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Studies on temperature coefficient of resistance TCR of polymer thick film resistors

Studies on temperature coefficient of resistance TCR of polymer thick film resistors Purpose The purpose of this paper is to study the variation of the temperature coefficient of resistance TCR of polymer thick film resistors, namely, PVCgraphite thick film resistors, with parameters such as volume fraction, grain size, and high voltage.Designmethodologyapproach A model is proposed to explain the observed variations, which assumes that the texture of the thick film resistors consists of insulator granules coated with conducting particles.Findings The paper finds that the TCR of these materials is controlled mainly by the contact resistance fluctuations between the conducting particles and the number of contacts each particle has with it neighbours. The variation of TCR with high voltage has also been explained with the help of this model and it is attributed to the changes in contact area and the number of contacts.Originalityvalue The value of the paper is in showing that apparently the TCR of polymer thick film resistors can be controlled by the expansion properties of the insulating medium. The variation of TCR with high voltage is also due to change in number of contacts between the conducting particles. These types of material may find applications in thermal sensors or as temperature control elements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Microelectronics International Emerald Publishing

Studies on temperature coefficient of resistance TCR of polymer thick film resistors

Microelectronics International , Volume 25 (3): 4 – Jul 25, 2008

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
1356-5362
DOI
10.1108/13565360810889601
Publisher site
See Article on Publisher Site

Abstract

Purpose The purpose of this paper is to study the variation of the temperature coefficient of resistance TCR of polymer thick film resistors, namely, PVCgraphite thick film resistors, with parameters such as volume fraction, grain size, and high voltage.Designmethodologyapproach A model is proposed to explain the observed variations, which assumes that the texture of the thick film resistors consists of insulator granules coated with conducting particles.Findings The paper finds that the TCR of these materials is controlled mainly by the contact resistance fluctuations between the conducting particles and the number of contacts each particle has with it neighbours. The variation of TCR with high voltage has also been explained with the help of this model and it is attributed to the changes in contact area and the number of contacts.Originalityvalue The value of the paper is in showing that apparently the TCR of polymer thick film resistors can be controlled by the expansion properties of the insulating medium. The variation of TCR with high voltage is also due to change in number of contacts between the conducting particles. These types of material may find applications in thermal sensors or as temperature control elements.

Journal

Microelectronics InternationalEmerald Publishing

Published: Jul 25, 2008

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