TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The oxide semiconductor particles comprise titanium dioxide, and have average particle size of 1-500 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): (I) is prepared by (A): subjecting 3-iodocarbazole to Stille coupling reaction with a thiophene compound of formula (2) to prepare 3-(thiophen-2-yl)carbazole or 3-(5-(thiophen-2-yl)thiophen-2-yl)carbazole (compound 3); subjecting compound (3) to Ullmann coupling reaction with 2-iodo-9,9-dimethylfluorene to prepare 9-(9,9-dimethylfluoren-2-yl)-3-(thiophen-2-yl)-carbazole or 9-(9,9-dimethyl fluoren-2-yl)-3-(5-(thiophen-2-yl)-thiophen-2-yl)carbazole (compound 4); lithiating compound (4) with n-butyllithium and then continuously cooling with dimethylformamide to prepare (9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)-thiophene-2-carbaldehyde or 5-(5-(9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)-thiophen-2-yl)thiophene-2-carbaldehyde (compound 5); and reacting compound (5) with cyanoacetic acid in methyl cyanide (CH3CN) in the presence of piperidine, or with rhodanine-3-acetic acid and ammonium acetate in acetic acid; (B) subjecting 3-iodocarbazole to Stille coupling reaction with thiophene compound (2) to prepare compound (3); subjecting compound (3) to Ullmann coupling reaction with 1-(2-(4-bromophenyl)-1-phenylvinyl)benzene to prepare 9-(4-(2,2-diphenylvinyl)phenyl)-3-(thiophen-2-yl)carbazole (compound 6); formylating compound (6) with n-butyllithium to prepare 5-(9-(4-(2,2-diphenylvinyl)phenyl)carbazol-6-yl)thiophene-2-carbaldehyde (compound 7); and reacting compound (7) with cyanoacetic acid in CH3CN in the presence of piperidine; or (C) subjecting 3-iodocarbazole to Stille coupling reaction with thiophene compound (2) to prepare compound (3); subjecting compound (3) to Ullmann coupling reaction with 2-iodo-9,9-dimethylfluorene to prepare compound (4); lithiating compound (4) with n-butyllithium and then continuously cooling with dimethylformamide to prepare compound (5); subjecting compound (5) to Horner-Emmons-Wittig coupling reaction with (2-thienhylmethyl)triphenylphosphinium bromide to prepare 9-(9,9-dimethylfluoren-2-yl)-3-(5-(2-(thiophen-2-yl)vinyl)thiophen-2-yl)carbazole (compound 8); formulating compound (8) with n-butyllithium to prepare 5-(2-(5-(9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)thiophen-2-yl)vinyl)thiophene-2-carbaldehyde (compound 9); and reacting compound (9) with cyanoacetic acid in CH3CN in the presence of piperidine. Preferred Components: The dye is supported on the oxide semiconductor particles in the presence of inclusion compound. Preferred Method: The dye-sensitized solar cell is prepared by coating a titanium oxide on a transparent conductive substrate; subjecting the coated substrate to calcination so as to form a titanium oxide thin film; impregnating the titanium oxide thin film with a mixed solution in which the dye (I) is dissolved, so as to form a dye-absorbed titanium oxide film electrode; providing a second glass substrate on which a counter electrode is formed; forming a hole through the second glass substrate and the counter electrode; placing a thermoplastic polymer film between the counter electrode and the dye-absorbed titanium oxide film electrode, and conducting heat pressing, so as to join the counter electrode and the titanium oxide film electrode; injecting an electrolyte in the thermoplastic polymer film placed between the counter electrode and the titanium oxide film electrode through the hole; and sealing the thermoplastic polymer. SPECIFIC COMPOUNDS - 6 Compounds (I) are specifically claimed, e.g. 2-cyano-3-(5-(9-(9,9-dimethyl fluoren-2-yl)carbazol-6-yl)thiophen-2-yl)acrylic acid (Ia-1); 2-cyano-3-(5-(5-(9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)thiophen-2-yl)-thiophen-2-yl)acrylic acid; 2-(5-((5-(9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)thiophen-2-yl)methylene)-4-oxo-2-thioxothiazolidin-3-yl)acetic acid; 2-(5-((5-(5-(9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)thiophen-2-yl)thiophen-2-yl)methylene)-4-oxo-2-thioxothiazolidin-3-yl)acetic acid; and 2-cyano-3-(5-(9-(4-(2,2-diphenylvinyl)phenyl)carbazol-6-yl)thiophen-2-yl)-acrylic acid.    EXAMPLE - 9-(9,9-Dimethylfluoren-2-yl)-3-(thiophen-2-yl)-carbazole (0.26 g) was dissolved in tetrahydrofuran (20 mL), and then cooled to - 78 degrees C under nitrogen gas. Then, n-butyllithium (0.92 mL) was added dropwise with vigorously stirring over 10 minutes. After the solution was allowed to reach 0 degrees C for 1 hour, it was allowed to stand at the same temperature for additional 1 hour. The solution was cooled to 78 degrees C again, and anhydrous dimethylformamide (1 mL) was added immediately. The obtained solution was allowed to reach room temperature, and then stirred overnight. Hydrochloric acid (1 mL) diluted in 20 mL water was added to the reaction solution, and then the reaction solution was extracted with diethylether. The mixed organic extracts were dried and filtered. The filtrate was subjected to silica gel chromatography to obtain (9-(9,9-dimethylfluoren-2-yl)carbazol-6-yl)-thiophene-2-carbaldehyde (compound 5). A mixture of the compound (5) (0.3 g) and cyanoacetic acid (0.082 g) was vacuum dried, and then added to acetonitrile(20 mL) and piperidine (0.063 mL), and the mixed solution was refluxed for 6 hours. The reaction solution was cooled, and an organic layer was removed under vacuum, and then the obtained solid was subjected to silica gel chromatography to obtain compound 2-cyano-3-(5-(9-(9,9-dimethyl fluoren-2-yl)carbazol-6-yl)thiophen-2-yl)acrylic acid (Ia-1) (0.19 g, 89%).