Time-Dependent Mechanical Response of APbX3 (A = Cs, CH3NH3; X = I, Br) Single Crystals

Marcos A. Reyes-Martinez, Ahmed L. Abdelhady, Makhsud I. Saidaminov, Duck Young Chung, Osman M. Bakr, Mercouri G Kanatzidis, Wole O. Soboyejo, Yueh Lin Loo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The ease of processing hybrid organic-inorganic perovskite (HOIPs) films, belonging to a material class with composition ABX3, from solution and at mild temperatures promises their use in deformable technologies, including flexible photovoltaic devices, sensors, and displays. To successfully apply these materials in deformable devices, knowledge of their mechanical response to dynamic strain is necessary. The authors elucidate the time- and rate-dependent mechanical properties of HOIPs and an inorganic perovskite (IP) single crystal by measuring nanoindentation creep and stress relaxation. The observation of pop-in events and slip bands on the surface of the indented crystals demonstrate dislocation-mediated plastic deformation. The magnitudes of creep and relaxation of both HOIPs and IPs are similar, negating prior hypothesis that the presence of organic A-site cations alters the mechanical response of these materials. Moreover, these samples exhibit a pronounced increase in creep, and stress relaxation as a function of indentation rate whose magnitudes reflect differences in the rates of nucleation and propagation of dislocations within the crystal structures of HOIPs and IP. This contribution provides understanding that is critical for designing perovskite devices capable of withstanding mechanical deformations.

Original languageEnglish
JournalAdvanced Materials
DOIs
Publication statusAccepted/In press - 2017

Fingerprint

Perovskite
Single crystals
Creep
Stress relaxation
Dislocations (crystals)
Nanoindentation
perovskite
Indentation
Cations
Plastic deformation
Nucleation
Crystal structure
Positive ions
Display devices
Mechanical properties
Sensors
Processing
Chemical analysis

Keywords

  • Dynamic mechanical behavior
  • Hybrid perovskites
  • Nanoindentation
  • Single crystals
  • Viscoplasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Reyes-Martinez, M. A., Abdelhady, A. L., Saidaminov, M. I., Chung, D. Y., Bakr, O. M., Kanatzidis, M. G., ... Loo, Y. L. (Accepted/In press). Time-Dependent Mechanical Response of APbX3 (A = Cs, CH3NH3; X = I, Br) Single Crystals. Advanced Materials. https://doi.org/10.1002/adma.201606556

Time-Dependent Mechanical Response of APbX3 (A = Cs, CH3NH3; X = I, Br) Single Crystals. / Reyes-Martinez, Marcos A.; Abdelhady, Ahmed L.; Saidaminov, Makhsud I.; Chung, Duck Young; Bakr, Osman M.; Kanatzidis, Mercouri G; Soboyejo, Wole O.; Loo, Yueh Lin.

In: Advanced Materials, 2017.

Research output: Contribution to journalArticle

Reyes-Martinez, MA, Abdelhady, AL, Saidaminov, MI, Chung, DY, Bakr, OM, Kanatzidis, MG, Soboyejo, WO & Loo, YL 2017, 'Time-Dependent Mechanical Response of APbX3 (A = Cs, CH3NH3; X = I, Br) Single Crystals', Advanced Materials. https://doi.org/10.1002/adma.201606556
Reyes-Martinez, Marcos A. ; Abdelhady, Ahmed L. ; Saidaminov, Makhsud I. ; Chung, Duck Young ; Bakr, Osman M. ; Kanatzidis, Mercouri G ; Soboyejo, Wole O. ; Loo, Yueh Lin. / Time-Dependent Mechanical Response of APbX3 (A = Cs, CH3NH3; X = I, Br) Single Crystals. In: Advanced Materials. 2017.
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