Thickness limit of ferroelectricity in non-strained SrTiO3 Thin Films

  • 黃 浩翔

Student thesis: Doctoral Thesis

Abstract

As the mature technology the thickness of single crystal thin films in three-dimensional system can be reduced to become ultrathin films while remained the intriguing functionalities These ultrathin material structures were called quasi-two-dimensional system It is an excellent technique in terms of thickness control and growth of single crystal structure Strontium titanate (SrTiO3 STO) is a paraelectric materials in perovskite structure Although it is affected by quantum fluctuations at low temperatures to suppress ferroelectricity it exhibits the quantum paraelectricity at ambient temperature Many researchers have tried to perform chemical composition mechanical and optical adjustments to strontium titanate so that the low-temperature limited ferroelectric properties can be displayed at room temperature In this study we use pulsed laser deposition technique to grow thin films and also use wet etching separation technique (also called freestanding) to transfer the thin films to other substrates and to integrate heterogeneous structures We use both the scanning probe microscope and X-ray analysis to carry out the ferroelectricity characterization in strontium titanate thin films at room temperature before and after freestanding and also verify the previous research and breakthroughs on this basis
Date of Award2020
Original languageEnglish
SupervisorJan-Chi Yang (Supervisor)

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