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Interface-engineered electron and hole tunneling.

Rui GuoLingling TaoMing LiZhongran LiuWeinan LinGuowei ZhouXiaoxin ChenLiang LiuXiaobing YanHe TianEvgeny Y TsymbalJingsheng Chen
Published in: Science advances (2021)
Although the phenomenon of tunneling has been known since the advent of quantum mechanics, it continues to enrich our understanding of many fields of science. Commonly, this effect is described in terms of electrons traversing the potential barrier that exceeds their kinetic energy due to the wave nature of electrons. This picture of electron tunneling fails, however, for tunnel junctions, where the Fermi energy lies sufficiently close to the insulator valence band, in which case, hole tunneling dominates. We demonstrate the deterministic control of electron and hole tunneling in interface-engineered Pt/BaTiO3/La0.7Sr0.3MnO3 ferroelectric tunnel junctions by reversal of tunneling electroresistance. Our electrical measurements, electron microscopy and spectroscopy characterization, and theoretical modeling unambiguously point out to electron or hole tunneling regimes depending on interface termination. The interface control of the tunneling regime offers designed functionalities of electronic devices.
Keyphrases
  • solar cells
  • electron microscopy
  • single molecule
  • perovskite solar cells
  • high resolution
  • mass spectrometry
  • electron transfer
  • monte carlo