Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation

Xiaojia Zheng, Congcong Wu, Shikhar K. Jha, Zhen Li, Kai Zhu, Shashank Priya

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Though formamidinium lead triiodide (FAPbI3) possesses a suitable band gap and good thermal stability, the phase transition from the pure black perovskite phase (α-phase) to the undesirable yellow nonperovskite polymorph (δ-phase) at room temperature, especially under humid air, hinders its practical application. Here, we investigate the intrinsic instability mechanism of the α-phase at ambient temperature and demonstrate the existence of an anisotropic strained lattice in the (111) plane that drives phase transformation into the δ-phase. Methylammonium bromide (MABr) alloying (or FAPbI3-MABr) was found to cause lattice contraction, thereby balancing the lattice strain. This led to dramatic improvement in the stability of α-FAPbI3. Solar cells fabricated using FAPbI3-MABr demonstrated significantly enhanced stability under the humid air.

Original languageEnglish (US)
Pages (from-to)1014-1020
Number of pages7
JournalACS Energy Letters
Volume1
Issue number5
DOIs
StatePublished - Nov 11 2016

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Strain relaxation
Phase stability
Bromides
Perovskite
Lead
Phase transitions
Air
Polymorphism
Alloying
Solar cells
Energy gap
Thermodynamic stability
Temperature
perovskite
methylamine
formamidine

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this

Zheng, Xiaojia ; Wu, Congcong ; Jha, Shikhar K. ; Li, Zhen ; Zhu, Kai ; Priya, Shashank. / Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation. In: ACS Energy Letters. 2016 ; Vol. 1, No. 5. pp. 1014-1020.
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Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation. / Zheng, Xiaojia; Wu, Congcong; Jha, Shikhar K.; Li, Zhen; Zhu, Kai; Priya, Shashank.

In: ACS Energy Letters, Vol. 1, No. 5, 11.11.2016, p. 1014-1020.

Research output: Contribution to journalArticle

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AU - Wu, Congcong

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AU - Priya, Shashank

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