Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer

• DOI: 10.1002/adma.201703543
• Publication Date: 2017-10-25T07:12:44Z
• Authors: Sirui Zhang; Yinlian Zhu; Yunlong Tang; Ying Liu; Shuang Li; Mengjiao Han; Jinyuan Ma; Bo Wu; Zuhuang Chen; Sahar Saremi; Xiuliang Ma
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy; 12. Responsible consumption

Ferroelectricity is generally deteriorated or even vanishes when the ferroelectric films are downsized to unit cell scale. To maintain and enhance polarization in nanoscale ferroelectrics of scientific technological importance. Here, giant sustainability reported a series ultrathin PbTiO3 scaled down three cells grown on NdGaO3 (110) substrates with La0.7 Sr0.3 MnO3 as bottom electrodes. Atomic mappings via aberration-corrected scanning transmission electron microscopy demonstrate robust ferroelectricity for sub-10 nm thick film. For 1.2 film, reaches ≈50 µC cm-2 . The 2 film possesses high bulk value. ranging from 10 35 display elongation out-of-plane lattice parameter, which corresponds 100 , 20% larger than that enhancement present proposed result charge transfer at /PbTiO3 interface, supported by anomalous decrease Mn valence measured X-ray photoelectron spectroscopy. These results reveal significant role interfaces improving large polarizations meaningful development future electronic devices.