TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: (Disclosed) A fused polycyclic aromatic compound with fluorinated central benzene ring is prepared by reacting tert.-butyllithium in pentane with 1-bromo-4-hexadecylbenzene in anhydrous tetrahydrofuran, cooling, adding 2,5-difluoro-3,6-bis-(5- triisopropylsilanyl-thieno(3,2- b)thiophen-2-yl)-terephthalic acid diethyl ester in one go, warming, adding p-toluenesulfonic acid, heating, adding water, extracting with diethyl ether, drying combined organic layers over anhydrous magnesium sulfate, filtering, removing solvent in vacuo, adding strong acid 15H+ amberlyst, degassing the suspension, heating, filtering, washing solid with diethyl ether, collecting filtrate, removing solvent, and purifying crude product by silica gel column chromatography.Preferred Components: Compound of formula (I) is represented by compounds of sub-formulae (I1)-(I22).Compound of formula (I) is represented by formula asterisk-((A)x-(B')y-(C)z)n-asterisk (IV), including formulae asterisk-((Ar1-U'-Ar2)x-(Ar3)y)n-asterisk (IVa), asterisk-((Ar1-U'-Ar2)x-(Ar3-Ar3)y)n-asterisk (IVb), asterisk-((Ar1-U'-Ar2)x-(Ar3-Ar3-Ar3)y)n-asterisk (IVc), asterisk-((Ar1)a-(U')b-(Ar2)c-(Ar3)d)n-asterisk (IVd), asterisk-(((Ar1)a-(U')b-(Ar2)c-(Ar3)d)x-((Ar1)a-(Ac)b-(Ar2)c-(Ar3)d)y)n- asterisk (IVe), asterisk-((U'-Ar1-U')x-(Ar2-Ar3)y)n-asterisk (IVf), asterisk-((U'-Ar1-U')x-(Ar2-Ar3-Ar2)y)n-asterisk (IVg), asterisk-((U')b-(Ar1)a-(U')b-(Ar2)c)n-asterisk (IVh), asterisk-(((U')b-(Ar1)a-(U')b-(Ar2)c)x-((Ac)b-(Ar1)a-(Ac)b-(Ar2)d)y)n- asterisk (IVi), asterisk-((U'-Ar1)x-(U'-Ar2)y-(U'-Ar3)z)n-asterisk (IVk), and/or asterisk-(U')n-asterisk (IVm) provided that in formulae (IVd) and (IVe) in greater than or equal to 1 of repeating units ((Ar1)a-(U')b-(Ar2)c-(Ar3)d) and in greater than or equal to 1 of repeating units ((Ar1)a-(Ac)b-(Ar2)c-(Ar3)d), b is greater than or equal to 1, and in formulae (IVh) and (IVi) in greater than or equal to 1 of repeating units ((U')b-(Ar1)a-(U')b-(Ar2)a) and in greater than or equal to 1 of repeating units ((U')b-(Ar1)a-(U')b-(Ar2)d, b is greater than or equal to 1. The compound is selected from formulae asterisk-(U')n-asterisk (IV1), asterisk-((Ar1)a-U'-(Ar2)c-(Ar3)d)n-asterisk (IV2), asterisk-(((Ar1)a-U')x-((Ar2)c-(Ar3)d)y)n-asterisk (IV3), asterisk-(((Ar1)a)x-(U')y-((Ar2)c)z-((Ar3)d)w)n-asterisk (IV4), asterisk-((Ar1)a-U')n-asterisk (IV5), asterisk-((Ar1)a-U')o-((Ar1)a-U')n-asterisk (IV6), asterisk-((Ar1)a-U')o-((Ar2)c-(Ar3)d)n-asterisk (IV7), and/or asterisk-((Ar)a)o-(U')p-((Ar2)c)n-((Ar3)d)q-asterisk (IV8). The compound is represented by formula R21-chain-R22 (V). The compound is a small molecule or oligomer of formula RT1-(Ar7)h-(Ar6)g-((Ar5)f-(Ar4)e-U'-(Ar8)i- (Ar9)k)t-(Ar10)l-(Ar11)m-RT2 (VII). The compounds in the composition or polymer blend are n-type organic semiconductor compounds, preferably optionally substituted fullerene.A,B',C'=formulae (I), (IIa), (IIb), (IIIa), or (IIIb);w-z=0-1;x+y+z=1;n,o,p,q= greater than or equal to 1;chain=polymer chain of formulae (IV), (IVa)-(IVm), or (IV1)-(IV9);R21,R22=Rs, H, F, Br, Cl, I, -CH2CI, -CHO, -CR'=CR''2, -SiR'R''R''', -SiR'X'X'', -SiR'R''X', -SnR'R''R''', -BR'R'', -B(OR')(OR''), -B(OH)2, -O-SO2-R', -CCH, -CC-SiR'3, -ZnX', or endcap group; X',X''=halo;R',R'',R'''=R0 provided that 2 of R', R'', and R''' may also form cyclosilyl, cyclostannyl, cycloborane, or cycloboronate with 2-20 C atoms together with respective hetero atom to which they are attached;Ar4-Ar11=-CY1=CY2, -CC-, or 5-30C aryl or heteroaryl optionally substituted by Rs provided that greater than or equal to 1 of Ar4-Ar11 are U';RT1,RT2=H, F, CI, Br, -CN, -CF3, R, -CF2-R, -O-R, -S-R, -SO2-R, -SO3-R -C(O)-R, -C(O)-H, -C(S)-R, -C(O)-CF2-R, -C(O)-OR, -C(S)-OR, -O-C(O)-R, -O-C(S)-R, -C(O)-SR, -S-C(O)-R, -C(O)NRR', -NR'-C(O)-R, NHR,-NRR', -SO2-R, -CR'=CR''R'', -CC-R', -CC-SiR'R''R''', -SiR'R''R'''', -CH=CH(CN), -CH=C(CN)2, -C(CN)=C(CN)2, CH=C(CN)(Ar12), -CH=C(CN)-COOR, -CH=C(COOR)2, CH=C(CON RR')2, or formula (iii);Ra',Rb'=4-30C aryl or heteroaryl optionally substituted by R or R1;Ar12=4-30C aryl or heteroaryl optionally substituted by R1; R=(cyclic) 1-30C alkyl optionally substituted by F or Cl, or CN groups, or perfluorinated and in which greater than or equal to 1 C atoms are optionally replaced by -O-, -S-, -C(O)-, -C(S)-, -SiR0R00-, -NR0R00-, -CHR0=CR00-, or -CC- such that O- and/or S-atoms are not directly linked to each other;e,f,g,h,i,k,l,m=0 or 1;e+f+g+h+i+k+l+m=1; andt=1-2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: Compound of formula (I) is a conjugated polymer comprising greater than or equal to 1 units of the compound. The polymer further contains units of formulae -((Ar1)a(U')b-(Ar2)c-(Ar3)d)- (IIa) or -((U')b-(Ar1)a-(U')b-(Ar2)c-(Ar3)d)- (IIb) provided that the polymer contains greater than or equal to 1 repeating unit of formulae (IIa) or (IIb), where b is greater than or equal to 1. The polymer additionally contains repeating units of formulae -((Ar1)a-(Arc)b-(Ar2)c-(Ar3)d)- (IIIa) or -((Ac)b-(Ar1)a-(Ac)b-(Ar2)c-(Ar3)d)- (IIIb) provided that the polymer contains greater than or equal to 1 repeating unit of formulae (IIIa) or (IIIb), where b is greater than or equal to 1. The monomer is selected from formulae R23-U'-R24 (VI1), R23-Ar1-U'-R24 (VI2), R23-U'-Ar2-R24 (VI3), R23-U'-Ar1-U'-R24 (VI4), R23-Ar1-U'-Ar2-R24 (VI5), or R23-U'-Ac-R24 (VI6).U'=unit of formula (I) or its sub-formulae;a-c=0, 1, or 2;d=1-10; andAc=aryl or heteroaryl. Preferred Definitions:    R1,R2,Rs=1-30C alkyl, 1-30C alkoxy, 1-30C sulfanylalkyl, 1-30C sulfonylalkyl, 1-30C alkylcarbonyl, 1-30C alkoxycarbonyl, and/or alkylcarbonyloxy optionally substituted by F atoms without being perfluorinated, or 4-30C aryl or heteroaryl optionally substituted by greater than or equal to 1 Rs groups;    Ar21-Ar24=non-terminal ring selected from group of formula (i), or terminal ring selected from group of formula (ii);    W'=S, O, or Se;    V'=CR1 or N;    R3-R7=R1; and    A1,A4,A6,A7=single bond.    SPECIFIC COMPOUNDS - 2 Compounds (I) are disclosed, e.g. formulae (1) and (2).    EXAMPLE - Tert.-butyllithium (27.8 ml, 1.7 M in pentane) was added to a suspension of 1-bromo-4-hexadecylbenzene (9 g) in anhydrous tetrahydrofuran (300 ml) at - 78 degrees C dropwise over 45 minutes. Reaction mixture was stirred at - 78 degrees C for 20 minutes before warming to - 40 degrees C, stirred for 40 minutes, and cooled to - 78 degrees C. 2,5-difluoro-3,6-bis-(5-triisopropylsilanyl-thieno(3,2- b)thiophen-2-yl)-terephthalic acid diethyl ester (4 g) was added in one go. The mixture was allowed to warm to 23 degrees C for 17 hours. P-toluenesulfonic acid (2 g) was added to the mixture in one go, and mixture was heated to 50 degrees C for 4 hours. Water (400 ml) was added, and mixture was stirred at 23 degrees C for 30 minutes. The product was extracted with diethyl ether (3x 100 ml). The combined organic layers were dried over anhydrous magnesium sulfate and filtered, and the solvent was removed in vacuo to obtain crude intermediate product as yellow oily residue. Strong acid 15H+ amberlyst was added to solution of intermediate product in anhydrous toluene (100 ml). The suspension was degassed for 30 minutes, and the mixture was heated to 70 degrees C for 5 hours and filtered, and the solid washed with diethyl ether (300 ml). Filtrate was collected, and solvent was removed in vacuo. Crude product was purified using silica gel column chromatography (cyclohexane:chloroform 8:2 at 50 degrees C). Fractions containing pure product were combined, and solvent was removed in vacuo to afford compound (1) (495 mg, 11% yield) as yellow solid.