Concept of Lattice Mismatch and Emergence of Surface States in Two-dimensional Hybrid Perovskite Quantum Wells

Mikaël Kepenekian, Boubacar Traore, Jean Christophe Blancon, Laurent Pedesseau, Hsinhan Tsai, Wanyi Nie, Constantinos C. Stoumpos, Mercouri G. Kanatzidis, Jacky Even, Aditya D. Mohite, Sergei Tretiak, Claudine Katan

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


Surface states are ubiquitous to semiconductors and significantly impact the physical properties and, consequently, the performance of optoelectronic devices. Moreover, surface effects are strongly amplified in lower dimensional systems such as quantum wells and nanostructures. Layered halide perovskites (LHPs) are two-dimensional solution-processed natural quantum wells where optoelectronic properties can be tuned by varying the perovskite layer thickness n, i.e., the number of octahedra spanning the layer. They are efficient semiconductors with technologically relevant stability. Here, a generic elastic model and electronic structure modeling are applied to LHPs heterostructures with various layer thickness. We show that the relaxation of the interface strain is triggered by perovskite layers above a critical thickness. This leads to the release of the mechanical energy arising from the lattice mismatch, which nucleates the surface reorganization and may potentially induce the formation of previously observed lower energy edge states. These states, which are absent in three-dimensional perovskites are anticipated to play a crucial role in the design of LHPs for optoelectronic systems.

Original languageEnglish
Pages (from-to)5603-5609
Number of pages7
JournalNano Letters
Issue number9
Publication statusPublished - 12 Sep 2018
Externally publishedYes


  • density functional theory
  • exciton
  • Halide perovskites
  • lattice mismatch
  • layered materials
  • surface states


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