NOVELTY - Hydrocarbon compounds (I) are new.    USE - (I) are useful as donor groups in combination with fullerenes as acceptor groups, for producing semiconducting layers for electronic components, preferably organic solar cells (all claimed).    ADVANTAGE - (I): exhibits high sunlight absorptivity and easy processability, preferably good wet-processability.    DETAILED DESCRIPTION - Hydrocarbon compounds of formula (K1-(L-R)n) (I) are new.    n = 3-6;    R = H or unconjugated chain;    L = -(M)x-A-(M)y- (II);    x, y = 0-20;    A = acceptor group, preferably benzo(c)(1,2,5)thiadiazole-4,7-diyl moiety of formula (IIIa), thiazole-2,5-diyl moiety of formula (IIIb), thieno(2,3-d)thiazole-2,5-diyl moiety of formula (IIIc), thieno(3,2-d)thiazole-2,5-diyl moiety of formula (IIId), thiazole moiety of formula (IIIe), (2,2')bithiazolyl-5,5'-diyl moiety of formula (IIIf), pyrimidine-2,5-diyl moiety of formula (IIIg), 2,2-dicyanoethene-1,1-diyl moiety of formula (IIIh), benzo(c)(1,2,5)thiadiazole-4,7-diyl-bis(thiophene-5,2-diyl) moiety of formula (IIIi), thiadiazole moiety of formula (IIIj), substituted quinoxaline-5,8-diyl moiety of formula (IIIk), (1,3,4)oxadiazole-2,5-diyl moiety of formula (IIIl), 2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione-3,6-diyl moiety of formula (IIIm), 4-(dicyanomethylene)-4H-pyran-2,6-diyl moiety of formula (IIIn), (E)-1H,1'H-(3,3')biindolylidene-2,2'-dione moiety of formula (IIIo), substituted 2-thia-1,3,5,8-tetraaza-cyclopenta(b)naphthalene-4,9-diyl moiety of formula (IIIp), (2,2')bithiazolyl-5,5'-diyl moiety of formula (IIIq) or substituted 2H-benzoimidazole-4,7-diyl moiety of formula (IIIr);    m = 1-20;    R2 = 1-20C alkyl, preferably 1-12C alkyl (linear or branched, preferably linear and optionally interrupted by at least one O, S, silylene, phosphonoyl or phosphoryl), aromatic group (optionally substituted) or H;    M = substituted thieno(3,2-b)thiophene-2,5-diyl moiety of formula (IVa), dithieno(3,2-b;2',3'-d)thiophene-2,6-diyl, 3,4,7,8-tetrathia-dicyclopenta(a,e)pentalene-2,6-diyl, 9H-carbazole-2,7-diyl moiety of formula (IVd), 3,4,5,8,9-pentathia-cyclopenta(1,2-a;4,3-a')dipentalene-2,6-diyl, 3,7,10,13,17,20-hexathiahexacyclo(9.9.0.02,9.04,8.012,19.014,18)icosa-1(11),2(9),4(8),5,12(19),14(18),15-heptaene-6,16-diyl, 5,10-dithia-indeno(2,1-a)indene-2,8-diyl, 12,24-dithiahexacyclo(11.11.0.02,11.04,9.014,23.016,21)tetracosa-1(13),2,4,6,8,10,14(23),15,17,19,21-undecaene-6,19-diyl, 4H-cyclopenta(def)phenanthrene-2,6-diyl moiety of formula (IVi), 4H-cyclopenta(2,1-b;3,4-b')dithiophene-2,6-diyl moiety of formula (IVj), benzo(1,2-b;5,4-b')dithiophene moiety of formula (IVk), 7H-3,4-dithia-7-sila-cyclopenta(a)pentalene-2,5-diyl moiety of formula (IVl), 4H-dithieno(3,2-b;2',3'-d)pyrrole-2,6-diyl moiety of formula (IVm), 9H-fluorene-2,7-diyl moiety of formula (IVn), substituted 10,12-diphenyl-11-thia-9,13-diaza-cyclopenta(b)triphenylene moiety of formula (IVo), 9H-dibenzosilole-2,7-diyl moiety of formula (IVp), thieno(3,4-b)thiophene-4,6-diyl or thiophene-2,5-diyl moiety of formula (IVr);    R3, R4 = 1-20C alkyl, preferably 1-12C alkyl (linear or branched, preferably linear and optionally interrupted by at least one O, S, silylene, phosphonoyl or phosphoryl) or H; and    K1 = benzene-1,3,5-triyl, benzene-1,2,4,5-tetryl, benzene-1,3,5-tricarbonitrile-2,4,6-triyl, benzene-1,3,5-triyl-tris(phenyl-4-yl), benzene-1,3,5-triyl-tris(thiophene-5,2-diyl), benzene-1,2,3,4,5,6-hexyl-hexakis(phenyl-4-yl), 9,9'-spirobi(fluorene)- 2,2',7,7'-tetryl, pyrimidine-2,4,6-triyl, nitrilotris(benzene-4,1-diyl), 10,15-dihydro-5H-5,10,15-triaza-diindeno(1,2-a;1',2'-c)fluorene-2,7,12-triyl, silane-tetrayl, silanetetrayltetrakis(ethane-2,1-diyl)tetrakis(dimethylsilane-diyl), silanetetrayltetrakis(benzene-4,1-diyl), 1',3,3',4-tetrahydro-1H-spiro(silolo(3,4-c)(1 lambda 4)thiophene-2,2'-silolo(3,4-c)thiophene)-4,6,4',6'-tetryl, 5,5'-spirobi(dibenzo(b,d)silole) 3,3',7,7'-tetrayl, 2-(2-((5-(2,5-2H-1 lambda 3-thiophenylene)-2H-1 lambda 3-thiophen-2-yl)bis(5-(2,5-2H-1 lambda 3-thiophenylene)-2H-1 lambda 3-thiophen-2-yl)silyl)-2H-1 lambda 3-thiophen-5-yl)-2H-1 lambda 3-thiophen-5-yl, boranetriyltris(2,3,5,6-tetramethylbenzene-4,1-diyl), boranetriyltris(3,5-dimethylbenzene-4,1-diyl), 10,15-dihydro-5H-diindeno(1,2-a:1',2'-c)fluorene-2,7,12-triyl moiety of formula (Vs) or methanetetrayltetrakis(benzene-4,1-diyl).    Provided that if R2 is (IIIh) then R is not equal to H. An INDEPENDENT CLAIM is also included for preparing (I).