Titre :

Nanoscale Studies at the Early Stage of Water-Induced Degradation of CH 3 NH 3 PbI 3 Perovskite Films Used for Photovoltaic Applications

Auteur(s) :

Llacer, Jaume [Auteur]
Moerman, David [Auteur]
Douheŕet, Olivier [Auteur]
Noirfalise, Xavier [Auteur]
Quarti, Claudio [Auteur]
Lazzaroni, Roberto [Auteur]
Théron, Didier [Auteur]
Nano and Microsystems - IEMN [NAM6 - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Leclere, Philippe [Auteur]

Titre de la revue :

ACS Applied Nano Materials

Pagination :

8268–8277

Éditeur :

American Chemical Society

Date de publication :

2020-08-28

ISSN :

2574-0970

Mot(s)-clé(s) en anglais :

hybrid perovskite
defects
stability
kelvin probe force microscopy
surface properties

Discipline(s) HAL :

Chimie/Matériaux

Résumé en anglais : [en]

Understanding the surface properties of hybrid perovskite materials is a key aspect to improve not only the interface properties in photovoltaic cells but also the stability against moisture degradation. In this work, we ...
Lire la suite >Understanding the surface properties of hybrid perovskite materials is a key aspect to improve not only the interface properties in photovoltaic cells but also the stability against moisture degradation. In this work, we study the local electronic properties of two series of CH 3 NH 3 PbI 3 perovskite films by atomic force microscopybased methods. We correlate nanoscale features such as the local surface potential (as measured by Kelvin probe force microscopy) to the current response (as measured by conductive atomic force microscopy). CH 3 NH 3 PbI 3 perovskites made using lead acetate as a precursor result in films with high purity and crystallinity and also result in heterogeneous local electrical properties, attributed to variations in the density of surface states. In contrast, when using lead iodide as a precursor, the perovskite surface exhibits a uniform distribution of surface states. This work also aims to understand the early stages of water-induced degradation at the surface of those films. Through high-precision exposure to small amounts of water vapor, we observe a higher stability for surfaces prepared with lead iodide precursors. More importantly, each precursor-based fabrication route is associated with either nor p-type behavior of the films. These characteristics are determined by the type of surface states, which also and eventually preside over stability. This work should help discriminate between perovskite synthesis routes and improve their stability in photovoltaic cell applications.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

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

Source :

Harvested from HAL