TY - JOUR
T1 - Dual lattice incommensurabilities and enhanced lattice perfection by low-temperature thermal annealing in photoelectric
(CH3NH3)PbBr3
AU - Li, Wen-Hsien
AU - Lee, Chi-Hung
AU - Ling, Tsu-Yin
AU - Ma, Ma-Hsuan
AU - Wei, Pai-Chun
AU - He, Jr-Hau
AU - Wu, Chun-Min
AU - Peng, Jen-Chih
AU - Xu, Guangyong
AU - Zhao, Yang
AU - Lynn, Jeffrey W.
N1 - KAUST Repository Item: Exported on 2021-02-24
Acknowledgements: This work was supported by the Ministry of Science and Technology, Taiwan under Grant No. MOST 109-2112-M-008-027. We acknowledge the Ministry of Science and Technology, Taiwan for financial support through Grant No. MOST-108-2739-M-213-001 from the National Synchrotron Radiation Research Center (NSRRC) Neutron Cultivation Program, and for providing the neutron scattering facility used
in this work.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - The coupling between the organic CH3NH3+ cations and inorganic perovskite PbBr3– framework in a large single crystal of (CH3NH3)PbBr3 weighing 13 g was studied using neutron diffraction and inelastic neutron scattering. Two lattice incommensurate (ICM) phases were found; one at higher temperatures, marked ICMHT, appeared between 150 and 134 K. The second one, marked ICMLT, developed below 143 K and remained at 75 K. The transition from the ICMLT to ICMHT phase upon warming gave rise to extremely large lattice shrinking, followed by extremely large lattice expansion of the tetragonal basal plane of the PbBr3 lattice. There was a progressive decrease in the width of the diffuse peak at the Bragg position from the PbBr3– lattice upon warming, which can be described using a critical exponent to show complete ordering of the atoms into a (CH3NH3 )PbBr3 lattice at 200 K. (CH3NH3 )PbBr3 exhibits six definitive acousticlike phonon branches at 75 K. The six branches reconstruct into two at 200 K, with the frequencies of both the transverse and longitudinal
modes greatly enhanced. The asymmetric structure of the CH3NH3 ions together with the indirect interactions between the CH3NH3 ions mediated through the Br ions are used to understand the observed behaviors.
AB - The coupling between the organic CH3NH3+ cations and inorganic perovskite PbBr3– framework in a large single crystal of (CH3NH3)PbBr3 weighing 13 g was studied using neutron diffraction and inelastic neutron scattering. Two lattice incommensurate (ICM) phases were found; one at higher temperatures, marked ICMHT, appeared between 150 and 134 K. The second one, marked ICMLT, developed below 143 K and remained at 75 K. The transition from the ICMLT to ICMHT phase upon warming gave rise to extremely large lattice shrinking, followed by extremely large lattice expansion of the tetragonal basal plane of the PbBr3 lattice. There was a progressive decrease in the width of the diffuse peak at the Bragg position from the PbBr3– lattice upon warming, which can be described using a critical exponent to show complete ordering of the atoms into a (CH3NH3 )PbBr3 lattice at 200 K. (CH3NH3 )PbBr3 exhibits six definitive acousticlike phonon branches at 75 K. The six branches reconstruct into two at 200 K, with the frequencies of both the transverse and longitudinal
modes greatly enhanced. The asymmetric structure of the CH3NH3 ions together with the indirect interactions between the CH3NH3 ions mediated through the Br ions are used to understand the observed behaviors.
UR - http://hdl.handle.net/10754/667599
UR - https://link.aps.org/doi/10.1103/PhysRevMaterials.5.025401
U2 - 10.1103/physrevmaterials.5.025401
DO - 10.1103/physrevmaterials.5.025401
M3 - Article
SN - 2475-9953
VL - 5
JO - Physical Review Materials
JF - Physical Review Materials
IS - 2
ER -