Probing femtosecond lattice displacement upon photo-carrier generation in lead halide perovskite View Full Text


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Article Info

DATE

2018-12

AUTHORS

Giovanni Batignani, Giuseppe Fumero, Ajay Ram Srimath Kandada, Giulio Cerullo, Marina Gandini, Carino Ferrante, Annamaria Petrozza, Tullio Scopigno

ABSTRACT

Electronic properties and lattice vibrations are expected to be strongly correlated in metal-halide perovskites, due to the soft fluctuating nature of their crystal lattice. Thus, unveiling electron-phonon coupling dynamics upon ultrafast photoexcitation is necessary for understanding the optoelectronic behavior of the semiconductor. Here, we use impulsive vibrational spectroscopy to reveal vibrational modes of methylammonium lead-bromide perovskite under electronically resonant and non-resonant conditions. We identify two excited state coherent phonons at 89 and 106 cm-1, whose phases reveal a shift of the potential energy minimum upon ultrafast photocarrier generation. This indicates the transition to a new geometry, reached after approximately 90 fs, and fully equilibrated within the phonons lifetime of about 1 ps. Our results unambiguously prove that these modes drive the crystalline distortion occurring upon photo-excitation, demonstrating the presence of polaronic effects. More... »

PAGES

1971

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-04367-6

DOI

http://dx.doi.org/10.1038/s41467-018-04367-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103956843

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29773798


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