Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Exceptional elastic anisotropy of hybrid organic-inorganic perovskite CH3NH3PbBr3 measured by laser ultrasonic technique

Abstract : The results of the direct experimental evaluation of all elastic constants of single crystal hybrid organic–inorganic perovskite (HOIP) methylammonium lead bromide, a material known due to its possible solar‐energy, optoelectronics, X‐ray detector and thermoelectricity applications, are reported. The measurements of anisotropic elasticity of CH3NH3PbBr3by the technique of laser ultrasonics demonstrate that properties of HOIPs can be even more remarkable than the theoretical expectations: the extracted shear modulus is more than twice smaller, the universal anisotropy is more than twice higher, while the Debye temperature is more than 50° lower. Thus HOIPs can exhibit extremely low shear rigidity and extremely high anisotropy, both strongly overrunning the parameters which have been expected based on earlier first principles theoretical predictions. A simple theoretical model of granular crystal indicates that these observations could be related to the contributions of rotations/tilts of PbBr6octahedra to elastic response of cubic CH3NH3PbBr3. Another experimental observation is strong stiffening of shear rigidity with temperature increase from its room value up to 120 °C. Discovered elastic properties of HOIPs characterize them as exceptionally ductile/flexible/adaptive materials which could be deposited on corrugated/structured surfaces.
Liste complète des métadonnées

https://hal-univ-lemans.archives-ouvertes.fr/hal-02535995
Contributeur : Vitali Goussev Connectez-vous pour contacter le contributeur
Soumis le : mardi 7 avril 2020 - 19:05:57
Dernière modification le : lundi 3 mai 2021 - 17:27:44

Lien texte intégral

Identifiants

Collections

Citation

Alexey Lomonosov, Xiaoliang Yan, Chuanxiang Sheng, Vitali Goussev, Chenyin Ni, et al.. Exceptional elastic anisotropy of hybrid organic-inorganic perovskite CH3NH3PbBr3 measured by laser ultrasonic technique. physica status solidi (RRL) - Rapid Research Letters, Wiley-VCH Verlag, 2016, 10 (8), pp.606-612. ⟨10.1002/pssr.201600156⟩. ⟨hal-02535995⟩

Partager

Métriques

Consultations de la notice

65