TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The step of dry-route deposition is performed: by chemical vapor deposition; and at annealing temperature of 80-120 degrees C and at pressure of (10-4)-(10-8) mbar, for 2-4 hours. The photosensitive active layer is coated with a layer made of lithium fluoride, where layer made of lithium fluoride is itself coated with an electrolytic layer made of aluminum, gold, calcium, copper, samarium, platinum, palladium, chromium, cobalt or iridium. Preferred Components: The substrate is made of oxide, and preferably made of tin-doped indium oxide, iron oxide, aluminum oxide or silicon oxide.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The film has a thickness of less than 45 nm, preferably less than or equal to 15 nm. The anode interface layer is a hole-collecting layer. The organic solar cell comprises at least one base support coated with the substrate, where the substrate is itself coated with a photosensitive active layer. In the organic solar cell: the base support is made of glass; the substrate is made of tin-doped indium oxide; and the photosensitive active layer is made of poly(3-hexylthiophene):methyl(6,6)phenyl-C61-butyrate. Preferred Definitions:    X1, X2 = O, S or Se; and    R1-R4 = phenyl, naphthyl, anthracenyl, benzoxazolyl, (alkoxy)thiophenyl, furyl, pyrrolyl, pyridyl, pyrazinyl, pyrazolyl, pyridazinyl, pyrimidinyl, triazolyl, imidazolyl, oxazolyl, indanyl, indazolyl, quinolinyl or quinoxalyl, 4-fluoro-phenyl, 4-hexyloxy-phenyl, 3,4-bis-hexyloxy-phenyl, 3,4-bis-decyloxy-phenyl, 4-dodecyloxycarbonyl-phenyl, naphthalen-2-yl or thiophen-2-yloxy.    EXAMPLE - Solution of glutaryl chloride (1.3 ml) dissolved in anhydrous dichloromethane (20 ml) was introduced into 100 ml two-necked round-bottom flask under inert atmosphere. Aluminum chloride (4.00 g) was added to the reaction mixture. Then solution of benzene (1.8 ml) dissolved in anhydrous dichloromethane (10 ml) was added drop wise and the reaction mixture was refluxed for 24 hours. The reaction mixture was worked up to give 1,5-diphenyl-1,5-pentanedione (A). Then (A) (2.52 g) was mixed with phosphorus pentasulfide (3.34 g), acetic acid (60 ml) and lithium perchlorate (6.4 g) in 100 ml two-necked round-bottom flask, and refluxed for 3 hours. The obtained reaction solution was worked up to give 2,6-diphenylthiopyrylium perchlorate (B). (B) (3.5 g) was dissolved in 200 ml of distilled acetone in a 250 ml two-necked round-bottom flask and refluxed for 2 hours under inert atmosphere. Zinc powder (1.96 g) was added portion wise and the reaction mixture was refluxed for a further 24 hours. The reaction solution was filtered, rinsed with toluene and evaporated on a rotary evaporator, and recrystallized to obtain 2,2',6,6'-tetraphenyl-4,4'-dithiopyranylidene (650 mg).