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

概要

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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 5 μm. 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\times 10^{-2} cm<sup>2</sup>/(V\cdots) which was almost 100 times higher than that based on the film deposited using the toluene:ethanol mixed solvent [2.0\times 10^{-4} cm<sup>2</sup>/(V\cdots)].
The Japan Society of Applied Physicsの論文
2013-05-25