Piezoelectric Modulation of Excitonic Properties in Monolayer WSe2 under Strong Dielectric Screening

ACS Nano ◽  
2021 ◽  
Author(s):  
Kanak Datta ◽  
Zidong Li ◽  
Zhengyang Lyu ◽  
Parag B. Deotare
Keyword(s):  
Dielectric Screening ◽  
Excitonic Properties

scholarly journals Dielectric screening in perovskite photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rui Su ◽  
Zhaojian Xu ◽  
Jiang Wu ◽  
Deying Luo ◽  
Qin Hu ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Low Voltage ◽  
Power Conversion ◽  
Surface Recombination ◽  
Open Circuit ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Dielectric Screening ◽  
Perovskite Photovoltaic ◽  
Reduced Surface

AbstractThe performance of perovskite photovoltaics is fundamentally impeded by the presence of undesirable defects that contribute to non-radiative losses within the devices. Although mitigating these losses has been extensively reported by numerous passivation strategies, a detailed understanding of loss origins within the devices remains elusive. Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling. All of these boost the power conversion efficiency to 22.3% for an inverted perovskite photovoltaic device with a high open-circuit voltage of 1.25 V and a low voltage deficit of 0.37 V (a bandgap ~1.62 eV). Our results provide not only an in-depth understanding of the carrier capture processes in perovskites, but also a promising pathway for realizing highly efficient devices via dielectric regulation.

scholarly journals Influence of π -conjugated cations and halogen substitution on the optoelectronic and excitonic properties of layered hybrid perovskites

2018 ◽  
Vol 2 (10) ◽  
Author(s):  
Joshua Leveillee ◽  
Claudine Katan ◽  
Liujiang Zhou ◽  
Aditya D. Mohite ◽  
Jacky Even ◽  
...  
Keyword(s):  
Excitonic Properties

scholarly journals LayerPCM: An implicit scheme for dielectric screening from layered substrates

2021 ◽  
Vol 154 (22) ◽  
pp. 224114
Author(s):  
Jannis Krumland ◽  
Gabriel Gil ◽  
Stefano Corni ◽  
Caterina Cocchi
Keyword(s):  
Implicit Scheme ◽  
Dielectric Screening

scholarly journals The Schottky–Mott Rule Expanded for Two-Dimensional Semiconductors: Influence of Substrate Dielectric Screening

ACS Nano ◽  
2021 ◽  
Author(s):  
Soohyung Park ◽  
Thorsten Schultz ◽  
Dongguen Shin ◽  
Niklas Mutz ◽  
Areej Aljarb ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dielectric Screening ◽  
Influence Of Substrate

Optoelectronic response and excitonic properties of monolayer MoS2

2016 ◽  
Vol 120 (5) ◽  
pp. 051707 ◽  
Author(s):  
Imen Ben Amara ◽  
Emna Ben Salem ◽  
Sihem Jaziri
Keyword(s):  
Monolayer Mos2 ◽  
Excitonic Properties

scholarly journals How two-dimensional brick layer J-aggregates differ from linear ones: Excitonic properties and line broadening mechanisms

2016 ◽  
Vol 144 (13) ◽  
pp. 134310 ◽  
Author(s):  
Arend G. Dijkstra ◽  
Hong-Guang Duan ◽  
Jasper Knoester ◽  
Keith A. Nelson ◽  
Jianshu Cao
Keyword(s):  
Two Dimensional ◽  
Line Broadening ◽  
J Aggregates ◽  
Excitonic Properties

Excitonic properties of type-I and type-II Si∕Si1−xGex quantum wells

2007 ◽  
Vol 101 (11) ◽  
pp. 113703 ◽  
Author(s):  
Andrey Chaves ◽  
J. Costa e Silva ◽  
J. A. K. Freire ◽  
G. A. Farias
Keyword(s):  
Quantum Wells ◽  
Type I ◽  
Type Ii ◽  
Excitonic Properties
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