Study on 6,13-bis(triisopropylsilylethynyl) (TIPS) Pentacene Crystalline Morphology for Organic Thin Film Transistor

摘要

We found that the crystallization of TIPS pentacene thin film plays an important role in determining the electrical property of organic thin film transistor (OTFT). OTFTs were fabricated using two different TIPS pentacenes, namely big grains and dendrite grains. Poly-4-vinylphenol (PVP) was used as a gate insulator, and Au electrode was evaporated using a shadow mask. The channel lengths of OTFTs with the bottom gate structure were 20-40 um. The mobility values of OTFTs fabricated with big grains reveal ten time higher values than those obtained from OTFTs fabricated with dendrite grains. The physical properties of the TIPS pentacene films were analyzed using optical microscope (OM), x-ray diffraction (XRD) and secondary electron microscopy (SEM). The electric characteristics of OTFT were obtained using Keithley-4200.