Synthesis And Characterizations Of Novel Fused-ring Organic Small Molecules For Field-effect Transistor

OFETs show great promising applications in various of display and storage devices due to their excellent property which can be fabricated at low-cost, flexible substrates and on large areas. After the development in recent years, OFETs is already in the forefront of industrialization. Organic semiconductor material is a critical part of OFETs, and has been attracted great attention. A large number of semiconductor materials of high stability and migration have been synthesized and reported. And some materials can be comparable with amorphous silicon. Small organic molecule is an important kind of organic semiconductor materials and affects directly on the application of the field-effect transistor. At present, the organic small molecule semiconductor materials which exhibit excellent comprehensive properities are still relatively scared. Herein, we have designed and synthesized some new small molecular semiconductor materials with hybrid and fused-ring for field-effect transistor. The main results are summarized:1, Six-member heteroacene derivative benzothiophene (DBTTA) was designed and synthesized. The UV-vis spectrum exhibited the highest absorbance peak of366nm in CH2Cl2dilute solution and an energy gap was3.3eV which calculated by the UV-vis spectrum starting edge. High thermal stability for DBTTA was tested by TGA in nitrogen atmosphere.2、Six-and seven-member heteroacene derivatives with n-hexyl branched chain(C6-DBTTA、C6-DB5T) were designed and synthesized. Their energy gap were3.2eV and3.0which were calculated by the UV-vis spectrum, and with the highest absorbance peak of373and392nm in CH2Cl2dilute solution. C6-DBTTA and C6-DB5T both exhibited high thermal stability tested by TGA in nitrogen atmosphere.C6-DBTTA and C6-DB5T exhibited high mobility up to7.20×10-2cm2/(Vs) and1.03×10-2cm2/(Vs). 3、A two-dimensional fused-ring compounds BBBTBBT was designed and synthesized. BBBTBBT has the highest absorbance peaks at347nm, and the energy gap was2.9eV which was calculated by the UV-vis spectrum. Moreover, BBBTBBT exhibited very high thermal stability which degraded from534℃tested by TGA. BBBTBBT exhibited high mobility up to4.43x10-4cm2/(Vs).