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Advantage of La2O3 over HfO2 MOSFET has been experimentally examined. Silicate reaction especially observed at La2O3/Si interface has been found to suppress the formation of SiO2 layer to realize direct contact, which is useful for further scaling in equivalent oxide thickness (EOT). Due to the lack of interfacial layer, La2O3 has showed relatively high interfacial state density, however, the effective...
The origin of negative flat-band shift using La2O3 incorporation in HfO2 dielectrics has been extensively examined. From careful extraction of effective work function of gate electrode and fixed charges at each interface, it has been revealed that La2O3 at high-k/Si substrate or high-k/SiO2 interface has either large amount of positive fixed charges or an additional dipole of 0.36 V compared to that...
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