Pt/GaN Schottky diodes for hydrogen gas sensors

Ali, Muhammad Asım; Cimalla, V.; Lebedev, V.; Romanus, H.; Tilak, V.; Merfeld, D. W.; Sandvik, Peter; Ambacher, O.

doi:10.1016/j.snb.2005.03.019

Cited by 76 publications

(47 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be observed that the voltage decreases for increasing temperature in theses diodes. This may be due to a reduction in the Pt work function [5], but may also have a contribution from temperature-dependent-tunneling through the barrier as discussed for similar diodes by Hashizume et al [6].…”

Section: Testing In Oilmentioning

confidence: 94%

“…Other device sizes of 0.5 by 0.5 mm and 0.25 by 0.25 mm were also fabricated, in order to study the size dependence on sensitivity. This study, along with an initial investigation of their response to hydrogen in air will be reported elsewhere [5]. Here, the focus regards the testing of these devices while submerged in transformer oil.…”

Section: Device Fabricationmentioning

confidence: 99%

“…Current-voltage (I-V) measurements of an average diode showed a typical leakage current of 10 µA/mm 2 at -10 V bias. Calculations of the barrier height yielded a value of 0.91 eV at room temperature [5]. To ensure the diodes were operated in the high injection region of the I-V relationship, a value of 5 mA was used as a constant bias while the voltage was allowed to vary unless noted otherwise.…”

Section: Testing In Oilmentioning

confidence: 99%

See 2 more Smart Citations

GaN‐based Schottky diodes for hydrogen sensing in transformer oil

Sandvik¹,

Babes-Dornea

Trudel

et al. 2006

Phys. Status Solidi (c)

View full text Add to dashboard Cite

We report the demonstration of robust, GaN-based hydrogen sensors for use directly in transformer oil. These 1 mm 2 Schottky diodes were immersed in a closed loop with Voltesso insulating oil for 21 months of continuous testing. They showed good reproducibility in response to hydrogen gases, while exposed to varying temperatures. We will briefly discuss the transformer monitoring application, the device design and fabrication process, and the sensor performance from 21-months of testing. Transfer functions from oil temperature and dissolved gas concentration have been quantified, and those will be briefly discussed. These new sensors offer a novel alternative to electrochemical cell-based sensors for various applications.

show abstract

Section: Testing In Oilmentioning

confidence: 94%

Section: Device Fabricationmentioning

confidence: 99%

Section: Testing In Oilmentioning

confidence: 99%

See 1 more Smart Citation

GaN‐based Schottky diodes for hydrogen sensing in transformer oil

Sandvik¹,

Babes-Dornea

Trudel

et al. 2006

Phys. Status Solidi (c)

View full text Add to dashboard Cite

show abstract

“…The passivated interface thus causes an improvement in the barrier height. Due to this lowering of barrier height, the current through the junction further increases in presence of the gas [5,18,44,45], thereby yielding a high response.…”

Section: Methane Sensing Mechanismmentioning

confidence: 99%

Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals

Basu

2009

Journal of Sensors

130

View full text Add to dashboard Cite

Methane is an important gas for domestic and industrial applications and its source is mainly coalmines. Since methane is extremely inflammable in the coalmine atmosphere, it is essential to develop a reliable and relatively inexpensive chemical gas sensor to detect this inflammable gas below its explosion amount in air. The metal oxides have been proved to be potential materials for the development of commercial gas sensors. The functional properties of the metal oxide-based gas sensors can be improved not only by tailoring the crystal size of metal oxides but also by incorporating the noble metal catalyst on nanocrystalline metal oxide matrix. It was observed that the surface modification of nanocrystalline metal oxide thin films by noble metal sensitizers and the use of a noble metal catalytic contact as electrode reduce the operating temperatures appreciably and improve the sensing properties. This review article concentrates on the nanocrystalline metal oxide methane sensors and the role of noble metals on the sensing properties.

show abstract

“…Тонкие поликристаллические пленки Pt применяются в качестве тыльного электрода в приборах с перовски-топодобными сегнетоэлектриками [1][2][3], в качестве ката-лизатора в сенсорах различных газов [4,5], как покрытия с низкой поглощательной способностью в ИК диапа-зоне [6], а также в качестве резистивных нагревателей и сенсоров температуры в МЭМС [7]. Во всех этих случаях микроструктура Pt оказывает влияние на харак-теристики приборов и покрытий.…”

Section: Introductionunclassified

Влияние толщины пленки Pt на процессы роста зерен при ее отжиге

Селюков¹,

Наумов²,

Васильев³

2018

Журнал Технической Физики

View full text Add to dashboard Cite

Пленки Pt с толщиной h = 20−100 nm, нанесенные на окисленную пластину c-Si (100), подвергались отжигу в вакууме в режиме 500• C/1 h, в результате которого произошли рекристаллизация и рост зерен. Одновременно с нормальным наблюдался и аномальный рост, что привело к разделению зерен на фракции, соответственно, обычных и вторичных зерен. Для h = 20−40 nm вторичные зерна становятся заметно крупнее обычных, поэтому распределение латеральных размеров зерен становится бимодальным. Найдено, что скорость аномального роста латеральных размеров зерен увеличивается с уменьшением h, тогда как скорость нормального роста не зависит от h. С помощью анализа профилей рентгенодифракционных максимумов Pt(111) и Pt(222) найдено, что в результате отжига средний размер областей когерентного рассеяния D увеличивается. Для пленок, подвергнутых отжигу, D сублинейно увеличивается с ростом h, тогда как для исходных пленок наблюдается линейный рост D.

show abstract

Pt/GaN Schottky diodes for hydrogen gas sensors

Cited by 76 publications

References 14 publications

GaN‐based Schottky diodes for hydrogen sensing in transformer oil

GaN‐based Schottky diodes for hydrogen sensing in transformer oil

Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals

Влияние толщины пленки Pt на процессы роста зерен при ее отжиге

Contact Info

Product

Resources

About