Hc. Cheng et al., THE INSTABILITY CHARACTERISTICS OF AMORPHOUS-SILICON THIN-FILM TRANSISTORS WITH VARIOUS INTERFACIAL AND BULK DEFECT STATES, JPN J A P 1, 36(10), 1997, pp. 6226-6229
The instability characteristics of hydrogenated amorphous silicon (a-S
i:H) thin film transistors (TFTs) with various interfacial and bulk de
fect states were systematically investigated. It was found that, under
positive bias stresses; the threshold voltage shifts of a-Si:H TFT's
with the same interfacial defect states but with different bulk defect
states exhibited similar threshold voltage shift characteristics. In
contrast, a-Si:H TFTs with different interfacial defect states but the
same bulk defect states showed threshold voltage shifts proportional
to the interfacial defect states under positive bias stresses. Further
more, both the above kinds of a-Si:H TFT under positive bias stresses
exhibited that the subthreshold swing shift characteristics closely re
lated to both the interfacial and bulk defect states.