MoO3, PZ29 and TiO2 based ultra-low fabrication temperature glass-ceramics for future microelectronic devices

Thesis event information

Date and time of the thesis defence

Place of the thesis defence

Lecture Hall IT116

Topic of the dissertation

MoO3, PZ29 and TiO2 based ultra-low fabrication temperature glass-ceramics for future microelectronic devices

Doctoral candidate

Doctor of Philosophy (Technology) Jobin Varghese

Faculty and unit

University of Oulu Graduate School, Faculty of Information Technology and Electrical Engineering, Microelectronics Research Unit

Subject of study

Electronics Materials and Components


Professor Matjaž Spreitzer, University of Ljubljana


Professor Heli jantunen, University of Oulu

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New environmentally friendly ceramic materials for telecommunications components and electronics packaging technology

The doctoral thesis has shown that the new ultra-low temperature co-fired ceramics (ULTCCs) can be used to manufacture components for telecommunications technology and electronics applications in an environmentally friendly and cost-effective manner. New ceramic materials, which require manufacturing process temperatures of up to 200 - 550 degrees lower than those currently used in industry, played a key role in the study. These also allow for lower investment costs of production.

Three new types of materials were developed, based on ceramics and glasses with a very low manufacturing process. By combining these separately and in different ways, low-loss materials could be produced which, according to their measured properties, can be used for high-frequency applications in telecommunications technology. The materials were also feasible for multi-layer components including the required conductor patterns fired in the same process step. Materials for ultra-low temperature co-fired technology were also found to be promising in electronics packaging technology. In addition, the first step in the preparation of the functional ULTCC components was taken by demonstrating a piezoelectric composition that can be used, for example, in sensors.

Doctoral research contributes to the demands of increased environmental awareness of consumers and industry by presenting environmentally friendly and energy- and cost-effective solutions for both bulk and multilayer ceramics.
Last updated: 1.3.2023