Huajing Fang - Novel Devices Based on Relaxor Ferroelectric PMN-PT Single Crystals

Aims and Scope

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As an important ferroelectric material, Pb(Mg1/3Nb2/3)O3-xPbTiO3(PMN-PT) solid solutions combined the advantages of relaxor ferroelectric PMN and ferroelectric PT predictably. With the modified Bridgman technique, large-size and high-quality PMN-PT single crystals have been successfully grown. The single crystals with the composition near the morphotropic phase boundary (MPB) exhibit ultra high piezoelectric constant of ~2500 pC/N and large electromechanical coupling coefficient up to 0.9. In recent years, piezoelectric devices based on the PMN-PT single crystals have received much attention and made a revolution in the electromechanical transduction area. In contrast, the applications related to their excellent ferroelectric and pyroelectric properties of this multifunctional materials are still not mature enough. Therefore, further investigation on extending their ferroelectric and pyroelectric applications is highly desirable.

The main aim of this doctoral thesis is to explore the applications of ferroelectric materials such as PMN-PT single crystals in information technology. Several prototype devices have been designed and fabricated which are responsible for the collection, processing and storage of the information data. For example, an optothermal field effect transistor (FET) based on the pyroelectric PMN-PT single crystal and MoS2single-layer film is introduced in Chap.. The data can be written in the PMN-PT-based FET by tapping a triboelectric nanogenerator.

The research was carried out at Department of Chemistry in Tsinghua University with the cooperation from Department of Applied Physics in The Hong Kong Polytechnic University, Department of Physics in Tsinghua University and Institute of Microelectronics in Tsinghua University. The research contents in this thesis are not only in the frontiers of ferroelectric materials, but also at the multidisciplinary highly cross-cutting edge. Some excited results and design ideas are expected to drive ferroelectric materials to play an important role in a wide range of applications.