Patterning crystalline compounds on surfaces

A method of patterning the surface of a substrate with at least one crystalline compound, comprising the steps of:

• (a) providing a stamp having a surface including a plurality of indentations formed therein defining an indentation pattern, said indentations being contiguous with a stamping surface and defining a stamping pattern,
• (b) coating said stamping surface with at least one compound (C2) capable of binding to the surface of the substrate and to prevent binding of a crystalline compound,
• (c) contacting at least a portion of the surface of a substrate with said stamping surface to allow deposition of said compound (C2) on the substrate,
• (d) removing said stamping surface to provide a pattern of sites on the surface of the substrate that prevent binding of a crystalline compound,
• (e) applying a crystalline compound to the surface of the substrate to enable at least a portion of the applied crystals to bind to at least a portion of the surface of the substrate not covered with (C2).

A method for producing a substrate comprising a pattern of organic field effect transistors, each transistor comprising:

• a crystallite of an organic semiconductor (S) located on the substrate;
• a gate structure positioned to control a conductivity of a channel portion of the crystallite;
• and
• conductive source and drain electrodes located at opposite ends of the channel portion,
• wherein the positioning of the crystallites comprises the steps of:
• (a) providing a stamp having a surface including a plurality of indentations formed therein defining an indentation pattern, said indentations being contiguous with a stamping surface and defining a stamping pattern,
• (b) coating said stamping surface with at least one compound (C1) capable of binding to the surface of the substrate and also capable of binding at least one organic semiconducting compound (S),
• (c) contacting at least a portion of the surface of a substrate with said stamping surface to allow deposition of said compound (C1) on the substrate,
• (d) removing said stamping surface to provide a pattern of binding sites on the surface of the substrate,
• (e) applying a plurality of crystallites of the organic semiconducting compound (S) to the surface of the substrate to enable at least a portion of the applied crystallites to bind to at least a portion of the binding sites on the surface of the substrate.

A method for producing a substrate comprising a pattern of organic field effect transistors, each transistor comprising:

• a crystallite of an organic semiconductor (S) located on the substrate;
• a gate structure positioned to control a conductivity of a channel portion of the crystallite;
• and
• conductive source and drain electrodes located at opposite ends of the channel portion,
• wherein the positioning of the crystallites comprises the steps of:
• (a) providing a stamp having a surface including a plurality of indentations formed therein defining an indentation pattern, said indentations being contiguous with a stamping surface and defining a stamping pattern,
• (b) coating said stamping surface with at least one compound (C2) capable of binding to the surface of the substrate and to prevent binding of at least one organic semiconducting compound (S),
• (c) contacting at least a portion of the surface of a substrate with said stamping surface to allow deposition of said compound (C2) on the substrate,
• (d) removing said stamping surface to provide a pattern of sites on the surface of the substrate that prevent binding of a crystalline compound,
• (e) applying a plurality of crystallites of the organic semiconducting compound (S) to the surface of the substrate to enable at least a portion of the applied crystallites to bind to at least a portion of the surface of the substrate not covered with (C2).