A low-molecular-weight fused polycyclic heteroaromatic compound includes a compound represented by Chemical Formula 1A, a compound represented by Chemical Formula 1B, or a combination thereof. The fused polycyclic heteroaromatic compound has a compact planar structure in which five or more aromatic rings are fused together, and thereby exhibit higher charge mobility, and furthermore, enables the use of a deposition process or a room-temperature (about 20 to about 25° C.) solution process when applied to devices, therefore realizing improved processibility.