Volume 15, Issue 21 1900219
Full Paper

Strain-Mediated Phase Stabilization: A New Strategy for Ultrastable α-CsPbI3 Perovskite by Nanoconfined Growth

Sunihl Ma

Sunihl Ma

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Seong Hun Kim

Seong Hun Kim

Department of Materials Science and Engineering and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea

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Beomjin Jeong

Beomjin Jeong

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Hyeok-Chan Kwon

Hyeok-Chan Kwon

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Seong-Cheol Yun

Seong-Cheol Yun

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Gyumin Jang

Gyumin Jang

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Hyunha Yang

Hyunha Yang

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Cheolmin Park

Cheolmin Park

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

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Donghwa Lee

Corresponding Author

Donghwa Lee

Department of Materials Science and Engineering and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea

E-mail: [email protected], [email protected]Search for more papers by this author
Jooho Moon

Corresponding Author

Jooho Moon

Department of Materials Science and Engineering, Yonsei University, Seoul, 03722 Republic of Korea

E-mail: [email protected], [email protected]Search for more papers by this author
First published: 04 April 2019
Citations: 87

Abstract

All-inorganic cesium lead triiodide (CsPbI3) perovskite is considered a promising solution-processable semiconductor for highly stable optoelectronic and photovoltaic applications. However, despite its excellent optoelectronic properties, the phase instability of CsPbI3 poses a critical hurdle for practical application. In this study, a novel stain-mediated phase stabilization strategy is demonstrated to significantly enhance the phase stability of cubic α-phase CsPbI3. Careful control of the degree of spatial confinement induced by anodized aluminum oxide (AAO) templates with varying pore sizes leads to effective manipulation of the phase stability of α-CsPbI3. The Williamson–Hall method in conjunction with density functional theory calculations clearly confirms that the strain imposed on the perovskite lattice when confined in vertically aligned nanopores can alter the formation energy of the system, stabilizing α-CsPbI3 at room temperature. Finally, the CsPbI3 grown inside nanoporous AAO templates exhibits exceptional phase stability over three months under ambient conditions, in which the resulting light-emitting diode reveals a natural red color emission with very narrow bandwidth (full width at half maximum of 33 nm) at 702 nm. The universally applicable template-based stabilization strategy can give in-depth insights on the strain-mediated phase transition mechanism in all-inorganic perovskites.

Conflict of Interest

The authors declare no conflict of interest.

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