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IEICE TRANSACTIONS on Electronics

Characteristics of a-Si Thin-Film Transistors with an Inorganic Black Matrix on the Top

Yoshimine KATO, Yuki MIYOSHI, Masakazu ATSUMI, Yoshimasa KAIDA, Steven L. WRIGHT, Lauren F. PALMATEER

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Summary :

The characteristics of a-Si bottom-gate TFT test devices with several kinds of inorganic "quasi-black matrix," such as metal, semiconductor, and insulator, on the top were investigated for various black matrix(BM) resistivities. In the Ia-Vg characteristics, for a BM sheet resistance of about1 1012 Ω/, a high off current and large Vth shift were observed due to the back-gating effects when the BM is charged up. Accrding to the ac dynamic characteristics, there was almost no leakage due to the capacitive coupling between source and drain after 16.6 msec(one frame) when the BM sheet resistance was above 7 1013 Ω/ . It was found that hydrogenated amorphous silicon germanium(a-SiGe:H) film, which has enough optical density, with the sheet resistance above the order of 1014 Ω/ is a promising candidate for an inorganic BM on TFT array.

Publication
IEICE TRANSACTIONS on Electronics Vol.E79-C No.8 pp.1091-1096
Publication Date
1996/08/25
Publicized
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DOI
Type of Manuscript
Special Section PAPER (Special Issue on Liquid-Crystal Displays)
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