TECHNOLOGY FOCUS - ELECTRONICS - Preferred Properties: The siloxane group molecular film is fixed on a substrate (25) by a chemical bond. The molecular film has a structure of single monolayer or single molecule built-up film. The molecular film is formed by orientation of organic group B'. Preferred Device: The organic device obtained using the siloxane group molecular film contacts with a gate insulating film (23) formed on a gate electrode (24). The organic device is an organic thin-film transistor having a source electrode (21), a drain electrode (22), and a non-contacting semiconductor layer (20). The semiconductor layer and/or the gate insulating film are siloxane group molecular films. Or, the organic device is an organic photoelectric transducer having an organic layer between a transparent electrode and a counter electrode. The organic layer is the siloxane group molecular film. Or, the organic device is an organic electroluminescent element having an organic layer between an anode and a cathode.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: Alternately, the silicon-containing organic compound is obtained by converting a dihalo compound of formula: X1-B'-X2 into a Grignard reaction agent using a metal catalyst consisting of magnesium or lithium, reacting with a halogenated silicon-containing compound of formula: Y1-Si(A1)(A2)(A3) to obtain Grignard reaction agent of formula: Si(A1)(A2)(A3)-B'-MgX2, and reacting with compound of formula: Y2-Si(A4)(A5)(A6).B',Y1,A1-A6,Y2=as mentioned above;andX1,X2=halogen.A single monolayer is formed on a substrate by reacting a silyl group (A1-A3) and the substrate surface. The unreacted organic compound is removed by washing using a non-aqueous solvent. A siloxane network is formed by hydrolysis reaction and condensing reaction of unreacted silyl group existing in the film surface side of the obtained monolayer. The monolayer is accumulated considering unreacted hydroxyl group in film surface in which siloxane network is formed, as site of adsorption reaction. The substrate has hydroxyl group on the surface. Preferred Definitions:    B'=group derived from linear monocyclic group aromatic compound, linear condensed system aromatic compound, linear monocyclic group heterocyclic compound, linear condensed system heterocyclic compound, linear saturated fat group compounds, or compound having 2-30 bonding, preferably linear monocyclic group aromatic compound, linear monocyclic group heterocyclic compound, linear saturated fat group compound, compound having 2-30 bonding, or linear condensed system aromatic compound;    A1-A3=halogen or 1-2C alkoxy;and    A4-A6=3-4C alkoxy or 3-8C alkyl.