Adsorption structures of thiophene on Si(1 0 0)-(2 × 1) studied by scanning tunneling microscopy and density functional theory

Room temperature adsorption of thiophene molecules on the Si(1 0 0) surface results in four configurations. The 2,5-dihydrothiophene-like species is kinetically favored and converts to the twisted-bridge tetrahydrothiophene-like species which are thermodynamically stable.