Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation

Zhen Li; Kai Zhu; Xiaojia Zheng; Congcong Wu; Shikhar Jha; Shashank Priya

doi:10.1021/acsenergylett.6b00457

Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation

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

Chemistry and Nanoscience

Virginia Tech

Research output: Contribution to journal › Article › peer-review

390 Scopus Citations

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 language	American English
Pages (from-to)	1014-1020
Number of pages	7
Journal	ACS Energy Letters
Volume	1
Issue number	5
DOIs	https://doi.org/10.1021/acsenergylett.6b00457 https://doi.org/10.1021/acsenergylett.6b00457
State	Published - 11 Nov 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

NREL/JA-5900-68061

Keywords

formamidinium lead triiodide perovskite
instability mechanisms
solar cells

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title = "Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation",

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.",

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author = "Zhen Li and Kai Zhu and Xiaojia Zheng and Congcong Wu and Shikhar Jha and Shashank Priya",

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T1 - Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation

AU - Li, Zhen

AU - Zhu, Kai

AU - Zheng, Xiaojia

AU - Wu, Congcong

AU - Jha, Shikhar

AU - Priya, Shashank

PY - 2016/11/11

Y1 - 2016/11/11

N2 - 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.

AB - 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.

KW - formamidinium lead triiodide perovskite

KW - instability mechanisms

KW - solar cells

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SP - 1014

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JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 5

ER -

Improved Phase Stability of Formamidinium Lead Triiodide Perovskite by Strain Relaxation

Abstract

Bibliographical note

NREL Publication Number

Keywords

UN SDGs

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