Title :

Size and solvation effects on electronic and optical properties of PbS quantum dots

Author(s) :

Sklénard, Benoît [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information [CEA-LETI]
Mugny, Gabriel [Auteur]
STMicroelectronics [Grenoble] [ST-GRENOBLE]
Chehaibou, Bilal [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Physique - IEMN [PHYSIQUE - IEMN]
Arnaud, Arthur [Auteur]
STMicroelectronics [Crolles] [ST-CROLLES]
Li, Jing [Auteur correspondant]
Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information [CEA-LETI]

Journal title :

Journal of Physical Chemistry Letters

Pages :

9044-9050

Publisher :

American Chemical Society

Publication date :

2022-09-23

ISSN :

1948-7185

English keyword(s) :

Binding energy
Electrical properties
Polarization
Quantum dots
Solvents

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]

English abstract : [en]

PbS quantum dots (QDs), among the most mature nanocrystals obtained by colloidal chemistry, are promising candidates in optoelectronic applications at various operational frequencies. QD device performances are often ...
Show more >PbS quantum dots (QDs), among the most mature nanocrystals obtained by colloidal chemistry, are promising candidates in optoelectronic applications at various operational frequencies. QD device performances are often determined by charge transport, either carrier injection before photoemission or charge detection after photoabsorption, which is significantly influenced by the dielectric environment. Here, we present the electronic structure and the optical gap of PbS QDs versus size for various solvents calculated using ab initio methods including the many-body perturbation approaches. This study highlights the importance of the dielectric environment, pointing out 1) the non-negligible shift of the electronic structure due to the ground state polarization; 2) a substantial impact on the electronic bandgap. The electron-hole binding energy, which varies largely with the QD size and solvent, is well-described by 1 an electrostatic model. This study reveals the fundamental physics of size and solvation effects, which could be useful to design PbS QDs-based optoelectronic devices.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL