Interconversion between Free Charges and Bound Excitons in 2D Hybrid Lead Halide Perovskites

María C. Gélvez-Rueda, Eline M. Hutter, Duyen H. Cao, Nicolas Renaud, Constantinos C. Stoumpos, Joseph T. Hupp, Tom J. Savenije, Mercouri G. Kanatzidis, Ferdinand C. Grozema

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45 Citations (Scopus)

Abstract

The optoelectronic properties of hybrid perovskites can be easily tailored by varying their components. Specifically, mixing the common short organic cation (methylammonium (MA)) with a larger one (e.g., butyl ammonium (BA)) results in 2-dimensional perovskites with varying thicknesses of inorganic layers separated by the large organic cation. In both of these applications, a detailed understanding of the dissociation and recombination of electron-hole pairs is of prime importance. In this work, we give a clear experimental demonstration of the interconversion between bound excitons and free charges as a function of temperature by combining microwave conductivity techniques with photoluminescence measurements. We demonstrate that the exciton binding energy varies strongly (between 80 and 370 meV) with the thickness of the inorganic layers. Additionally, we show that the mobility of charges increases with the layer thickness, in agreement with calculated effective masses from electronic structure calculations.

Original languageEnglish
Pages (from-to)26566-26574
Number of pages9
JournalJournal of Physical Chemistry C
Volume121
Issue number47
DOIs
Publication statusPublished - Nov 30 2017

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Gélvez-Rueda, M. C., Hutter, E. M., Cao, D. H., Renaud, N., Stoumpos, C. C., Hupp, J. T., Savenije, T. J., Kanatzidis, M. G., & Grozema, F. C. (2017). Interconversion between Free Charges and Bound Excitons in 2D Hybrid Lead Halide Perovskites. Journal of Physical Chemistry C, 121(47), 26566-26574. https://doi.org/10.1021/acs.jpcc.7b10705