posted on 2024-02-19, 21:47authored byHang Lyu, Haibin Su, Zhenyang Lin
The phase transformation from δ- to α-CsPbI3has garnered extensive research interest. However, detailed
understanding
of this structural transformation at atomistic scale remains elusive.
Here, we reported the full atomistic molecular dynamics simulation
of this important phase transformation using an enhanced sampling
method, Metadynamics (MetaD). Particularly, two-stage of dynamic transformation
related to [PbI3]− chains’ motions
was observed, namely, the intrachain rearrangement followed by interchain
connection. Moreover, the dynamic motion of Cs+ cations
plays an important role in
facilitating the interchain connection kinetically. The insights reported
in this work will provide valuable guidance for further advancing
the understanding of phase transformation of CsPbI3.