NOVELTY - A fused polycyclic heteroaromatic compound (I), is new.    USE - In an organic thin film, and in an electronic device selected from transistor, an organic light emitting diode (OLED), photovoltaic device, solar cell, laser device, memory and sensor (claimed).    ADVANTAGE - The compound has an average molecular weight of 350-3000; has increased charge mobility and improved electrical properties; and enables the use of a deposition process or a room-temperature solution process when applied to devices, thus realizes improved processability. The electronic device has excellent electrical properties such as high charge mobility, and excellent processibility and workability.    DETAILED DESCRIPTION - A fused polycyclic heteroaromatic compound of formula (I), is new.    X1 and X2=O, S, Se, Te or N-R'a;    R'a=linear or branched 1-30C alkyl, 7-30C arylalkyl, 6-30C aryl, 1-30C alkoxy, 6-30C aryloxy group (-OR11), 4-30C cycloalkyl, 4-30C cycloalkyloxy group (-OR12), 2-30C heteroaryl (all are optionally substituted), acyl group (-C(=O)R13), sulfonyl group (-S(=O)R14), carbamate group (-NH2C(=O)OR15) or H;    R11=optionally substituted 6-30C aryl;    R12=optionally substituted 4-30C cycloalkyl;    R13-R15=optionally substituted 1-30C alkyl;    X3 and X4=O, S, Se, Te, N-R'b or CR'cR'd;    R'b, R'c and R'd=linear or branched 1-30C alkyl, 7-30C arylalkyl, 6-30C aryl, 1-30C alkoxy, 6-30C aryloxy group (-OR11), 4-30C cycloalkyl, 4-30C cycloalkyloxy group (-OR12), 2-30C heteroaryl (all are optionally substituted), acyl group (-C(=O)R13), sulfonyl group (-S(=O)R14), carbamate group (-NH2C(=O)OR15), or H;    R1-R9=linear or branched 1-30C alkyl, linear or branched 2-30C alkenyl, linear or branched 2-30C alkynyl, 7-30C arylalkyl, 2-30C heteroarylalkyl, 2-30C alkylheteroaryl, 5-30C cycloalkyl, 2-30C heterocycloalkyl, 6-30C aryl, 2-30C heteroaryl (all are optionally substituted), H, halo (-F, -Cl, -Br or -I);    n=0-3;    a=1 or 2.    An INDEPENDENT CLAIM is included for an electronic device, comprising the compound (I).