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Electrical characterization and morphological properties of AlN films prepared by dc reactive magnetron sputtering
2011 (Engelska)Ingår i: Microelectronic Engineering, ISSN 0167-9317, E-ISSN 1873-5568, Vol. 88, nr 5, s. 802-806Artikel i tidskrift, Meeting abstract (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2011. Vol. 88, nr 5, s. 802-806
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
URN: urn:nbn:se:uu:diva-222603DOI: 10.1016/j.mee.2010.06.045OAI: oai:DiVA.org:uu-222603DiVA, id: diva2:711923
Konferens
The 2010 International workshop on “Materials for Advanced Metallization” - MAM 2010
Tillgänglig från: 2014-04-11 Skapad: 2014-04-11 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Synthesis of Thin Piezoelectric AlN Films in View of Sensors and Telecom Applications
Öppna denna publikation i ny flik eller fönster >>Synthesis of Thin Piezoelectric AlN Films in View of Sensors and Telecom Applications
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The requirements of the consumer market on high frequency devices have been more and more demanding over the last decades. Thus, a continuing enhancement of the devices’ performance is required in order to meet these demands. In a macro view, changing the design of the device can result in an improvement of its performance. In a micro view, the physical properties of the device materials have a strong influence on its final performance. In the case of high frequency devices based on piezoelectric materials, a natural way to improve their performance is through the improvement of the properties of the piezoelectric layer. The piezoelectric material studied in this work is AlN, which is an outstanding material among other piezoelectric materials due to its unique combination of material properties.

This thesis presents results from experimental studies on the synthesis of AlN thin films in view of telecom, microelectronic and sensor applications. The main objective of the thesis is to custom design the functional properties of AlN to best suit these for the specific application in mind. This is achieved through careful control of the crystallographic structure and texture as well as film composition.

The piezoelectric properties of AlN films were enhanced by doping with Sc. Films with different Sc concentrations were fabricated and analyzed, and the coupling coefficient (kt2) was enhanced a factor of two by adding 15% of Sc to the AlN films. The enhancement of kt2 is of interest since it can contribute to a more relaxed design of high frequency devices. Further, in order to obtain better deposition control of c-axis tilted AlN films, a new experimental setup were proposed. When this novel setup was used, films with well-defined thicknesses and tilt uniformity were achieved. Films with such characteristics are very favorable to use in sensors based on electroacoustic devices operating in viscous media. Studies were also performed in order to obtain c-axis oriented AlN films deposited directly on Si substrates at reduced temperatures. The deposition technique used was HiPIMS, and the results indicated significant improvements in the film texture when comparing to the conventional Pulsed DC deposition process.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2014. s. 83
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1160
Nyckelord
Aluminum nitride, reactive sputtering, c-axis oriented films, tilted films, electroacoustic devices, piezoelectric materials, Aluminum Scandium Nitride, HiPIMS, high-k dielectric
Nationell ämneskategori
Annan materialteknik
Forskningsämne
Teknisk fysik med inriktning mot elektronik
Identifikatorer
urn:nbn:se:uu:diva-229588 (URN)978-91-554-8995-3 (ISBN)
Disputation
2014-09-24, Conference Room, FEEC, UNICAMP, Av. Albert Einstein, 400 / Cidade Universitária Zeferino Vaz / Distrito Barão Geraldo, Campinas, Brazil, 14:30 (Engelska)
Opponent
Handledare
Tillgänglig från: 2014-09-01 Skapad: 2014-08-11 Senast uppdaterad: 2014-09-08

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