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Zhang B, Sun S, Jia Y, Dai J, Rathnayake DTN, Huang X, Casasent J, Adhikari G, Billy TA, Lu Y, Zeng XC, Guo Y. Simple Visualization of Universal Ferroelastic Domain Walls in Lead Halide Perovskites. Adv Mater 2023; 35:e2208336. [PMID: 36493380 DOI: 10.1002/adma.202208336] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 11/14/2022] [Indexed: 06/17/2023]
Abstract
Domain features and domain walls in lead halide perovskites (LHPs) have attracted broad interest due to their potential impact on optoelectronic properties of this unique class of solution-processable semiconductors. Using nonpolarized light and simple imaging configurations, ferroelastic twin domains and their switchings through multiple consecutive phase transitions are directly visualized. This direct optical contrast originates from finite optical reflections at the wall interface between two compositionally identical, orientationally different, optically anisotropic domains inside the material bulk. The findings show these domain walls serve as internal reflectors and steer energy transport inside halide perovskites optically. First-principles calculations show universal low domain-wall energies and modest energy barriers of domain switching, confirming their prevalent appearance, stable presence, and facile moving observed in the experiments. The generality of ferroelasticity in halide perovskites stems from their soft bonding characteristics. This work shows the feasibility of using LHP twin domain walls as optical guides of internal photoexcitations, capable of nonvolatile on-off switching and tunable positioning endowed by their universal ferroelasticity.
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Affiliation(s)
- Bo Zhang
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Shuo Sun
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Yinglu Jia
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Jun Dai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | | | - Xi Huang
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Jade Casasent
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
- School of Natural Sciences, St. Edward's University, Austin, TX, 78704, USA
| | - Gopi Adhikari
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Temban Acha Billy
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Yongfeng Lu
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
- Department of Materials Science & Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong
| | - Yinsheng Guo
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
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