Real time observation of photo-instability of ternary-halide mixed CH3NH3Pb(Br1-x-yClxIy)3 perovskite: Preferential diffusion of small halide ions

Se Yun Kim; Sangwook Lee; Weon Sik Chae; Joon Hyung Lee; Young Woo Heo

doi:10.1016/j.jallcom.2019.151716

Real time observation of photo-instability of ternary-halide mixed CH₃NH₃Pb(Br_1-x-yCl_xI_y)₃ perovskite: Preferential diffusion of small halide ions

Se Yun Kim, Sangwook Lee, Weon Sik Chae, Joon Hyung Lee, Young Woo Heo

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

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Abstract

In this study, we attempted to improve the optical stability via the complicated design of the X site composition of CH₃NH₃Pb(Br_1-x-yCl_xI_y)₃, such as CH₃NH₃Pb(Br_0.5I_0.5)₃ and CH₃NH₃Pb(Br_0.5Cl_0.25I_0.25)₃. It was observed that photo-stability improvement via the complicated design of the X site composition of CH₃NH₃Pb(Br_1-x-yCl_xI_y)₃ would not occur. I-rich phase which was remained phase after small halide ion (Br or/and Cl) extraction was unavoidably formed through the preferential extraction of small halide ions, and this can be explained by the spinodal decomposition mechanism. Comparing the excitation dynamics of MAPb(Br_0.5I_0.5)₃ and MAPb(Br_0.5I_0.25Cl_0.25)₃, we could expect that the excitation dynamics would be relatively complicated in the presence of Cl. The reason for this is explained by the effect of mixed mobile ions, i.e., small ions are more easily diffused than large ions.

Original language	English
Article number	151716
Journal	Journal of Alloys and Compounds
Volume	808
DOIs	https://doi.org/10.1016/j.jallcom.2019.151716
State	Published - 5 Nov 2019

Keywords

Mixed halide perovskite
Mixed mobile ions effect
Phase separation
Photo-instability
Spinodal decomposition model

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@article{0b15fb66ac8246efa02ee41df6eca57c,

title = "Real time observation of photo-instability of ternary-halide mixed CH3NH3Pb(Br1-x-yClxIy)3 perovskite: Preferential diffusion of small halide ions",

abstract = "In this study, we attempted to improve the optical stability via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3, such as CH3NH3Pb(Br0.5I0.5)3 and CH3NH3Pb(Br0.5Cl0.25I0.25)3. It was observed that photo-stability improvement via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3 would not occur. I-rich phase which was remained phase after small halide ion (Br or/and Cl) extraction was unavoidably formed through the preferential extraction of small halide ions, and this can be explained by the spinodal decomposition mechanism. Comparing the excitation dynamics of MAPb(Br0.5I0.5)3 and MAPb(Br0.5I0.25Cl0.25)3, we could expect that the excitation dynamics would be relatively complicated in the presence of Cl. The reason for this is explained by the effect of mixed mobile ions, i.e., small ions are more easily diffused than large ions.",

keywords = "Mixed halide perovskite, Mixed mobile ions effect, Phase separation, Photo-instability, Spinodal decomposition model",

author = "Kim, {Se Yun} and Sangwook Lee and Chae, {Weon Sik} and Lee, {Joon Hyung} and Heo, {Young Woo}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = nov,

day = "5",

doi = "10.1016/j.jallcom.2019.151716",

language = "English",

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TY - JOUR

T1 - Real time observation of photo-instability of ternary-halide mixed CH3NH3Pb(Br1-x-yClxIy)3 perovskite

T2 - Preferential diffusion of small halide ions

AU - Kim, Se Yun

AU - Lee, Sangwook

AU - Chae, Weon Sik

AU - Lee, Joon Hyung

AU - Heo, Young Woo

PY - 2019/11/5

Y1 - 2019/11/5

N2 - In this study, we attempted to improve the optical stability via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3, such as CH3NH3Pb(Br0.5I0.5)3 and CH3NH3Pb(Br0.5Cl0.25I0.25)3. It was observed that photo-stability improvement via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3 would not occur. I-rich phase which was remained phase after small halide ion (Br or/and Cl) extraction was unavoidably formed through the preferential extraction of small halide ions, and this can be explained by the spinodal decomposition mechanism. Comparing the excitation dynamics of MAPb(Br0.5I0.5)3 and MAPb(Br0.5I0.25Cl0.25)3, we could expect that the excitation dynamics would be relatively complicated in the presence of Cl. The reason for this is explained by the effect of mixed mobile ions, i.e., small ions are more easily diffused than large ions.

AB - In this study, we attempted to improve the optical stability via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3, such as CH3NH3Pb(Br0.5I0.5)3 and CH3NH3Pb(Br0.5Cl0.25I0.25)3. It was observed that photo-stability improvement via the complicated design of the X site composition of CH3NH3Pb(Br1-x-yClxIy)3 would not occur. I-rich phase which was remained phase after small halide ion (Br or/and Cl) extraction was unavoidably formed through the preferential extraction of small halide ions, and this can be explained by the spinodal decomposition mechanism. Comparing the excitation dynamics of MAPb(Br0.5I0.5)3 and MAPb(Br0.5I0.25Cl0.25)3, we could expect that the excitation dynamics would be relatively complicated in the presence of Cl. The reason for this is explained by the effect of mixed mobile ions, i.e., small ions are more easily diffused than large ions.

KW - Mixed halide perovskite

KW - Mixed mobile ions effect

KW - Phase separation

KW - Photo-instability

KW - Spinodal decomposition model

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DO - 10.1016/j.jallcom.2019.151716

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SN - 0925-8388

VL - 808

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Real time observation of photo-instability of ternary-halide mixed CH₃NH₃Pb(Br_1-x-yCl_xI_y)₃ perovskite: Preferential diffusion of small halide ions

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