Giant Electron–Phonon Coupling and Deep Conduction Band Resonance in Metal Halide Double Perovskite

ACS Nano ◽  
2018 ◽  
Vol 12 (8) ◽  
pp. 8081-8090 ◽  
Author(s):  
Julian A. Steele ◽  
Pascal Puech ◽  
Masoumeh Keshavarz ◽  
Ruoxi Yang ◽  
Subhasree Banerjee ◽  
...  
Keyword(s):  
Conduction Band ◽  
Double Perovskite ◽  
Metal Halide ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Harnessing Hot Phonon Bottleneck in Metal Halide Perovskite Nanocrystals via Interfacial Electron–Phonon Coupling

Nano Letters ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 4610-4617 ◽  
Author(s):  
Zhonghui Nie ◽  
Xuanzhao Gao ◽  
Yinjuan Ren ◽  
Siyang Xia ◽  
Yuhan Wang ◽  
...  
Keyword(s):  
Metal Halide ◽  
Phonon Coupling ◽  
Perovskite Nanocrystals ◽  
Phonon Bottleneck ◽  
Metal Halide Perovskite ◽  
Electron Phonon Coupling ◽  
Halide Perovskite

Lattice Dynamics and Electron–Phonon Coupling in Lead-Free Cs2AgIn1–xBixCl6 Double Perovskite Nanocrystals

2020 ◽  
Vol 11 (6) ◽  
pp. 2113-2120 ◽  
Author(s):  
Debjit Manna ◽  
Jiban Kangsabanik ◽  
Tapan Kumar Das ◽  
Debashish Das ◽  
Aftab Alam ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Double Perovskite ◽  
Lead Free ◽  
Phonon Coupling ◽  
Perovskite Nanocrystals ◽  
Electron Phonon Coupling

scholarly journals Two Topics of Optical Excitation Dynamics, Newly Unveiled by the Time- and Momentum-Resolved Photo-Electron Emission from the Conduction Band of GaAs: A Theoretical Review

2018 ◽  
Vol 8 (10) ◽  
pp. 1788
Author(s):  
Hiromasa Ohnishi ◽  
Norikazu Tomita
Keyword(s):  
Conduction Band ◽  
Electron Emission ◽  
Selection Rule ◽  
Optical Excitation ◽  
Phonon Coupling ◽  
Relaxation Dynamics ◽  
Infinite Time ◽  
Electron Phonon Coupling ◽  
Franck Condon ◽  
Restricted Selection

We review the recent two topics of optical excitation and relaxation dynamics, newly unveiled by the time- and momentum-resolved photo-electron emission from the conduction band of GaAs. One is the real-time collective relaxation dynamics, resulting in the Fermi degeneracy formation in the Γ valley. We show that it takes almost infinite time to realize the exact Fermi degeneracy, due to a restricted selection rule for the intravalley transition of the photo-excited electrons. The other is the spontaneous and instantaneous intervalley transition from the Γ valley to the L one. By considering the electron-phonon coupling before the photo-excitation, such spontaneous intervalley transition is realized within the framework of the Franck–Condon principle of the photo-excitation.

Exciton Dynamics and Electron–Phonon Coupling Affect the Photovoltaic Performance of the Cs2AgBiBr6 Double Perovskite

2018 ◽  
Vol 122 (45) ◽  
pp. 25940-25947 ◽  
Author(s):  
Robin Kentsch ◽  
Mirko Scholz ◽  
Jonas Horn ◽  
Derck Schlettwein ◽  
Kawon Oum ◽  
...  
Keyword(s):  
Photovoltaic Performance ◽  
Double Perovskite ◽  
Phonon Coupling ◽  
Exciton Dynamics ◽  
Electron Phonon Coupling

scholarly journals Ultrafast photo-induced enhancement of electron-phonon coupling in metal-halide perovskites

2021 ◽  
Author(s):  
Frédéric Laquai ◽  
Mingcong Wang ◽  
Yajun Gao ◽  
Kai Wang ◽  
Stefaan De Wolf
Keyword(s):  
Carrier Density ◽  
Metal Halide ◽  
Phonon Coupling ◽  
Debye Relaxation ◽  
Dynamic Disorder ◽  
Bandgap Narrowing ◽  
Electron Phonon Coupling ◽  
Excited Carrier ◽  
Halide Perovskites ◽  
Probe Spectroscopy

Abstract In metal-halide perovskites (MHPs), the nature of organic cations affects both, the perovskite’s structure and its optoelectronic properties. Using ultrafast pump-probe spectroscopy, we demonstrate that in state-of-the-art mixed-cation MHPs ultrafast photo-induced bandgap narrowing occurs, and linearly depends on the excited carrier density in the range from 1016 cm− 3 to above 1018 cm− 3. Furthermore, time-domain terahertz (td-THz) photoconductivity measurements reveal that the majority of carriers are localized and that the localization increases with the carrier density. Both observations, the bandgap narrowing and carrier localization, can be rationalized by ultrafast (sub-2ps) photo-induced enhancement of electron-phonon coupling, originating from dynamic disorder, as clearly evidenced by the presence of a Debye relaxation component in the terahertz photoconductivity spectra. The observation of photo-induced enhancement of electron-phonon coupling and dynamic disorder not only provides specific insight into the polaron-strain distribution of excited states in MHPs, but also adds to the development of a concise picture of the ultrafast physics of this important class of semiconductors.

scholarly journals Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure

2019 ◽  
Vol 4 (12) ◽  
pp. 2975-2982 ◽  
Author(s):  
Long Zhang ◽  
Yuanyuan Fang ◽  
Laizhi Sui ◽  
Jiejuan Yan ◽  
Kai Wang ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Lead Free ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6

2019 ◽  
Vol 7 (27) ◽  
pp. 8350-8356 ◽  
Author(s):  
S. J. Zelewski ◽  
J. M. Urban ◽  
A. Surrente ◽  
D. K. Maude ◽  
A. Kuc ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Metal Halide ◽  
Phonon Coupling ◽  
Photoluminescence Emission

The emission and absorption of Cs2AgBiBr6 are dominated by the strong carriers–phonon coupling.

Observation of Core Phonon in Electron–Phonon Coupling in Au25 Nanoclusters

2021 ◽  
Vol 12 (6) ◽  
pp. 1690-1695
Author(s):  
Zhongyu Liu ◽  
Yingwei Li ◽  
Wonyong Shin ◽  
Rongchao Jin
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Electron-phonon coupling in the magnetic Weyl semimetal ZrCo2Sn

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
I.Yu. Sklyadneva ◽  
R. Heid ◽  
P. M. Echenique ◽  
E. V. Chulkov
Keyword(s):  
Phonon Coupling ◽  
Weyl Semimetal ◽  
Electron Phonon Coupling

scholarly journals Dielectric screening in perovskite photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rui Su ◽  
Zhaojian Xu ◽  
Jiang Wu ◽  
Deying Luo ◽  
Qin Hu ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Low Voltage ◽  
Power Conversion ◽  
Surface Recombination ◽  
Open Circuit ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Dielectric Screening ◽  
Perovskite Photovoltaic ◽  
Reduced Surface

AbstractThe performance of perovskite photovoltaics is fundamentally impeded by the presence of undesirable defects that contribute to non-radiative losses within the devices. Although mitigating these losses has been extensively reported by numerous passivation strategies, a detailed understanding of loss origins within the devices remains elusive. Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling. All of these boost the power conversion efficiency to 22.3% for an inverted perovskite photovoltaic device with a high open-circuit voltage of 1.25 V and a low voltage deficit of 0.37 V (a bandgap ~1.62 eV). Our results provide not only an in-depth understanding of the carrier capture processes in perovskites, but also a promising pathway for realizing highly efficient devices via dielectric regulation.

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