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Title: Controlling band alignments by artificial interface dipoles at perovskite heterointerfaces

The concept ‘the interface is the device' is embodied in a wide variety of interfacial electronic phenomena and associated applications in oxide materials, ranging from catalysts and clean energy systems to emerging multifunctional devices. Many device properties are defined by the band alignment, which is often influenced by interface dipoles. On the other hand, the ability to purposefully create and control interface dipoles is a relatively unexplored degree of freedom for perovskite oxides, which should be particularly effective for such ionic materials. Here we demonstrate tuning the band alignment in perovskite metal-semiconductor heterojunctions over a broad range of 1.7 eV. This is achieved by the insertion of positive or negative charges at the interface, and the resultant dipole formed by the induced screening charge. This approach can be broadly used in applications where decoupling the band alignment from the constituent work functions and electron affinities can enhance device functionality.
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6] ;  [3]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Tokyo (Japan)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  4. Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
  5. High Energy Accelerator Research Organization (Japan)
  6. Univ. of Tokyo (Japan)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2041-1723; ncomms7759
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States