NOVELTY - Control of deposition of organic molecules on a substrate (10) comprises forming a topography (16a-16c) of the substrate; depositing organic molecules by vapor deposition to form an organic nucleation site(s) (18a-18f) controlled by the topography; and further depositing organic molecules at the organic nucleation site by vapor deposition. The vapor deposition method is physical vapor deposition or chemical vapor deposition.    USE - The method is for controlling deposition of organic molecules on a substrate for use in an organic electronic device i.e. organic LED, organic field effect transistor, organic semiconductor laser, or photovoltaic component (claimed). The organic molecules can be deposited to form an active organic layer between an anode and a cathode of organic LED, particularly in the form of a crystalline deposit; an additional conducting layer(s), e.g. between the anode and luminescent layer; an electron donor and/or electron acceptor layer, which are arranged between anode and cathode of photovoltaic component; or organic charge-transporting channel, which is located between a source and a drain electrode and on a gate insulator of organic thin film transistor.    ADVANTAGE - Vapor deposition provides an efficient use of material, particularly raw materials such as the organic molecules. An amount of work necessary to reduce or prevent contamination, as is required when depositing the organic molecules from the solution, is reduced. Controlled deposition of organic molecules to form the organic nucleation site and further depositing organic molecules abolishes or reduces a requirement to remove organic molecules from areas of deposition other than the desired area(s). Thus, formation of the desired organic pattern (14a-14c) is cost efficient, has a reduced processing time, and provides an efficient use of material. The organic molecules of the organic nucleation site provide pi-pi interaction with further organic molecules, which lead to sites selective deposition. Layer by layer deposition of organic molecules may be achieved on amorphous substrates following formation of the nucleation sites comprising the organic molecules, so that the layers may have a highly ordered structure. Different materials, which may have different physical and/or chemical properties, can be controlled to deposit at different areas of deposition.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view representing the method of controlling deposition of organic molecules on a substrate.    Substrate (10)    Pattern (14a-14c)    Gold (16)    Topography (16a-16c)    Organic nucleation site (18a-18f)