NOVELTY - Use of a mixture comprising a component (K1) from one or more compounds e.g. substituted benzene compound (X), or 1,4-dihydro-quinoline compound (VIII), as electron donor and/or electron acceptor; and one or more compounds (K2), which are contrast to (K1), as an electron acceptor and/or electron donor, for the preparation of photoactive layer of an organic solar cell and organic photodetector, is claimed.    USE - (I) are useful for the preparation of photoactive layers of an organic photovoltaic cell and organic photodetector.    ADVANTAGE - (I) provides semiconductors with better substrate compatibility, and easily converts light energy into electrical energy.    DETAILED DESCRIPTION - Use of a mixture comprising a component (K1) from one or more compounds, which are (A-L1-X101=(L2)n=B1) (I), substituted benzene compound (X) of formula (II)-(VII), or 1,4-dihydro-quinoline compound of formula (VIII), as electron donor and/or electron acceptor; and one or more compounds (K2), which are contrast to (K1), as an electron acceptor and/or electron donor, for the preparation of photoactive layer of an organic solar cell and organic photodetector, is claimed.    A = N(R110)2, SR110 or OR110; either    R110 = H, alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6c-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl or aryl; or    R110N, R110C with carbon atom of benzene ring = 5-6 membered saturated ring;    B1 = O, S, N-CN, N-R110, C(CN)2, C(CO2R110)2, C(CN)COR110, C(CN)CO2R110, C(CN)CON(R100)2, substituted benzene group of formula (B1), 3,4-dihydro-quinazoline group of formula (B2) or nitrogen containing group of formula (B3);    L1 = divalent aryl or heteroaryl residue;    L2 = a divalent, optionally one or more annelated carbo or heterocycle having B1, X100 and/or X101 and remaining molecule part with A in pi-conjugation, or a=C(R211)-C(R101)=b;    a = connection to X101;    b = connection to X100;    n = 0 or 1;    X100 = CH, N or C(CN);    X101 = CH, N, C(CN) or X101;    L2 = 1H-isoindole group of formula (A);    d, e = connection to L1;    X200 = O, S, SO2 or NR110;    X201 = O, S, SO2, NR110 or C(R111)2;    X202 = 2H, O or S;    R100 = alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6C-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl or aryl;    R110 = H, alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6C-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl or aryl;    R111 = H, alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6C-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl, aryl or heteroaryl; either    R115 = H, alkyl, partially or perfluorinated alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6C-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl, aryl, NHCO-R100 or N(CO-R100)2; and    R210 = H or CN; or    R115R210 = an annelated benzene ring optionally substituted with R118;    R118 = H, alkyl, 1-6C-alkylene-COO-alkyl, 1-6C-alkylene-O-CO-alkyl, 1-6C-alkylene-O-CO-O-alkyl, cylcloalkyl, arylalkyl, aryl, OR110, SR110, heteroaryl, halo, NO2 or CN; and    R211 = H, CN or SCN.    Where the carbon chain of the alkyl- and cylcloalkyl are interrupted by one or two non-adjacent O; and R100 is benzannelated ring optionally substituted with R118, when X100 is CH. An INDEPENDENT CLAIM is included for the preparation of photoactive layers comprising successively or alternatively vacuum depositing (I) on a substrate