Infrared Dielectric Screening Determines the Low Exciton Binding Energy of Metal-Halide Perovskites

2018 ◽  
Vol 9 (3) ◽  
pp. 620-627 ◽  
Author(s):  
Paolo Umari ◽  
Edoardo Mosconi ◽  
Filippo De Angelis
Keyword(s):  
Binding Energy ◽  
Exciton Binding Energy ◽  
Metal Halide ◽  
Dielectric Screening ◽  
Halide Perovskites

Exciton Binding Energy and the Nature of Emissive States in Organometal Halide Perovskites

2015 ◽  
Vol 6 (15) ◽  
pp. 2969-2975 ◽  
Author(s):  
Kaibo Zheng ◽  
Qiushi Zhu ◽  
Mohamed Abdellah ◽  
Maria E. Messing ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Binding Energy ◽  
Exciton Binding Energy ◽  
Halide Perovskites

Absorption F-Sum Rule for the Exciton Binding Energy in Methylammonium Lead Halide Perovskites

2015 ◽  
Vol 6 (22) ◽  
pp. 4566-4572 ◽  
Author(s):  
Nicola Sestu ◽  
Michele Cadelano ◽  
Valerio Sarritzu ◽  
Feipeng Chen ◽  
Daniela Marongiu ◽  
...  
Keyword(s):  
Binding Energy ◽  
Exciton Binding Energy ◽  
Sum Rule ◽  
Halide Perovskites ◽  
Lead Halide

Polaronic exciton binding energy in iodide and bromide organic-inorganic lead halide perovskites

2015 ◽  
Vol 107 (23) ◽  
pp. 231902 ◽  
Author(s):  
Arman Mahboubi Soufiani ◽  
Fuzhi Huang ◽  
Peter Reece ◽  
Rui Sheng ◽  
Anita Ho-Baillie ◽  
...  
Keyword(s):  
Binding Energy ◽  
Exciton Binding Energy ◽  
Inorganic Lead ◽  
Halide Perovskites ◽  
Lead Halide

scholarly journals Direct measurement of the exciton binding energy and effective masses for charge carriers in organic–inorganic tri-halide perovskites

2015 ◽  
Vol 11 (7) ◽  
pp. 582-587 ◽  
Author(s):  
Atsuhiko Miyata ◽  
Anatolie Mitioglu ◽  
Paulina Plochocka ◽  
Oliver Portugall ◽  
Jacob Tse-Wei Wang ◽  
...  
Keyword(s):  
Binding Energy ◽  
Direct Measurement ◽  
Exciton Binding Energy ◽  
Charge Carriers ◽  
Effective Masses ◽  
Halide Perovskites

scholarly journals Dielectric Screening Modulates Semicondcutor Nanoplatelet Excitons

2021 ◽  
Author(s):  
Ashley Shin ◽  
Azmain A. Hossain ◽  
Stephanie M. Tenney ◽  
Xuanheng Tan ◽  
Lauren A. Tan ◽  
...  
Keyword(s):  
Binding Energy ◽  
Relative Effect ◽  
Binding Energies ◽  
Exciton Binding Energy ◽  
Electrostatic Model ◽  
Excitonic Absorption ◽  
2D Semiconductors ◽  
Dielectric Screening ◽  
Device Properties ◽  
First Time

The influence of external dielectric environments is well understood for 2D semiconductor materials but is overlooked for colloidally-grown II-VI nanoplatelets (NPLs). In this work, we synthesize MX (M=Cd, Hg; X= Se, Te) NPLs of varying thicknesses, and apply a modified Elliott model to fit excitonic absorption features and report exciton binding energies for cadmium telluride and mercury chalcogenides for the first time. Our observations indicate that the exciton binding energy is modulated by the dielectric screening of semiconductor material by the external ligand environment. Furthermore, NPL binding energies show a dependence on the number of monolayers consistent with relative effect of internal vs. external dielectric. To describe this, we derive an analytical electrostatic model, reinforcing the hypothesis that the external environment increases the exciton binding energy relative to the bulk—due to the distortion of the Coulombic potential across the NPL surface. We further confirm this effect by decreasing and recovering the exciton binding energy of HgTe NPLs through washing in polarizable solvents. Our results illustrate that NPLs are colloidal analogues of Van der Waals 2D semiconductors and point to surface modification as an approach to control photophysics and device properties.

Sign in / Sign up

Export Citation Format

Share Document