TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Element: The julolidine-based dye is supported on the oxide semiconductor particles (preferably titanium dioxide as an essential element) in the presence of an inclusion compound, where the semiconductor particles has an average particle size of 1-500 nm. Preferred Cell: The dye-sensitized solar cell is prepared by coating titanium oxide on a transparent conductive substrate; subjecting the coated substrate to calcination to form titanium oxide thin film (F1); impregnating the film (F1) with mixed solution in which the dye (I) is dissolved, to form dye-absorbed titanium oxide film electrode (F2); providing second glass substrate on which counter electrode is formed; forming a hole through the second glass substrate and the counter electrode; placing thermoplastic polymer film between the counter electrode and the film (F2), and conducting heat pressing, to join the counter electrode and the film (F1); injecting an electrolyte in the thermoplastic polymer film placed between the counter electrode and the film (F1) through the hole; and sealing the thermoplastic polymer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of the julolidine-based dye (I) involves: subjecting bromojulolidine to Suzuki coupling reaction with compound of formula (II) to form compound of formula (III); lithiating the compound (III) with n-butyllithium, and then continuously cooling it with dimethylformamide to form compound of formula (IV); and reacting the compound (IV) with cyanoacetic acid in acetonitrile in presence of piperidine. SPECIFIC COMPOUNDS - 3 Compounds are specifically claimed as the julolidine-based dye (I), i.e. 2-cyano-3-(5'-(cys,cys-1,7-diethoxy-3-isopropyljulolidinyl)-2,2'-bithiophen-5-yl)acrylic acid (Ia); 2-cyano-3-(5'-(cys,cys-1,7-diethoxy-3-isopropyljulolidinyl)-3,3'-dimethyl-2,2'-bithiophen-5-yl)acrylic acid; and 2-cyano-3-(5'-(cys,cys-1,7-diethoxy-3-isopropyljulolidinyl)-2,2'-bis(3,4-ethylene-dioxythiophene)-5-yl)acrylic acid.    EXAMPLE - To anhydrous ethanol solution of 9-(2,2'-bithiophen-5-yl)-cys,cts-1,7-diethoxy-3-isopropyljulolidine (0.22 g), n-BuLi (0.35 ml) was added under argon. After 3 hours, N,N-dimethylformamide (0.05 g) was added to it at 0 degrees C under argon and washed with 5% KOH. After worked up, 9-(5'-formyl-2,2'-bithiophen-5-yl)-cys,cts-1,7-diethoxy-3-isopropyljulolidine (I'), was obtained. A mixture of the isopropyljulolidine (I') (0.38 g) and cyanoacetic acid (0.13 g) was vacuum dried, and then added to MeCN (60 ml) and piperidine (0.07 ml). The mixed solution was refluxed for 6 hours. The reaction solution was cooled; organic layer was removed under vacuum and after performing silica gel chromatogrphy, 2-cyano-3-(5'-(cys,cys-1,7-diethoxy-3-isopropyl julolidinyl)-2,2'-bithiophen-5-yl)acrylic acid (yield 51%), was obtained.