TY - JOUR
T1 - Structural Dynamics of Two-Dimensional Ruddlesden-Popper Perovskites
T2 - A Computational Study
AU - Fridriksson, Magnus B.
AU - Maheshwari, Sudeep
AU - Grozema, Ferdinand C.
PY - 2020
Y1 - 2020
N2 - Recently two-dimensional (2D) hybrid organic-inorganic perovskites have attracted a lot of interest as more stable analogues of their three-dimensional counterparts for optoelectronic applications. However, a thorough understanding of the effect that this reduced dimensionality has on dynamical and structural behavior of individual parts of the perovskite is currently lacking. We have used molecular dynamics simulations to investigate the structure and dynamics of 2D Ruddlesden-Popper perovskite with the general formula BA2MAn-1PbnI3n+1, where BA is butylammonium, MA is methylammonium, and n is the number of lead-iodide layers. We discuss the dynamic behavior of both the inorganic and the organic part and compare between the different 2D structures. We show that the rigidness of the inorganic layer markedly increases with the number of lead-iodide layers and that low-temperature structural phase changes accompanied by tilting of the octahedra occurs in some but not all structures. Furthermore, the dynamic behavior of the MA ion is significantly affected by the number of inorganic layers, involving changes both in the reorientation times and in the occurrence of specific preferred orientations.
AB - Recently two-dimensional (2D) hybrid organic-inorganic perovskites have attracted a lot of interest as more stable analogues of their three-dimensional counterparts for optoelectronic applications. However, a thorough understanding of the effect that this reduced dimensionality has on dynamical and structural behavior of individual parts of the perovskite is currently lacking. We have used molecular dynamics simulations to investigate the structure and dynamics of 2D Ruddlesden-Popper perovskite with the general formula BA2MAn-1PbnI3n+1, where BA is butylammonium, MA is methylammonium, and n is the number of lead-iodide layers. We discuss the dynamic behavior of both the inorganic and the organic part and compare between the different 2D structures. We show that the rigidness of the inorganic layer markedly increases with the number of lead-iodide layers and that low-temperature structural phase changes accompanied by tilting of the octahedra occurs in some but not all structures. Furthermore, the dynamic behavior of the MA ion is significantly affected by the number of inorganic layers, involving changes both in the reorientation times and in the occurrence of specific preferred orientations.
UR - http://www.scopus.com/inward/record.url?scp=85096226531&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.0c05225
DO - 10.1021/acs.jpcc.0c05225
M3 - Article
AN - SCOPUS:85096226531
SN - 1932-7447
VL - 124
SP - 22096
EP - 22104
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 40
ER -