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2015 MRS fall Meeting, Boston, USA

November 29 - December 4, 2015 (Mon - Fri), John B. Hynes Veterans Memorial Convention Center

 

MRS1.jpg

<Poster Session : BB3-32>

Photolithography-Adaptive Organic Semiconductors for High-Resolution Flexible Tandem Electronics

Han wool  Park1, Keun-Yeong  Choi2, Hojin  Lee2, Do Hwan  Kim1

 

 

Abstract

Organic electronics has recently attracted a great deal of interest because of its solution-processed potential applications in flexible, wearble, and even stretchable devices. This, however, serves as a trade-off when one tries to implement these processes in assembling practical electronic devices, since the as-deposited films would be fragile to subsequent solution processes. Consequently, conventional photolithography is hardly applicable to solution-processed organic semiconductor layers for getting high-resolution pattern. In this talk, we demonstrate the whole new type of organic materials based on sol-gel chemistry, which is capable of remarkably showing chemical and mechanical stability during photolithography process. The critical step in a sol-gel reaction is the formation of a highly cross-linked network out of molecular precursors through hydrolysis and condensation reactions. By carefully manipulating this step, we could prepare self-assembled structures of either quasi-3D random or ladder characteristics. The resulting structures yielded films that are highly tolerant against harsh external stimuli. Moreover, the peculiar topology of organometallic gel network containing with molecular pores could be successfully utilized as a template to form a heterogeneous interpenetrated network (HIPN) with functional electronic organic units. As a result, we could achieve micron scaled patterns of organic semiconductor through the standard photolithography. Based on electrical properties of thin-film transistors with patterned organic semiconductor layers, we successfully designed and demonstrated a CMOS inverter circuit with micro-patterned n- and p-type channels based orthogonal organic semiconductor gels through sequential solution processes.

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