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Impact of Layer Thickness on the Charge Carrier and Spin Coherence Lifetime in Two-Dimensional Layered Perovskite Single Crystals

Journal Article · · ACS Energy Letters
In this paper, we report the charge carrier recombination rate and spin coherence lifetimes in single crystals of two-dimensional (2D) Ruddlesden–Popper perovskites PEA2PbI4·(MAPbI3)n-1 (PEA, phenethylammonium; MA, methylammonium; n = 1, 2, 3, 4). Layer thickness-dependent charge carrier recombination rates are observed, with the fastest rates for n = 1 because of the large exciton binding energy, and the slowest rates are observed for n = 2. Room-temperature spin coherence times also show a nonmonotonic layer thickness dependence with an increasing spin coherence lifetime with increasing layer thickness from n = 1 to n = 4, followed by a decrease in lifetime from n = 4 to ∞. The longest coherence lifetime of ~7 ps is observed in the n = 4 sample. Our results are consistent with two contributions: Rashba splitting increases the spin coherence lifetime going from the n = ∞ to the layered systems, while phonon scattering, which increases for smaller layers, decreases the spin coherence lifetime. Finally, the interplay between these two factors contributes to the layer thickness dependence.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1471290
Report Number(s):
NREL/JA--5900-71748
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 9 Vol. 3; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Incorporating Large A Cations into Lead Iodide Perovskite Cages: Relaxed Goldschmidt Tolerance Factor and Impact on Exciton–Phonon Interaction journal July 2019
Improving Charge Transport via Intermediate‐Controlled Crystal Growth in 2D Perovskite Solar Cells journal April 2019
Ruddlesden–Popper Perovskites: Synthesis and Optical Properties for Optoelectronic Applications journal October 2019
Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells journal July 2019
Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two-Dimensional Perovskite Solar Cells journal July 2019
Biexciton Auger Recombination Differs in Hybrid and Inorganic Halide Perovskite Quantum Dots journal December 2017
Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells journal January 2020
Long-range exciton transport and slow annihilation in two-dimensional hybrid perovskites journal January 2020
Upconverted excitonic photoluminescence from a two-dimensional lead-halide perovskite journal December 2019
Long-lived charge separation in two-dimensional ligand-perovskite heterostructures journal January 2020
Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites journal December 2019

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