Development of thin film getters suitable for field-emission display in high vacuum systems

Kim, Kyung Chan; Ahn, Hyung Jin; Yoon, Young Joon; Baik, Hong Koo; Lee, Sung Man; Lee, Se Jong

doi:10.1116/1.1800291

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…After installation, a getter has to be thermally activated to get rid of the protection layer that comes from oxidation. For example, in an experiment by Kim et al (2004), zirconium alloy was used as the getter material while platinum and nickel were stacked on top of Zr as catalysts and protection from oxidation. Zr film getters with Pt and Ni layers displayed to have effective absorption characteristics.…”

Section: Vacuum Getters and Activationmentioning

confidence: 99%

Honeycomb Betavoltaic Battery for Space Applications

Lee¹,

Ulmen²,

Miley³

2008

AIP Conference Proceedings

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Radioisotopic batteries offer advantages relative to conventional chemical batteries for applications requiring a long lifetime with minimum maintenance. Thus, thermoelectric type cells fueled with Pu have been used extensively on NASA space missions. The design for a small beta battery using nickel-63 (Ni-63) and a vacuum direct collection method is described here. A honeycomb nickel wire structure is employed to achieve bi-directional direct collection by seeding Ni-63 onto honeycomb shaped wires that will provide structural support as well. The battery design is intended to power low power electronics and distribute power needs in space probes as well as space colonies. Ni-63 is chosen as the source emitter because it has a long half-life and ease of manufacturing. The use of vacuum is especially well mated to space use; hence, vacuum insulation is employed to gain a higher efficiency than prior beta batteries with a dielectric insulator. A unique voltage down-converter is incorporated to efficiently reduce the inherent output voltage from 17.4 kV to ~ 17.4 V. This converter operates like a "reverse" Marx circuit where capacitor charging occurs in series but the discharge is in parallel. The reference battery module described here is about 100 cm x 100 cm x 218 cm and has a power of ~10 W with a conversion efficiency of-15.8 %. These modules can be stacked for higher powers and are very attractive for various applications in space colonization due to their long life (half-life for Ni-63 -100 yrs) and low maintenance.

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Section: Vacuum Getters and Activationmentioning

confidence: 99%

Honeycomb Betavoltaic Battery for Space Applications

Lee¹,

Ulmen²,

Miley³

2008

AIP Conference Proceedings

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Characterization and Evaluation of Ti-Zr-V Non-evaporable Getter Films Used in Vacuum Systems

et al. 2012

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Degradation of GaN field emitter arrays induced by O2 exposure

Farsad Asadi,

Zheng,

Shih

et al. 2024

Journal of Vacuum Science &Amp; Technology B

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Field emitter arrays (FEAs) have the potential to operate at high frequencies and in harsh environments. However, they have been shown to degrade under oxidizing environments. Studying the effect of O2 on FEAs can help to understand the degradation mechanisms, identify the requirements for vacuum packaging, and estimate the lifetime of the device. In this work, the effect of O2 exposure on 100 × 100 gallium-nitride-field emitter arrays (GaN-FEAs) was studied. The GaN-FEAs were operated at 6 × 10−10 Torr with a 1000 V DC anode voltage and a 50 V DC gate voltage, where the anode current was 1 μA and the gate current was ≤4 nA. The devices were exposed to 10−7, 10−6, and 10−5 Torr of O2 for 100 000 L. The anode current dropped by 50% after 300 L and 98% after 100 000 L. It was observed that the degradation depends on the exposure dose, rather than pressure. The devices mostly degrade when they are ON, confirmed by exposing the device to O2 when the gate voltage was off, and also by the relation between the degradation and duty cycle when pulsing the gate. The results of O2 exposure were compared to Ar exposure to determine whether sputtering and changes in the surface geometry were the primary cause of degradation. The results suggest that changes in the work function and surface chemistry are the cause of emission degradation of GaN-FEA induced by O2.

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Development of thin film getters suitable for field-emission display in high vacuum systems

Abstract: High-voltage triode flat-panel display using field-emission nanotube-based thin films Influence of getter activation and aging in a frit-sealed field emission display panel

Cited by 5 publications

References 16 publications

Honeycomb Betavoltaic Battery for Space Applications

Honeycomb Betavoltaic Battery for Space Applications

Characterization and Evaluation of Ti-Zr-V Non-evaporable Getter Films Used in Vacuum Systems

Degradation of GaN field emitter arrays induced by O2 exposure

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