Optical properties due to electronic transitions in two-dimensional semiconductors (CnH2n+1NH3)2PbI4

Teruya Ishihara, Jun Takahashi, Takenari Goto

Research output: Contribution to journalArticle

456 Citations (Scopus)

Abstract

Optical spectra in the visible and uv regions are investigated in layer-type perovskite compounds (CnH2n+1NH3)PbI4 with n=4, 6, 8, 9, 10, and 12. The spacing between the PbI4 layers changes from 15.17 for n=4 to 24.51 for n=12. In spite of these different spacings, the optical spectra are almost the same for these compounds, which means that the interaction between the layers is weak. The lowest exciton is located at 2.56 eV at 1.6 K, and its oscillator strength and binding energy are 0.7 per formula unit and 320 meV, respectively. These values are very large compared with those in a three-dimensional analog PbI2. The large oscillator strength and binding energy can be explained by the small dielectric constant of the alkylammonium "barrier layer, which strengthens the Coulomb interaction between an electron and a hole.

Original languageEnglish
Pages (from-to)11099-11107
Number of pages9
JournalPhysical Review B
Volume42
Issue number17
DOIs
Publication statusPublished - 1990 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Optical properties due to electronic transitions in two-dimensional semiconductors (CnH2n+1NH3)2PbI4'. Together they form a unique fingerprint.

  • Cite this