Patent ID: 8758508

Claim:
A method of forming a thin film in molecular organic semiconductor material (OSCM) intended to be integrated in a device for electronic or opto-electronic applications, comprising the following steps: (a) providing a determined quantity of molecular OSCM in the form of a melt on the surface of a carrier so as to form a thin film; (b) cooling as per a determined temperature profile to cause solidification of the thin film; wherein the temperature of the carrier surface is equal to or higher than the melting point of the molecular OSCM at the time step (a) is conducted, and wherein the temperature profile for step (b) comprises: a first part corresponding to controlled, sufficiently slow cooling of the molecular OSCM down to a temperature close to the crystallization temperature of the molecular OSCM, so as only to cause one seed to appear in the thin film in melt form; and a second part corresponding to controlled cooling so that at least one single-crystal domain grows from this seed, the thin film finally obtained being single crystalline.