Transient X-ray Diffraction Reveals Nonequilibrium Phase Transition in Thin Films of CH3NH3PbI3 Perovskite
Journal Article
·
· ACS Energy Letters
- Northwestern Univ., Evanston, IL (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Advantageous optoelectronic properties of methylammonium lead triiodide likely arise from coupling between photogenerated charge-carriers and the soft, deformable lattice. We investigate structural dynamics of MAPbI3 films using time-resolved X-ray diffraction versus pump-probe time delay and pump intensity. During the first nanosecond, the lattice anisotropically distorts from tetragonal to cubic at excitation intensities that are insufficient to thermally induce the first-order thermodynamic phase transition at 330K. Further, the high-symmetry structure then relaxes back to the starting phase with 11 and 236-ns time constants via a different transition pathway than observed either in the first nanosecond or in previous reports for MAPbI3. Early-time dynamics are consistent with polaron formation and lattice strain stabilization while the slower recovery dynamics outlive radiative recombination and relates metastability. Fluence-independence of these lattice deformations in the low-power regime conveys relevance to optoelectronics including photovoltaics and highlights sustained involvement of non-equilibrium, photoinduced lattice reorganization in MAPbI3 under functional conditions.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; SC0012541
- OSTI ID:
- 2348918
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 1 Vol. 8; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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