NOVELTY - A polymer comprises phenanthro(9,10-B)furan-type repeating unit.    USE - A polymer for organic semiconductor material, layer, or component used for electronic device e.g. organic LED, organic photovoltaic device, photodiode, or organic field effect transistor (all claimed).    ADVANTAGE - The polymer exhibits high energy conversion efficiency, excellent field-effect mobility and stability, and good on/off current ratio.    DETAILED DESCRIPTION - A polymer comprises phenanthro(9,10-B)furan-type repeating unit of formula (I) or (II).    R1, R2=H, F, 1-18C alkyl optionally substituted by E' and/or interrupted by D', 6-24C aryl optionally substituted by G', or 2-20C heteroaryl optionally substituted by G';    R1+R2=formula (Iaa), (Ibb), or (Icc);    R205, R206, R206', R207, R208, R208', R209, R210=H, 1-18C alkyl optionally substituted by E' and/or interrupted by D', 1-18C alkoxy optionally substituted by E' and/or interrupted by D', 1-18C fluoroalkyl, 6-24C aryl optionally substituted by G', 2-20C heteroaryl optionally substituted by G', 2-18C alkenyl, 2-18C alkynyl, 7-25C aralkyl optionally substituted by G', CN, or -CO-R28;    D'=-CO-, -COO-, -S-, -SO-, -SO2-, -O-, -NR65-, -SiR70R71-, -POR72-, -CR63=CR64-, or-CC-;    E'=-OR69, -SR69, -NR65R66, -COR68, -COOR67, -CONR65R66, -CN, CF3, or halo;    G'=E' or 1-18C alkyl optionally interrupted by -O-;    R28=H, 6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy, or 1-18C alkyl optionally interrupted by -O-;    R63, R64=6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy or 1-18C alkyl optionally interrupted by -O-;    R65, R66=6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy or 1-18C alkyl optionally interrupted by -O-;    R65+R66=5- or 6-membered ring;    R67=6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy or 1-18C alkyl optionally interrupted by -O-;    R68=H, 6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy, or 1-18C alkyl optionally interrupted by -O-;    R69=6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy or 1-18C alkyl optionally interrupted by -O-; and    R70-R72=1-18C alkyl or 6-18C aryl optionally substituted by 1-18C alkyl.    INDEPENDENT CLAIMS are included for:    (1) compound of formula A1-Y1-A3-Y15-(A4-Y16)p-(A5-Y17)q-A2 (VIII) or A1-A3-Y1-A4-(Y15-A5)p-(Y17-A5')q-A2 (IX);    (2) electronic device containing polymer, compound (VIII) or (IX), and/or organic semiconductor material, layer, or component;    (3) preparation of electronic device which involves applying solution and/or dispersion of polymer and/or compound (VIII) or (IX) in organic solvent to suitable substrate and removing solvent or evaporating compound (VIII) or (IX);    (4) compound of formula X2-A1'-A3-Y1-A4-(Y15-A5)p-(Y17-A5')q-A2'-X2' (IV) or X2-A1'-Y1-A3-Y15-(A4-Y16)p-(A5-Y17)q-A2'-X2' (V); and    (5) polymer containing repeating unit of formula A1'-Y1-A3-Y15-(A4-Y16)p-(A5-Y17)q-A2' (Xa) or A1'-A3-Y1-A4-(Y15-A5)p-(Y17-A5')q-A2' (Xb).    Y1, Y15-Y17=formula (I) or (II);    p, q=0 or 1;    A1, A2=-(Ar1)a-(Ar2)b-(Ar3)c-R10;    a-c, k', l, r, z=0, 1, 2, or 3;    R10=H, halo, CN, 1-25C alkyl optionally substituted by E'' and/or interrupted by D'', CH(CH3)=C(R214)(R215), COO-, 1-18C alkyl, 4-18C cycloalkyl group optionally substituted by G'', 2-18C alkenyl, 2-18C alkynyl, 1-18C thioalkoxy, 1-18C alkoxy optionally substituted by E'' and/or interrupted by D'', 7-25C aralkyl optionally substituted by E'', or group of formula (IVa)-(IVm);    R22-R26, R29-R58=H, halo, CN, 1-25C alkyl optionally substituted by E'' and/or interrupted by D'', 6-24C aryl optionally substituted by G'', 2-20C heteroaryl optionally substituted by G'', 4-18C cycloalkyl group optionally substituted by G'', 2-18C alkenyl, 2-18C alkynyl, 1-18C alkoxy optionally substituted by E'' and/or interrupted by D'', 7-25C aralkyl optionally substituted by G'';    R27, R28=H, 1-25C alkyl, halo, CN, or 7-25C aralkyl;    R27+R28= greater than or equal to 25C alkylene or alkenylene which may be both bonded via O and/or S to thienyl residue;    R59=H, 6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy, 1-25C alkyl optionally interrupted by O and/or S, or 7-25C arylalkyl;    D''=CO-, -COO-, -S-, -SO-, -SO2-, -O-, or -NR112''-;    E''=1-8C thioalkoxy, 1-8C alkoxy, CN, -NR112''R113'', -CONR112''R113'', or halo;    G''=E'' or 1-18C alkyl;    R112'', R113''=H, 6-18C aryl optionally substituted by 1-18C alkyl or 1-18C alkoxy, 1-18C alkyl optionally interrupted by -O-;    R214, R215=H, 1-18C alkyl, 6-24C aryl, 2-20C heteroaryl, -CN, or COOR216;    R216=1-25C alkyl, 1-25C haloalkyl, 7-25C arylalkyl, 6-24C aryl, or 2-20C heteroaryl;    Ar1-Ar7=formulas (XIa)-(XIz), (XIIa)-(XIIl), (XIV), (XVa)-(XVs), or (XVt);    A1', A2'=-(Ar1)a-(Ar2)b-(Ar3)c-;    X2, X2'=halo, ZnX12, -SnR207R208R209;    R207-R209=H or 1-6C alkyl with 2 radicals which may form common ring;    X12=halo, -OS(O)2CF3, -OS(O)2-aryl, -OS(O)2CH3, -B(OH)2, B(OY1)2, formula (X12a) or (X12b), -BF4Na, or -BF4K;    Y1=1-10C alkyl group;    Y2=2-10C alkylene group, such as, CY3Y4-CY5Y6, or -CY7Y8-CY9Y10-CY11Y12; and    Y3-Y14=H or 1-10C alkyl group.