Bandgap and exciton binding energies in lead-iodide-based natural quantum-well crystals
By Ken'ichiro Tanaka, T. Kondo. 2003
188 citations recorded by the source corpus.
Abstract We have performed optical absorption and electroabsorption studies on the lead-iodide-based natural quantum-well perovskite-type crystals with different well width (C6H13NH3)2(CH3NH3)m21PbmI3mþ1. With decreasing well thickness, m; the resonance energies of the lowest-energy excitons shift to higher energy due to the increase of the bandgap. The binding energies and oscillator strengths of the excitons drastically increase due to the spatial confinement and image charge effect with decreasing m: The bandgap of (C6H13NH3)2(CH3NH3)m21- PbmI3mþ1 (m ≥ 2) can be reproduced by the effective-mass approximations, while the effective-mass approach is not valid for (C6H13NH3)2PbI4 (m = 1).
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7454704817c853b6baba29099438a9ae35ee6bfb
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Citations in the corpus
- Photoelectronic Responses in Solution-Processed Perovskite CH$_{\bf 3}$ NH$_{\bf 3}$PbI $_{\bf 3}$ Solar Cells Studied by Photoluminescence and Photoabsorption Spectroscopy (2015, result): “However, this exciton binding energy is much smaller than that given by previous reports, which had results in the range of 37–50 meV [15]–[17].”
- High Members of the 2D Ruddlesden-Popper Halide Perovskites: Synthesis, Optical Properties, and Solar Cells of (CH3(CH2)3NH3)2(CH3NH3)4Pb5I16 (2017, background): “Notably, in the present study, the band-gap variation as a function of n in RP compounds was pushed beyond n = 4, offering further insights into the effects of carrier confinement.(41) The excitonic”