NOVELTY - An indol-type compound (I), is new.    USE - New indol-type compound is used for photoelectric conversion material for photoelectric converting layer for photoelectric conversion element for organic thin-film solar cell (all claimed). Also used as pigments/dyes for optical recording layers, such as DVD-R, for optical filters used for image display apparatus such as liquid crystal display device (LCD), plasma display panel (PDP), cathode tube display apparatus (CRT), fluorescent display tube, or field emission display. Uses further include coloring agents such as color toner, ink for inkjets, and pigment/dye for coating materials. Also used in LED illuminaton, electroluminescent devices, as sensitizer for photoreactions, electrophotographic photoreceptor, color filter material, laser pigment/dye, non-linear optics material, and as pigment/dye for medical testing of drugs.    ADVANTAGE - The organic thin-film solar cell using indol-type compound-containing photoelectric conversion element has excellent photoelectric conversion efficiency.    DETAILED DESCRIPTION - An indol-type compound of formula (I), is new.    R1,R2=H or 1-40C monovalent substituent;    or R1+R2=ring;    R3-R6=H, halo, nitro, cyano, hydroxy, carboxy, -NRR', 1-20C alkyl, 6-20C aryl, 1-20C alkoxy or 6-20C aryloxy;    or adjacent R3-R6= aliphatic ring, aromatic ring, or heterocyclic ring;    R7=1-20C alkyl;    X=-CRR'-, -S-, -O-, or -NR-;    Ar=1,4-phenylene, naphthalene-2,6-diyl, naphthalene-1,4-diyl, biphenyl-4,4'-diyl, or terphenyl-4,4"-diyl (all optionally substituted by halo, nitro, cyano, hydroxy, carboxy, -NRR', 1-20C alkyl, 6-20C aryl, 1-20C alkoxy, or 6-20C aryloxy);    Ar+R1+C=ring;and    R,R'=H, 1-20C alkyl or 6-20C aryl.    INDEPENDENT CLAIMS are included for the following:    (1) photoelectric conversion material, which contains indol-type compound, p-type organic-semiconductor material, and n-type organic-semiconductor material;    (2) photoelectric converting layer, which is obtained by forming photoelectric conversion material into a film;    (3) photoelectric conversion element, which has photoelectric converting layer; and    (4) organic thin-film solar cell, which has photoelectric conversion element.