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Title: Impact of metal n s 2 lone pair on luminescence quantum efficiency in low-dimensional halide perovskites

Journal Article · · Physical Review Materials
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4]
  1. Beihang University, Beijing (China)
  2. East China Normal University, Shanghai (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. East China Normal University, Shanghai (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Based on first-principles calculations, we show that chemically active metal ns2 lone pairs play an important role in exciton relaxation and dissociation in low-dimensional halide perovskites. Here, we studied excited-state properties of several recently discovered luminescent all-inorganic and hybrid organic-inorganic zero-dimensional (0D) Sn and Pb halides. The results show that, despite the similarity in ground-state electronic structure between Sn and Pb halide perovskites, the chemically more active Sn2+ lone pair leads to stronger excited-state structural distortion and larger Stokes shift in Sn halides. The enhanced Stokes shift hinders excitation energy transport, which reduces energy loss to defects and increases the photoluminescence quantum efficiency. Finally, the presence of the ns2 metal cations in the 0D halide perovskites also promotes the exciton dissociation into electron and hole polarons especially in all-inorganic compounds, in which the coupling between metal-halide clusters is significant.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1502553
Alternate ID(s):
OSTI ID: 1499071
Journal Information:
Physical Review Materials, Vol. 3, Issue 3; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (5)

Ruddlesden–Popper Perovskites: Synthesis and Optical Properties for Optoelectronic Applications journal October 2019
Colloidal syntheses of zero-dimensional Cs 4 SnX 6 (X = Br, I) nanocrystals with high emission efficiencies journal January 2020
Zero-dimensional metal oxide Li 4 TiO 4 journal January 2019
Electronic shell structures, self-trapped excitons, and defect-bound excitons in Li 2 B 12 H 12 journal January 2019
Microscopic origin of multiple exciton emission in low-dimensional lead halide perovskites journal November 2019

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