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Title: Dynamically Disordered Lattice in a Layered Pb-I-SCN Perovskite Thin Film Probed by Two-Dimensional Infrared Spectroscopy

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b03787· OSTI ID:1788259

The dynamically flexible lattices in lead-halide perovskites may play important roles in extending carrier recombination lifetime in 3D perovskite solar-cell absorbers and in exciton self-trapping in 2D perovskite white-light phosphors. Here, two-dimensional infrared (2D IR) spectroscopy was applied to study a recently reported Pb-I-SCN layered perovskite. The Pb-ISCN perovskite was spin-coated on a SiO2 surface as a thin film, with a thickness of ~100 nm, where the S12CN anions were isotopically diluted with the ratio of S12CN:S13CN=5:95 or 1:99 to avoid vibrational coupling and excitation transfer between adjacent SCN anions. The minor S12CN component was the principal vibrational probe that reported on the structural evolution through 2D IR spectroscopy. Spectral diffusion was observed with a time constant of 4.1 ± 0.3 ps. Spectral diffusion arises from small structural changes that result in sampling of frequencies within the distribution of frequencies that comprise the inhomogeneously broadened absorption spectrum of the in the Pb-I-SCN layered perovskite. These transitions among discrete local structures are distinct from oscillatory phonon motions of the lattice. To accurately evaluate the structural dynamics through measurement of spectral diffusion, the vibrational coupling between adjacent SCN anions had to be carefully treated. Although the inorganic layers of typical 2D perovskites are structurally isolated from each other, the 2D IR data demonstrated that the layers of the Pb-I-SCN perovskite are vibrationally coupled. When both S12CN and S13CN were pumped simultaneously, cross-peaks between S12CN and S13CN vibrations and an oscillating 2D band shape of the S12CN vibration were observed. Both observables demonstrate vibrational coupling between the closest SCN anions, which reside in different inorganic layers. The thin films and the isotopic dilution produced exceedingly small vibrational echo signal fields; measurements were made possible using the near-Brewster’s angle reflection pump-probe geometry.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
FG02-84ER13251; FG03-84ER13251; FA9550-16-1-0104
OSTI ID:
1788259
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 31; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Pseudohalide (SCN )-doped CsPbI 3 for high-performance solar cells journal January 2019

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