Patent ID: 7517719

Claim:
A method of forming an organic semiconductor element having a gate electrode, a source electrode and a drain electrode, the method comprising: applying a first liquid material to a portion between the source electrode and the drain electrode, the first liquid material including a plurality of particles formed from a first organic semiconductor, the particles being covered with a capped material; removing the capping material that covers the plurality of particles by heating at a temperature of 100-150° C.; applying to the portion a solution of a second organic semiconductor, the first and second organic semiconductors being different materials, the second organic semiconductor having a lower intrinsic charge carrier mobility than the first organic semiconductor; and solidifying a resulting mixture including the particles formed from the first organic semiconductor and the solution to form a semiconductor film comprising particles of the first organic semiconductor in a matrix of the second organic semiconductor in which: (i) the volume ratio of the particles of the first organic semiconductor to the matrix of the second organic semiconductor is in the range 50:50-95:5; and (ii) the molecules of the second organic semiconductor are bonded to the particles of the first organic semiconductor by means π-π* interactions.