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147 results on '"Park, Bang Ju"'

24. Achieving High Field-Effect Mobility Exceeding 90 cm2/Vs in a-IGZTO Transistors With Excellent Reliability

Author

Park, Bang Ju, Chung, Sang Won, Kim, Min Jae, Lee, Heung Jo, Bae, Jae Hoon, Kang, Sung Chun, and Jeong, Jae Kyeong

Abstract

In this letter, amorphous indium-gallium-zinc-tin oxide ( ${a}$ -IGZTO) thin-film transistors (TFTs) were characterized with a bottom gate structure, where a single target with three cation composition ratios were used to deposit the a-IGZTO channel layer. Remarkably, ${a}$ -In $_{{0.60}}$ Ga $_{{0.14}}$ Zn $_{{0.20}}$ Sn $_{{0.06}}\text{O}$ TFTs exhibited exceptional performance, featuring a significantly high field-effect mobility of 90.2 cm2/Vs, a low subthreshold swing of 0.10 V/decade, a threshold voltage ( ${V} _{\text {TH}}$ ) of −0.40 V, and an ${I} _{\text {ON/OFF}}$ ratio of $3\times 10^{{8}}$ . Furthermore, the TFTs demonstrated excellent bias temperature stress (BTS) reliability, with minimal variations in ${V} _{\text {TH}}$ ( $\Delta {V}_{\text {TH}}$ ) less than ±0.08 V under negative and positive bias temperature stress at 60 °C for 1 hour. The impressive performance and reliability observed in these TFTs can be attributed to the synergistic percolation of In $^{\text {3+}}$ and Sn $^{\text {4+}}$ and the beneficial hydrogen-doping effect near Sn cations.

Published
2023
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42. Synthesis and Evaluation of Graphene Aerogel‐Supported MnxFe3−xO4 for Oxygen Reduction in Urea/O2 Fuel Cells.

Author

Bejigo, Keyru Serbara, Park, Bang Ju, Kim, Ji Hyeon, and Yoon, Hyon Hee

Subjects
*FUEL cells, *OXYGEN reduction, *MICROBIAL fuel cells, *GRAPHENE synthesis, *ALKALINE fuel cells, *POWER density
Abstract

Graphene aerogel‐supported manganese ferrite (MnxFe3−xO4/GAs) and reduced‐graphene oxide/manganese ferrite composite (MnFe2O4/rGO) were synthesized and studied as cathode catalysts for oxygen reduction reactions in urea/O2 fuel cells. MnFe2O4/GAs exhibited a 3D framework with a continuous macroporous structure. Among the investigated Fe/Mn ratios, the more positive oxygen reduction onset potential was observed with Fe/Mn=2/1. The half‐wave potential of MnFe2O4/GAs was considerably more positive than that of MnFe2O4/rGO and comparable with that of Pt/C, while the stability of MnFe2O4/GAs significantly higher than that of Pt/C. The best urea/O2 fuel cell performance was also observed with the MnFe2O4/GAs. The MnFe2O4/GAs exhibited an OCV of 0.713 V and a maximum power density of 1.7 mW cm−2 at 60 °C. Thus, this work shows that 3D structured graphene aerogel‐supported MnFe2O4 catalysts can be used as an efficient cathode material for alkaline fuel cells. [ABSTRACT FROM AUTHOR]

Published
2019
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