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Spatial-temporal spectroscopy characterizations and electronic structure of methylammonium perovskites
- Source :
- MRS Communications. 8:961-969
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Using time-resolved laser-scanning confocal microscopy and ultrafast optical pump/THz probe spectroscopy, we measure photoluminescence (PL) and THz-conductivity in perovskite micro-crystals and films. PL quenching and lifetime variations occur from local heterogeneity. Ultrafast THz-spectra measure sharp quantum transitions from excitonic Rydberg states, providing weakly bound excitons with a binding energy of ~13.5 meV at low temperatures. Ab-initio electronic structure calculations give a direct band gap of 1.64 eV, a dielectric constant of ~18, heavy electrons, and light holes, resulting in weakly bound excitons, consistent with the binding energies from the experiment. The complementary spectroscopy and simulations reveal fundamental insights into perovskite light-matter interactions.
- Subjects :
- Photoluminescence
Materials science
Exciton
Binding energy
Physics::Optics
02 engineering and technology
Electronic structure
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
0104 chemical sciences
Condensed Matter::Materials Science
symbols.namesake
Rydberg formula
symbols
General Materials Science
Direct and indirect band gaps
0210 nano-technology
Spectroscopy
Perovskite (structure)
Subjects
Details
- ISSN :
- 21596867 and 21596859
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- MRS Communications
- Accession number :
- edsair.doi...........45e11bd33a67a3be5d1f109b1d0db66b