TY - JOUR
T1 - Visualization of dynamic polaronic strain fields in hybrid lead halide perovskites
AU - Guzelturk, Burak
AU - Winkler, Thomas
AU - Van de Goor, Tim W.J.
AU - Smith, Matthew D.
AU - Bourelle, Sean A.
AU - Feldmann, Sascha
AU - Trigo, Mariano
AU - Teitelbaum, Samuel W.
AU - Steinrück, Hans Georg
AU - de la Pena, Gilberto A.
AU - Alonso-Mori, Roberto
AU - Zhu, Diling
AU - Sato, Takahiro
AU - Karunadasa, Hemamala I.
AU - Toney, Michael F.
AU - Deschler, Felix
AU - Lindenberg, Aaron M.
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature Limited 2021.
PY - 2021/5
Y1 - 2021/5
N2 - Excitation localization involving dynamic nanoscale distortions is a central aspect of photocatalysis1, quantum materials2 and molecular optoelectronics3. Experimental characterization of such distortions requires techniques sensitive to the formation of point-defect-like local structural rearrangements in real time. Here, we visualize excitation-induced strain fields in a prototypical member of the lead halide perovskites4 via femtosecond resolution diffuse X-ray scattering measurements. This enables momentum-resolved phonon spectroscopy of the locally distorted structure and reveals radially expanding nanometre-scale strain fields associated with the formation and relaxation of polarons in photoexcited perovskites. Quantitative estimates of the magnitude and shape of this polaronic distortion are obtained, providing direct insights into the dynamic structural distortions that occur in these materials5–9. Optical pump–probe reflection spectroscopy corroborates these results and shows how these large polaronic distortions transiently modify the carrier effective mass, providing a unified picture of the coupled structural and electronic dynamics that underlie the optoelectronic functionality of the hybrid perovskites.
AB - Excitation localization involving dynamic nanoscale distortions is a central aspect of photocatalysis1, quantum materials2 and molecular optoelectronics3. Experimental characterization of such distortions requires techniques sensitive to the formation of point-defect-like local structural rearrangements in real time. Here, we visualize excitation-induced strain fields in a prototypical member of the lead halide perovskites4 via femtosecond resolution diffuse X-ray scattering measurements. This enables momentum-resolved phonon spectroscopy of the locally distorted structure and reveals radially expanding nanometre-scale strain fields associated with the formation and relaxation of polarons in photoexcited perovskites. Quantitative estimates of the magnitude and shape of this polaronic distortion are obtained, providing direct insights into the dynamic structural distortions that occur in these materials5–9. Optical pump–probe reflection spectroscopy corroborates these results and shows how these large polaronic distortions transiently modify the carrier effective mass, providing a unified picture of the coupled structural and electronic dynamics that underlie the optoelectronic functionality of the hybrid perovskites.
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U2 - 10.1038/s41563-020-00865-5
DO - 10.1038/s41563-020-00865-5
M3 - Article
C2 - 33398119
AN - SCOPUS:85098759748
SN - 1476-1122
VL - 20
SP - 618
EP - 623
JO - Nature materials
JF - Nature materials
IS - 5
ER -