scholarly journals Monitoring Electron–Phonon Interactions in Lead Halide Perovskites Using Time-Resolved THz Spectroscopy

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 8826-8835 ◽  
Author(s):  
Daming Zhao ◽  
Hongwei Hu ◽  
Reinhard Haselsberger ◽  
Rudolph A. Marcus ◽  
Maria-Elisabeth Michel-Beyerle ◽  
...  
Keyword(s):  
Thz Spectroscopy ◽  
Time Resolved ◽  
Halide Perovskites ◽  
Lead Halide

scholarly journals Ultrafast correlated charge and lattice motion in a hybrid metal halide perovskite

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw5558 ◽  
Author(s):  
Yang Lan ◽  
Benjamin J. Dringoli ◽  
David A. Valverde-Chávez ◽  
Carlito S. Ponseca ◽  
Mark Sutton ◽  
...  
Keyword(s):  
Room Temperature ◽  
Longitudinal Optical ◽  
Metal Halide ◽  
Thz Spectroscopy ◽  
Time Resolved ◽  
Carrier Lifetimes ◽  
Metal Halide Perovskite ◽  
Coherent Coupling ◽  
Halide Perovskites ◽  
Correlated Motion

Hybrid organic-inorganic halide perovskites have shown remarkable optoelectronic properties, exhibiting an impressive tolerance to defects believed to originate from correlated motion of charge carriers and the polar lattice forming large polarons. Few experimental techniques are capable of directly probing these correlations, requiring simultaneous sub–millielectron volt energy and femtosecond temporal resolution after absorption of a photon. Here, we use time-resolved multi-THz spectroscopy, sensitive to the internal excitations of the polaron, to temporally and energetically resolve the coherent coupling of charges to longitudinal optical phonons in single-crystal CH3NH3PbI3 (MAPI). We observe room temperature intraband quantum beats arising from the coherent displacement of charge from the coupled phonon cloud. Our measurements provide strong evidence for the existence of polarons in MAPI at room temperature, suggesting that electron/hole-phonon coupling is a defining aspect of the hybrid metal-halide perovskites contributing to the protection from scattering and enhanced carrier lifetimes that define their usefulness in devices.

scholarly journals Large polaron evidence in the ultrafast THz response of Lead-Halide Perovskites

2019 ◽  
Vol 205 ◽  
pp. 04019
Author(s):  
Eugenio Cinquanta ◽  
Daniele Meggiolaro ◽  
Silvia G. Motti ◽  
Marina Gandini ◽  
Marcelo Alcocer ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Charge Transport ◽  
Dielectric Response ◽  
Thz Spectroscopy ◽  
Inorganic Lead ◽  
Large Polaron ◽  
Halide Perovskites ◽  
Lead Halide

We unveil the large polaron fingerprints in the transient THz dielectric response of lead-halide perovskites. We clarify the mechanism underlying the physics of charge transport of full-inorganic lead-halide perovskites by combining ultrafast Thz spectroscopy with DFT calculations.

Spectral dependence of direct and trap-mediated recombination processes in lead halide perovskites using time resolved microwave conductivity

2016 ◽  
Vol 18 (17) ◽  
pp. 12043-12049 ◽  
Author(s):  
Joanna A. Guse ◽  
Arman M. Soufiani ◽  
Liangcong Jiang ◽  
Jincheol Kim ◽  
Yi-Bing Cheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Spectral Dependence ◽  
Charge Carriers ◽  
Microwave Conductivity ◽  
Time Resolved ◽  
Recombination Processes ◽  
Halide Perovskites ◽  
Lead Halide

Elucidating the decay mechanisms of photoexcited charge carriers is key to improving the efficiency of solar cells based on organo-lead halide perovskites.

scholarly journals Momentarily trapped exciton polaron in two-dimensional lead halide perovskites

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Weijian Tao ◽  
Chi Zhang ◽  
Qiaohui Zhou ◽  
Yida Zhao ◽  
Haiming Zhu
Keyword(s):  
Three Dimensional ◽  
Two Dimensional ◽  
Phonon Coupling ◽  
Phonon Interaction ◽  
Time Resolved ◽  
Exciting Potential ◽  
Low Energy Tail ◽  
Halide Perovskites ◽  
Lead Halide ◽  
Excitonic Feature

AbstractTwo-dimensional (2D) lead halide perovskites with distinct excitonic feature have shown exciting potential for optoelectronic applications. Compared to their three-dimensional counterparts with large polaron character, how the interplay between long- and short- range exciton-phonon interaction due to polar and soft lattice define the excitons in 2D perovskites is yet to be revealed. Here, we seek to understand the nature of excitons in 2D CsPbBr3 perovskites by static and time-resolved spectroscopy which is further rationalized with Urbach-Martienssen rule. We show quantitatively an intermediate exciton-phonon coupling in 2D CsPbBr3 where exciton polarons are momentarily self-trapped by lattice vibrations. The 0.25 ps ultrafast interconversion between free and self-trapped exciton polaron with a barrier of ~ 34 meV gives rise to intrinsic asymmetric photoluminescence with a low energy tail at room temperature. This study reveals a complex and dynamic picture of exciton polarons in 2D perovskites and emphasizes the importance to regulate exciton-phonon coupling.

THERMAL TRANSPORT BEHAVIORS IN LEAD HALIDE PEROVSKITES

2018 ◽  
Author(s):  
Wee-Liat Ong ◽  
Giselle Elbaz ◽  
Evan A. Doud ◽  
Philip Kim ◽  
Daniel Paley ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Halide Perovskites ◽  
Lead Halide

Revealing the Impact of Cesium/Rubidium Incorporation on the Photophysics of Multiple-Cation Lead Halide Perovskites

2019 ◽  
Author(s):  
Yajun Gao ◽  
Kai wang ◽  
mingcong wang ◽  
Jafar Khan ◽  
Ahmed Balawi ◽  
...  
Keyword(s):  
Halide Perovskites ◽  
The Impact ◽  
Lead Halide

Shedding Light on Optoelectronic Structure Rationalization and Photophysical Pathways in Lead Halide Perovskites - a Single Crystal Story

2018 ◽  
Author(s):  
Masoumeh Keshavarz ◽  
Steffen Wiedmann ◽  
Robert Küchler ◽  
Haifeng Yuan ◽  
Elke Debroye ◽  
...  
Keyword(s):  
Single Crystal ◽  
Halide Perovskites ◽  
Lead Halide
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