Atomically thin two-dimensional organic-inorganic hybrid perovskites

• Autores: Letian Dou, Andrew B. Wong, Yi Yu
• Localización: Science, ISSN 0036-8075, Vol. 349, Nº 6255, 2015, págs. 1518-1521
• Idioma: inglés
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• Resumen

  • 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.