TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The conjugated molecules are stacked in an organic semiconductor film having a carrier mobility set via the pi -stacking distance, where the side chain is configured and arranged with a branching region relative to the conjugated molecule that sets the pi -stacking distance. The side chain includes a linear spacer configured and arranged to couple the siloxane-terminated unit to the conjugated molecule. The conjugated molecule includes at least one of a conjugated polymer and a conjugated oligomer. (I) further comprises a solvent. The conjugated molecule and the side chain are in solution in the solvent. The linear aliphatic chain has a structure of formula (-(CH2)n-CH2-B1), (-(C(F)2)n-CH2-B1), or (-(O-CH2-CH2)m-B1). (I) further comprises at least one heterocyclic compound of formulae (i)-(iv) bonded to (A). The side chain is configured and arranged to couple to the conjugated molecules to facilitate pi -stacking distance between the conjugated molecules that is shorter than pi -stacking distance of at least one of highly-branched 1-ethylhexyl and highly-branched 1-hexyldecyl. The side chain is configured and arranged to couple to the conjugated molecules to facilitate a pi -stacking distance between the conjugated molecules that is less than 3.7 Angstroms, or less than 3.6 Angstroms. The side chain is configured and arranged to interact with the conjugated molecule to provide a backbone having a carrier mobility of one of at least 0.5 cm2V-second-1 or at least 2 cm2V-second-1. The side chain is configured and arranged to crosslink to form a film including the conjugated molecule. The side chain includes a linear spacer bonded to the conjugated molecule and configured and arranged with bond angles and a branch site offset of the side chain that set the pi -stacking distance between the conjugated molecules. The siloxane-terminated unit is of formula (-Si((CH3)((O-Si(CH3)3)2))), (-Si((O-Si(CH3)3)(O-Si(CH3)3)2)), (Si(CH3)3-O-Si(CH3)2-O-Si(CH3)2-) or (Si-(CH3)3-O(-Si(CH3)2-O)m1-Si(CH3)2-O-Si(CH3)2-).B1 = a siloxane chain;Ar1 = a cyclic group of formulae (v)-(ix);R, R2 = linear aliphatic chain;X = O, S or Se;n = 0-12;m = 0-4; andm1 = 1-200.Preferred Method: The method further includes forming organic semiconductor film of the conjugated molecules using solution. The steps of bonding solubilizing side chains to conjugated molecules and forming the organic semiconductor film include setting at least one of a branching point of the side chain to facilitate pi -stacking distance between respective backbones, a crystallographic orientation between grains of the conjugated molecules, or a crystalline coherence length of in-plane pi -stacking between the conjugated molecules.