Transparent ring oscillator based on indium gallium oxide thin-film transistors

Abstract Highly transparent ring oscillators, exhibiting ∼75% optical transmittance in the visible portion of the electromagnetic spectrum, are fabricated using indium gallium oxide as the active channel material and standard photolithography techniques. The n-channel indium gallium oxide transparent thin-film transistors (TTFTs) exhibit a peak incremental mobility of ∼7 cm 2  V −1  s −1 and turn-on voltage of ∼2 V. A five-stage ring oscillator circuit (which does not employ level-shifting) exhibits an oscillation frequency of ∼2.2 kHz when the gate and drain of the load transistor are biased at 30 V; the maximum oscillation frequency observed is ∼9.5 kHz, with the gate and drain of the load transistor biased at ∼80 V.

[1]  Wolfgang Clemens,et al.  Fully printed integrated circuits from solution processable polymers , 2004 .

[2]  Randy Hoffman,et al.  High mobility transparent thin-film transistors with amorphous zinc tin oxide channel layer , 2005 .

[3]  Satoshi Masuda,et al.  Transparent thin film transistors using ZnO as an active channel layer and their electrical properties , 2003 .

[4]  Douglas A. Keszler,et al.  Spin-coated zinc oxide transparent transistors , 2003 .

[5]  Rahul Sarpeshkar,et al.  Organic complementary ring oscillators , 1999 .

[6]  R. Hoffman.  ZnO-channel thin-film transistors: Channel mobility , 2004 .

[7]  W. Fix,et al.  From polymer transistors toward printed electronics , 2004 .

[8]  Randy Hoffman,et al.  Transparent thin-film transistors with zinc indium oxide channel layer , 2005 .

[9]  Douglas A. Keszler,et al.  Tin oxide transparent thin-film transistors , 2004 .

[10]  Gerwin H. Gelinck,et al.  High-performance all-polymer integrated circuits , 2000 .

[11]  W. F. Peck,et al.  GaInO3: A new transparent conducting oxide , 1994 .

[12]  H. Ohta,et al.  Thin-Film Transistor Fabricated in Single-Crystalline Transparent Oxide Semiconductor , 2003, Science.

[13]  Masashi Kawasaki,et al.  High Mobility Thin Film Transistors with Transparent ZnO Channels , 2003 .

[14]  R. McLean,et al.  Transparent ZnO thin-film transistor fabricated by rf magnetron sputtering , 2003 .

[15]  Benjamin J. Norris,et al.  ZnO-based transparent thin-film transistors , 2003 .