Date of Graduation

8-2024

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Engineering (PhD)

Degree Level

Graduate

Department

Electrical Engineering

Advisor/Mentor

Chen, Zhong

Committee Member

Tian, Z. Ryan

Second Committee Member

McCann, Roy A.

Third Committee Member

Ware, Morgan E.

Keywords

Expaned graphite; Organic electronics; PEDOT:PSS conductive Film; Power module packaging; Silver nanoparticles; Silver paste

Abstract

Nanoparticles can greatly change the properties of regular materials due to their special structures. In this research nanoparticles, such as silver nanowires, silver nanospheres and expanded graphite, are used in interconnection materials for power module packaging, and in conductive films for organic electronics. Silver nanowires synthesized by polyol synthesis, are used as fillers in micron silver paste. The electrical and mechanical properties of the sintered hybrid silver paste are investigated and compared with those of micron silver paste. The composites of silver nanospheres and expanded graphite are mixed with PEDOT:PSS solutions in 5 different weight ratio. The electrical and optical parameters of the mixtures are measured individually, and compared with those of pure PEDOT:PSS. With the existence of nanoparticles, the performances of silver paste and organic film are both improved. This dissertation contains my research in nanoparticle synthesis and applications. It covers the objectives of this research, the basic concepts and knowledge of wide bandgap (WBG) devices circuit package and organic electronic devices, the principle and processes of nanomaterial (silver nanowires, silver nanospheres and expanded graphite) synthesis, detailed experimental procedures, data measurements, results analysis and final comprehensive conclusions.

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