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Ultrafast terahertz snapshots of excitonic Rydberg states and electronic coherence in an organometal halide perovskite

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms15565· OSTI ID:1363630

How photoexcitations evolve into Coulomb-bound electron and hole pairs, called excitons, and unbound charge carriers is a key cross-cutting issue in photovoltaics and optoelectronics. Until now, the initial quantum dynamics following photoexcitation remains elusive in the hybrid perovskite system. Furthermore we reveal excitonic Rydberg states with distinct formation pathways by observing the multiple resonant, internal quantum transitions using ultrafast terahertz quasi-particle transport. Nonequilibrium emergent states evolve with a complex co-existence of excitons, carriers and phonons, where a delayed buildup of excitons under on- and off-resonant pumping conditions allows us to distinguish between the loss of electronic coherence and hot state cooling processes. The nearly ~1 ps dephasing time, efficient electron scattering with discrete terahertz phonons and intermediate binding energy of ~13.5 meV in perovskites are distinct from conventional photovoltaic semiconductors. In addition to providing implications for coherent energy conversion, these are potentially relevant to the development of light-harvesting and electron-transport devices.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1363630
Report Number(s):
IS-J--9302; ncomms15565
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Slow cooling of hot polarons in halide perovskite solar cells text January 2017
Perovskite Excitonics: Primary Exciton Creation and Crossover from Free Carriers to a Secondary Exciton Phase journal December 2017
Recent Progress in Metal Halide Perovskite Micro‐ and Nanolasers journal April 2019
Free Carrier, Exciton, and Phonon Dynamics in Lead‐Halide Perovskites Studied with Ultrafast Terahertz Spectroscopy journal August 2019
Lead‐Free Semiconductors: Soft Chemistry, Dimensionality Control, and Manganese‐Doping of Germanium Halide Perovskites journal January 2019
Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals journal October 2019
Assignment of Terahertz Modes in Hydroquinone Clathrates journal January 2020
Effect of phase transition stress on the photoluminescence of perovskite CH3NH3PbI3 microwires journal December 2018
Bimolecular recombination in methylammonium lead triiodide perovskite is an inverse absorption process journal January 2018
Ultrafast transition between exciton phases in van der Waals heterostructures journal April 2019
Identification of high-temperature exciton states and their phase-dependent trapping behaviour in lead halide perovskites journal January 2018
The role of excitons in 3D and 2D lead halide perovskites journal January 2019
Carrier diffusion in thin-film CH 3 NH 3 PbI 3 perovskite measured using four-wave mixing journal September 2017
Helicity-dependent terahertz photocurrent and phonon dynamics in hybrid metal halide perovskites journal December 2019
Mapping of the dark exciton landscape in transition metal dichalcogenides journal July 2018
Nonequilibrium Pair Breaking in Ba ( Fe 1 − x Co x ) 2 As 2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State journal December 2018
Anomalous variations of spectral linewidth in internal excitonic quantum transitions of ultrafast resonantly excited single-walled carbon nanotubes journal February 2019
Carrier Diffusion in Thin-Film CH3NH3PbI3 Perovskite Measured using Four-Wave Mixing text January 2017
Mapping of the dark exciton landscape in transition metal dichalcogenides text January 2018
Ultrafast transition between exciton phases in van der Waals heterostructures text January 2019

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