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High Performance Temperature Sensors using SC-CVD Diamond Schottky Diodes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
School of Information and Communication Technology, KTH Royal Institute of Technology.
School of Information and Communication Technology, KTH Royal Institute of Technology.
School of Information and Communication Technology, KTH Royal Institute of Technology.
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2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118Article in journal, Letter (Refereed) Published
Abstract [en]

The synthesis of new materials for thermal IR detection has been an intensive research area during the recent years. Among the new materials, diamond has the ability to function under high temperature, high power, and high radiation conditions, which enables large performance enhancements to a wide variety of systems and applications, e.g. electric vehicles, space exploration and nuclear energy reactors. In this study, diamond Schottky diodes (with boron concentrations in the range 1×1015 - 3×1016 cm-3) are presented as candidates for IR sensors with an excellent temperature coefficient of resistance (-16 %/K) and noise levels around 1.8×10-14 (V2/Hz).

Place, publisher, year, edition, pages
2012.
Keyword [en]
CVD diamond, TCR, Schottky diodes, IR detector
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-173597OAI: oai:DiVA.org:uu-173597DiVA: diva2:524557
Available from: 2012-05-02 Created: 2012-05-01 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Experimental Studies of Charge Transport in Single Crystal Diamond Devices
Open this publication in new window or tab >>Experimental Studies of Charge Transport in Single Crystal Diamond Devices
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Diamond is a promising material for high-power, high-frequency and high- temperature electronics applications, where its outstanding physical properties can be fully exploited. It exhibits an extremely high bandgap, very high carrier mobilities, high breakdown field strength, and the highest thermal conductivity of any wide bandgap material. It is therefore an outstanding candidate for the fastest switching, the highest power density, and the most efficient electronic devices obtainable, with applications in the RF power, automotive and aerospace industries. Lightweight diamond devices, capable of high temperature operation in harsh environments, could also be used in radiation detectors and particle physics applications where no other semiconductor devices would survive.

The high defect and impurity concentration in natural diamond or high-pressure-high-temperature (HPHT) diamond substrates has made it difficult to obtain reliable results when studying the electronic properties of diamond. However, progress in the growth of high purity Single Crystal Chemical Vapor Deposited (SC-CVD) diamond has opened the perspective of applications under such extreme conditions based on this type of synthetic diamond.

Despite the improvements, there are still many open questions. This work will focus on the electrical characterization of SC-CVD diamond by different measurement techniques such as internal photo-emission, I-V, C-V, Hall measurements and in particular, Time-of-Flight (ToF) carrier drift velocity measurements. With these mentioned techniques, some important properties of diamond such as drift mobilities, lateral carrier transit velocities, compensation ratio and Schottky barrier heights have been investigated. Low compensation ratios (ND/NA) < 10-4 have been achieved in boron-doped diamond and a drift mobility of about 860 cm2/Vs for the hole transit near the surface in a lateral ToF configuration could be measured. The carrier drift velocity was studied for electrons and holes at the temperature interval of 80-460 K. The study is performed in the low-injection regime and includes low-field drift mobilities. The hole mobility was further investigated at low temperatures (10-80 K) and as expected a very high mobility was observed.

In the case of electrons, a negative differential mobility was seen in the temperature interval of 100-150K. An explanation for this phenomenon is given by the intervally scattering and the relation between hot and cold conduction band valleys. This was observed in direct bandgap semiconductors with non-equivalent valleys such as GaAs but has not been seen in diamond before.

Furthermore, first steps have been taken to utilize diamond for infrared (IR) radiation detection. To understand the fundamentals of the thermal response of diamond, Temperature Coefficient of Resistance (TCR) measurements were performed on diamond Schottky diodes which are a candidate for high temperature sensors. As a result, very high TCR values in combination with a low noise constant (K1/f) was observed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 67 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 944
Keyword
Single crystal diamond, carrier transport, CVD diamond, time-of-flight, mobility, IR detector, compensation, diamond diode, drift velocity, thermal detector
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-173599 (URN)978-91-554-8391-3 (ISBN)
Public defence
2012-06-05, Häggsalen, Lägerhyddsvägen 1, Ångströmlaboratoriet, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2012-05-15 Created: 2012-05-01 Last updated: 2013-01-07Bibliographically approved

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Majdi, SamanKovi, Kiran KumarIsberg, Jan

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