Low voltage electron emission from ferroelectric materials [Elektronische Ressource] / vorgelegt von Oliver Mieth

Institut fur Angewandte PhysikFachrichtung PhysikFakultat Mathematik und NaturwissenschaftenTechnische Universitat DresdenLow Voltage Electron Emissionfrom Ferroelectric MaterialsDissertationzur Erlangung des akademischen GradesDoctor rerum naturalium(Dr. rer. nat.)vorgelegt vonOliver Miethgeboren am 17. Februar 1981 in Mei enDresden 2010Eingereicht am 11.03.20101. Gutachter: Prof. Dr. Lukas M. Eng2. Gutachter: Prof. Dr. Ramamoorthy RameshVerteidigt am 26.10.2010AbstractElectron emission from ferroelectric materials is initiated by a variation of thespontaneous polarization. It is the main focus of this work to develop ferroelec-tric cathodes, which are characterized by a signicantly decreased excitationvoltage required to initiate the electron emission process. Particular attentionis paid to the impact of the polarization on the emission process. Two materialsare investigated. Firstly, relaxor ferroelectric lead magnesium niobate - leadtitanate (PMN-PT) single crystals are chosen because of their low intrinsic5 2coercive eld. Electron emission current densities up to 5 10 A=cm areachieved for excitation voltages of 160 V. A strong enhancement of the emis-sion current is revealed for the onset of a complete polarization reversal. Sec-ondly, lead zirconate titanate (PZT) thin lms are investigated.