor: The semiconductor is metal oxide or metal sulfide semiconductor. Preferred Definitions:    Z,Z' = group of formula (a-d) or group of formula (Cp-1 to (Cp-3), (Cp-5) or (Cp-13 to Cp-15);    R4,R5 = H or substituent;    Z2 = same as Z;    asterisk = bonding site with squarylium ring or croconium ring;    R61 = alkyl, aryl, heterocyclic, acylamino, amino, carboxyl, alkoxyl, aryloxy, alkylthio, arylthio, ureido or alkoxy carbonyl amino group;    R62 = alkyl, aryl or heterocyclic group;    R63,R64 = H, alkyl, alkenyl, aryl, heterocyclic, acyl amino, alkyl sulfonyl amino, aryl sulfonyl amino, amino, alkylamino, alkyl thio, aryl thio, alkoxy, aryloxy, ureido, alkoxy carbonylamino, carbamoyl, carboxyl or alkoxycarbonyl;    R65,R67,R85,R86 = H, alkyl, aryl, heterocyclic, acylamino, alkyl sulfonyl amino, aryl sulfonyl amino, amino, alkylthio, arylthio, alkoxyl, aryloxy, ureido, alkoxy carbonylamino, acryl, carboxyl, alkoxycarbonyl or carbamoyl group;    R87,R88 = H, alkyl, aryl, heterocyclic, carbamoyl, alkoxycarbonyl, aryloxy carbonyl, carboxyl, cyano, sulfamoyl, alkyl sulfonyl, aryl sulfonyl or nitro group;    R89 = H, alkyl, aryl or heterocyclic group.    SPECIFIC COMPOUNDS - One hundred and four dioxoanion pigments are disclosed such as compounds (I-1), (I-2) having general formula (A).    Q, Q' = 1 for formula (I-1) and 3 for formula (I-2);    EXAMPLE - Titanium tetraisopropoxide (62.5 ml) was added to pure water (375 ml) at room temperature for 10 minutes, and stirred vigorously. A white precipitate was produced. 70% nitric acid aqueous solution (2.65 ml) was added and heated at 80 degrees C. Stirring was continued for 8 hours and concentrated until volume of reaction mixture was 200 ml. Titanium oxide powder (140 g) and pure water (125 ml) was added to the mixture and a titanium oxide suspension (800 ml) was prepared. The suspension was applied on transparent electroconductive glass panel coated with tin oxide which doped fluorine, and baked at 300 degrees C for 60 minutes after drying. A film-like titanium oxide was formed on the support. Subsequently, a solution of compound (I-1) (5 g) and methanol (200 ml) was prepared. The support was immersed into the solution. Trifluoroacetic acid (1) was added and ultrasonic irradiation was carried out for 2 hours. A photosensitive layer was formed on the support which was washed and vacuum dried. An opto-electric transducer was produced using the photosensitive layer, a counter electrode (tin oxide doped with fluoride), and a charge transfer layer. The opto-electric transducer was sealed using a resin. A lead wire was attached and a solar cell was obtained. The solar cell had excellent photoelectric conversion characteristics.