TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Suzuki coupling reaction of boron-containing compound of formula: Q100-E1-Q200, and aryl compound of formula: T1-E2-T2 and T3-E3-T4 is carried out in the presence of a palladium catalyst and a base to obtain high molecular compound.E1=repeating unit (I);Q100,Q200=dihydroxy boryl (-B(OH)2) or boric acid ester residue;E2=repeating unit (II);andT1-T4=halo, alkyl sulfonate, aryl sulfonate, or arylalkyl sulfonate.Preferred Unit: The repeating unit (II) is of formula (II'). The repeating unit (I) is of formula (I').X2a1,X2a2=sulfur atom, oxygen atom, or selenium atom ;R21,R22,R40-R43=H or substituent;X1a1,X1a2=sulfur atom, oxygen atom, selenium atom, or -N(R)-;andR=H, halo, alkyl, alkyloxy, alkylthio, aryl, aryloxy, arylthio, arylalkyl, arylalkyloxy, aryl alkylthio, substituted amino, acyloxy, amide, aryl alkenyl, aryl alkynyl, monovalent heterocyclyl or cyano.Preferred Compound: The light absorption terminal wavelength of high molecular compound is 700 nm or more. The high molecular compound has number average molecular weight of 3000 or more by polystyrene conversion. The electron-accepting compound is fullerene derivative. EXAMPLE - 2,5-Dibromo-3-((E)-2-(5-((E)-2-(5-((E)-2-(4-hexylcyclopenta-1,3-dien-1-yl)ethenyl)thiophen-2-yl)ethenyl)thiolan-2-yl)ethenyl)thiophene (in mg) (30.6), 7-(5,9-diethyltridecan-7-yl)-4,10-bis(trimethylstannyl)-3,11-dithia-7-azatricyclo(6.3.0.02,6)undeca-1(8),2(6),4,9-tetraene (175) and 3-(5-bromothiolan-2-yl)-6-(5-bromothiophen-2-yl)-2,5-dibutyl-1H,2H,4H,5H-pyrrolo(3,4-c)pyrrole-1,4-dione (107.4) were added to flask substituted with nitrogen, and 10 ml of toluene was added. The obtained toluene solution was bubbled with nitrogen for 30 minutes. Then, tetrakis triphenylphosphine palladium (14) was added to the toluene solution, and stirred at 90 degrees C for 48 hours. Then, the flask was cooled to 25 degrees C and the reaction liquid was poured into methanol. The obtained polymer (200) was dissolved in chloroform (100 mL). The obtained solution was concentrated, and poured into methanol, and the polymer was deposited after filtering, dried and purified polymer (170) having weight average molecular weight of 41100 by polystyrene conversion and number average molecular weight of 21000. The light absorption terminal wavelength of polymer was 1030 nm.