Selective Crystallization of Organic Semiconductors for High Performance Organic Field-Effect Transistors

The patterning of an organic layer, a big challenge for organic field-effect transistors (OFETs), have recently received considerable attention. By using copper tetracyanoquinodimethane (Cu-TCNQ) modified copper electrodes with nanostructure, selective polycrystalline growth of organic semiconductors is achieved. For different organic semiconductors, varied ways for crystal growth are observed. The OFETs based on selectively deposited tetracyanoquinodimethane (TCNQ), rubrene, and copper phthalocyanine crystals are fabricated and exhibit good device performance. Rubrene devices exhibit maximum field-effect mobility up to 4.6 cm 2 /(V·s) which is comparable to that of corresponding single crystal device. In addition, an organic inverter made of patterned rubrene and TCNQ exhibits a gain of 23. These results offer a general approach to the fabrication of high performance OFETs and organic circuits.