A thiaxanthenothiaxanthene compound of Formula (I): wherein R1 to R10 are independently selected from the group consisting of hydrogen, an alkyl group, a substituted alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, a substituted alkenyl group, an ethynyl group, a substituted ethynyl group, an aryl group, a substituted aryl group, a heteroaryl group, a substituted heteroaryl group, a trialkylsilyl group, a fluorohydrocarbon group, a cyano group and a halogen; and wherein the semiconductor of Formula (I) is predominantly crystalline or liquid crystalline. The compounds are designed to ensure air stability, good solubility, and high mobility.