Abstract
Understanding and controlling the formation and dynamics of ferroelastic domains can be key to enhance metal halide perovskite device performance, but established methods lack spatial control at the level of single domains. Here, the authors induced the formation of ferroelastic domains in CsPbBr${}_{3}$ nanowires using an atomic force microscope tip, and studied the structural changes using nanofocused x-ray diffraction with a 60-nm beam. The applied stress locally induced lattice tilts that define room temperature-stable ferroelastic domains, which spread spatially and terminated at {112}-type domain walls. While pristine regions show an orthorhombic (004) reflection; regions exposed to higher forces exhibit {220}-type reflections.
Highlights
Metal halide perovskites (MHPs) have attracted great interest in the scientific community in the last years, mostly owing to their potential applications in next-generation solar cells, laser devices, and photodetectors [1,2,3,4,5]
We induce the formation of ferroelastic domains in CsPbBr3 nanowires at room temperature using an atomic force microscope (AFM) tip and visualize the domains using nanofocused x-ray diffraction with a 60 nm beam
The ability to control the formation of ferroelastic domains in MHP single crystals can open possibilities for optoelectronic applications and experimental materials science [3,28]
Summary
Metal halide perovskites (MHPs) have attracted great interest in the scientific community in the last years, mostly owing to their potential applications in next-generation solar cells, laser devices, and photodetectors [1,2,3,4,5]. MHP nanocrystals have additional degrees of freedom compared with their bulk counterparts and can show excellent brightness and narrow-band photoluminescence (PL) quantum yield [6,7,8] Such advantages, together with the ability to tune the emission wavelength by varying their sizes, make nanowires of CsPbBr3, a compound in this class that exhibits good radiation stability, especially promising for future optoelectronic applications [9,10]. The application of an external electric field can switch the polarization of domains [22], while ferroelastic twins can be induced via temperature variation [19] or stress [20]. The ability to control the formation of ferroelastic domains in MHP single crystals can open possibilities for optoelectronic applications and experimental materials science [3,28]
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