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Pseudo-CMOS: A Design Style for Low-Cost and Robust Flexible Electronics

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7 Author(s)
Tsung-Ching Huang ; Institute of Industrial Science, University of Tokyo, Tokyo, Japan ; Kenjiro Fukuda ; Chun-Ming Lo ; Yung-Hui Yeh
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Thin-film transistors (TFTs) are a key element of flexible electronics implemented on low-cost substrates. Most TFT technologies, however, have only monotype-either n- or p-type-devices. In this paper, we propose a novel design style Pseudo-CMOS for flexible electronics that uses only monotype single-VT TFTs but has comparable performance with the complementary-type or dual-VT designs. The manufacturing cost and complexity can therefore be significantly reduced, whereas the circuit yield and reliability are enhanced with built-in postfabrication tunability. Digital cells are fabricated in two different TFT technologies, i.e., p-type self-assembled-monolayer-organic TFTs and n-type metal-oxide InGaZnO TFTs, to validate the proposed Pseudo-CMOS design style. To the best of our knowledge, this is the first design solution that has been experimentally proven to achieve superior performance for both types of TFT technologies.

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IEEE Transactions on Electron Devices  (Volume:58 ,  Issue: 1 )