Broadband Transient Absorption Study of Photoexcitations in Lead Halide Perovskites: Towards a Multiband Picture

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Broadband Transient Absorption Study of Photoexcitations in Lead Halide Perovskites: Towards a Multiband Picture

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Title: Broadband Transient Absorption Study of Photoexcitations in Lead Halide Perovskites: Towards a Multiband Picture
Author(s):
Anand, Benoy (UT Dallas);
Sampat, Siddharth (UT Dallas);
Danilov, E. O.;
Peng, Weina (UT Dallas);
Rupich, Sara M. (UT Dallas);
Chabal, Yves J. (UT Dallas);
Gartstein, Yuri N. (UT Dallas);
Malko, Anton V. (UT Dallas)
Item Type: article
Keywords: Show Keywords
Description: Includes supplementary material.
Abstract: Ultrafast transient pump-probe measurements of thin CH₃NH₃PbI₃ perovskite films over a wide spectral range from 350 to 800 nm reveal a family of photoinduced bleach (PB) and absorption (PA) features unequivocally pointing to the fundamentally multiband character of the underlying electronic structure. Excitation pump-energy dependent kinetics of three long-lived PB peaks at 1.65, 2.55, and 3.15 eV along with a broad PA band shows the involvement of band-edge thermalized carriers in all transitions and at least four, possibly more, electronic bands. The evolution of the transient signatures is described in terms of the redistribution of the conserved oscillator strength of the whole system. The multiband perspective opens up different directions for understanding and controlling photoexcitations in hybrid perovskites.
Publisher: American Physical Society
ISSN: 1098-0121
Persistent Link: http://dx.doi.org/10.1103/PhysRevB.93.161205
http://hdl.handle.net/10735.1/5605
Bibliographic Citation: Anand, B., S. Sampat, E. O. Danilov, W. Peng, et al. 2016. "Broadband transient absorption study of photoexcitations in lead halide perovskites: Towards a multiband picture." Physical Review B - Condensed Matter and Materials Physics 93(16), doi:10.1103/PhysRevB.93.161205
Terms of Use: ©2016 American Physical Society. All rights reserved.
Sponsors: US Department of Energy Office of Science BES Award No. DE-SC0010697

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