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Effects of Mg Suppressor Layer on the InZnSnO Thin-Film Transistors
Song, Chang-Woo,Kim, Kyung-Hyun,Yang, Ji-Woong,Kim, Dae-Hwan,Choi, Yong-Jin,Hong, Chan-Hwa,Shin, Jae-Heon,Kwon, Hyuck-In,Song, Sang-Hun,Cheong, Woo-Seok The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.2
We investigate the effects of magnesium (Mg) suppressor layer on the electrical performances and stabilities of amorphous indium-zinc-tin-oxide (a-ITZO) thin-film transistors (TFTs). Compared to the ITZO TFT without a Mg suppressor layer, the ITZO:Mg TFT exhibits slightly smaller field-effect mobility and much reduced subthreshold slope. The ITZO:Mg TFT shows improved electrical stabilities compared to the ITZO TFT under both positive-bias and negative-bias-illumination stresses. From the X-ray photoelectron spectroscopy O1s spectra with fitted curves for ITZO and ITZO:Mg films, we observe that Mg doping contributes to an enhancement of the oxygen bond without oxygen vacancy and a reduction of the oxygen bonds with oxygen vacancies. This result shows that the Mg can be an effective suppressor in a-ITZO TFTs.
Clinical Usefulness of pH Papers in the Measurement of Salivary pH
Song, Chan-Woo,Kim, Hye-Kyoung,Kim, Mee-Eun Korean Academy of Orofacial Pain and Oral Medicine 2015 Journal of Oral Medicine and Pain Vol.40 No.3
Purpose: Salivary pH is an easily measurable biochemical marker and related to various intraoral and systemic conditions. The aim of this study was to evaluate the reliability of the salivary pH measurement using pH paper. In addition, the normal values of salivary pH using pH paper were compared to those of pH meter to investigate the validity. Methods: Twenty healthy male participants attended this study (mean age, $24.5{\pm}1.47$ years). Unstimulated saliva and stimulated saliva were collected from each subject two times with the interval of a day and salivary pH was immediately measured by the two experienced examiners using pH paper and pH meter. The salivary pH was compared between the groups and inter- and intra-examiner reliability of pH paper was investigated. The intraclass correlation coefficient (ICC) was used to calculate variations. Results: All measurements had good to excellent inter-examiner (ICC 0.755 for unstimulated; 0.760 for stimulated saliva), intra-examiner (ICC 0.635 for unstimulated; 0.592 for stimulated saliva) reliability and two measurement methods using pH paper and pH paper also showed high reliability (ICC 0.852 for unstimulated; 0.640 for stimulated saliva). The values measured by pH paper were significantly lower than those measured by pH meter. Conclusions: pH paper showed adequate inter- and intra-examiner reliability and it presented the validity in terms of comparison with the pH meter as a standard in the salivary pH measurement.