Strain‐Mediated Phase Stabilization: A New Strategy for Ultrastable α‐CsPbI3 Perovskite by Nanoconfined Growth
- 4 April 2019
- Vol. 15 (21), e1900219
- https://doi.org/10.1002/smll.201900219
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.Keywords
Funding Information
- National Research Foundation of Korea (2012R1A3A2026417)
- Ministry of Science, ICT and Future Planning
This publication has 67 references indexed in Scilit:
- High-Performance Next-Generation Perovskite Nanocrystal Scintillator for Nondestructive X-Ray ImagingAdvanced Materials, 2018
- All-inorganic perovskite nanocrystal scintillatorsNature, 2018
- High Performance and Stable All‐Inorganic Metal Halide Perovskite‐Based Photodetectors for Optical Communication ApplicationsAdvanced Materials, 2018
- Perovskite-based photodetectors: materials and devicesChemical Society Reviews, 2017
- Iodide management in formamidinium-lead-halide–based perovskite layers for efficient solar cellsScience, 2017
- Flexible Hybrid Organic–Inorganic Perovskite MemoryACS Nano, 2016
- High-Performance Organolead Halide Perovskite-Based Self-Powered Triboelectric PhotodetectorACS Nano, 2015
- Why Lead Methylammonium Tri-Iodide Perovskite-Based Solar Cells Require a Mesoporous Electron Transporting Scaffold (but Not Necessarily a Hole Conductor)Nano Letters, 2014
- The origin of high efficiency in low-temperature solution-processable bilayer organometal halide hybrid solar cellsEnergy & Environmental Science, 2013
- Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH 3 NH 3 PbI 3Science, 2013