Fabrication of 6,13-Bis(triisopropylsilylethynyl) Pentacene Films by Electrostatic Spray Deposition for Bottom-Contact Organic Field-Effect Transistors

摘要

In this study, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) films were prepared by electrostatic spray deposition (ESD) for fabrication of bottom-contact organic field-effect transistors (OFETs) having the channel length of 5μm. Since the crystalline quality of TIPS pentacene film strongly depends on the nature of the spray droplets, we investigated preparation condition of TIPS pentacene solution with mixed organic solvents. Large crystal domains were obtained by using a 1,2-diclorobenzene (o-DCB):ethanol mixed solvent. On the other hand, the film deposited using the toluene:ethanol mixed solvent was composed of small domains. Due to larger crystal domains obtained in the film deposited using the o-DCB:ethanol mixed solvent (i.e., reducing domain boundaries), we could fabricate the bottom-contact OFET exhibiting the field-effect mobility of 1.6 × 10~(-2) cm~2/(V·s) which was almost 100 times higher than that based on the film deposited using the toluene:ethanol mixed solvent [2.0 × 10~(-4) cm~2/(V·s)].