Forming active channel regions using enhanced drop-cast printing

US8860008B2 · kind B2 · utility

Assignee

• SNU R&DB FOUNDATION · KR

Inventors

• Seonghoon Lee · Seoul, KR
• Jung Pyo Hong · Jeonju-si, KR

Key dates

• Filing date: Oct 23, 2009
• Grant date: Oct 14, 2014
• Expiry date: Mar 27, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/549

Abstract

An active region or channel for printed, organic or plastic electronics or polymer semiconductors, such as organic field-effect transistors (OFETs), is obtained by using an enhanced inkjet drop-cast printing technique. A two-liquid system is employed to achieve the direct growth of well-oriented organic crystals at the active region of channel. High-performance electrical properties exhibiting high carrier mobility and low threshold voltage are obtained due to the proper orientation of molecules in the grown crystal in a highest mobility direction, due to the absence of grain boundaries, and due to low trap densities. The hydrophobic-hydrophilic interactions between the liquids utilized, which results in the fabrication of low-cost and mass-producible printable electronic devices for applications in flexible displays, electronic signages, photovoltaic panels, membrane keyboards, radio frequency identification tags (RFIDs), electronic sensors, and integrated electronic circuits.