Many-body dynamics and exciton formation studied by time-resolved photoluminescence

Hoyer, W.; Ell, C.; Kira, M.; Koch, S. W.; Chatterjee, Sangam; Mosor, S.; Khitrova, G.; Gibbs, H. M.; Stolz, H.

doi:10.1103/physrevb.72.075324

Cited by 33 publications

(21 citation statements)

References 35 publications

(56 reference statements)

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“…We infer that the transition to the excitonic gas predicted by the Saha equation is inhibited by nonlinear effects 44 (see Supplementary Fig. 6), such as screening and renormalization of the exciton binding energy 51 or simply because the quantum kinetics of the bound and unbound pairs does not allow for reaching the thermal equilibrium between the two gas phases 52,53 . Finally, according to a full many-body treatment of the photophysics of a correlated electron-hole plasma, a population of unbound electrons and holes can contribute to the luminescence at ' o ¼ E X , even though no exciton population is really formed 54 .…”

Section: Discussionmentioning

confidence: 99%

Correlated electron–hole plasma in organometal perovskites

et al. 2014

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Organic-inorganic perovskites are a class of solution-processed semiconductors holding promise for the realization of low-cost efficient solar cells and on-chip lasers. Despite the recent attention they have attracted, fundamental aspects of the photophysics underlying device operation still remain elusive. Here we use photoluminescence and transmission spectroscopy to show that photoexcitations give rise to a conducting plasma of unbound but Coulomb-correlated electron-hole pairs at all excitations of interest for light-energy conversion and stimulated optical amplification. The conductive nature of the photoexcited plasma has crucial consequences for perovskite-based devices: in solar cells, it ensures efficient charge separation and ambipolar transport while, concerning lasing, it provides a low threshold for light amplification and justifies a favourable outlook for the demonstration of an electrically driven laser. We find a significant trap density, whose cross-section for carrier capture is however low, yielding a minor impact on device performance.

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Section: Discussionmentioning

confidence: 99%

Correlated electron–hole plasma in organometal perovskites

et al. 2014

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“…The temperature T of the e-h system during its cooldown remains significantly higher than the lattice temperature T latt for several hundreds of picoseconds in the low-temperature experiments [4][5][6]8,13 . As a result, the dynamics of T determines the exciton fraction and many important properties of the system.…”

Section: Introductionmentioning

confidence: 83%

Polariton linewidth and the reservoir temperature dynamics in a semiconductor microcavity

Belykh

Sob’yanin

2014

Phys. Rev. B

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A method of determining the temperature of the nonradiative reservoir in a microcavity excitonpolariton system is developed. A general relation for the homogeneous polariton linewidth is theoretically derived and experimentally used in the method. In experiments with a GaAs microcavity under nonresonant pulsed excitation, the reservoir temperature dynamics is extracted from the polariton linewidth. Within the first nanosecond the reservoir temperature greatly exceeds the lattice temperature and determines the dynamics of the major processes in the system. It is shown that, for nonresonant pulsed excitation of GaAs microcavities, the polariton Bose-Einstein condensation is typically governed by polariton-phonon scattering, while interparticle scattering leads to condensate depopulation.

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“…Since excitonic features significantly influence the semiconductor PL [5,28,29], strong THz fields can be used to modify the optical luminescence in semiconductors by transferring excitons into higher energy states and storing them there for an extended time [30]. If the THz excitation energy is chosen to be resonant with the 1s-2p-exciton transition, the 1s population is transferred into the optically dark 2p state, which partially depletes the 1s state resulting in a reduction of the respective PL intensity.…”

Section: Thz Manipulation Of the Secondary Emission And The Influencementioning

confidence: 99%

Terahertz-induced exciton signatures in semiconductors

Böttge

Koch

Schneebeli

et al. 2013

Phys. Status Solidi B

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This paper discusses recent studies involving time‐resolved optical and terahertz (THz) fields in the linear and nonlinear regime. An overview of the microscopic modeling scheme is presented and applied to analyze a variety of experimental results. The examples include coherent excitons in weak and strong THz fields, Rabi splitting and ionization of intra‐excitonic transitions, THz studies in semiconductor microcavities, and the THz manipulation of excitonic transitions.

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Many-body dynamics and exciton formation studied by time-resolved photoluminescence

Cited by 33 publications

References 35 publications

Correlated electron–hole plasma in organometal perovskites

Correlated electron–hole plasma in organometal perovskites

Polariton linewidth and the reservoir temperature dynamics in a semiconductor microcavity

Terahertz-induced exciton signatures in semiconductors

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