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Atomically thin two-dimensional organic-inorganic hybrid perovskites.

  • Author(s): Dou, Letian;
  • Wong, Andrew B;
  • Yu, Yi;
  • Lai, Minliang;
  • Kornienko, Nikolay;
  • Eaton, Samuel W;
  • Fu, Anthony;
  • Bischak, Connor G;
  • Ma, Jie;
  • Ding, Tina;
  • Ginsberg, Naomi S;
  • Wang, Lin-Wang;
  • Alivisatos, A Paul;
  • Yang, Peidong
  • et al.
Abstract

Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid perovskites of (C4H9NH3)2PbBr4 with well-defined square shape and large size. In contrast to other 2D materials, the hybrid perovskite sheets exhibit an unusual structural relaxation, and this structural change leads to a band gap shift as compared to the bulk crystal. The high-quality 2D crystals exhibit efficient photoluminescence, and color tuning could be achieved by changing sheet thickness as well as composition via the synthesis of related materials.

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