Coherent coupling between exciton resonances governed by the disorder potential

Glinka, Yuri D.; Sun, Zheng; Erementchouk, Mikhail; Bristow, Alan D.; Cundiff, Steven T.; Bracker, Allan S.; Li, Xiaoqin

doi:10.1103/physrevb.88.075316

Cited by 11 publications

(10 citation statements)

References 48 publications

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“…4a), we associate this behavior with a partial removal of the inhomogeneous broadening when electron population over the subband is still not high enough. The inhomogeneous broadening is believed to arise from the structural fluctuations at the interfaces 2,47 appearing through the internal ("built-in") electric field (E b-in ) with a standard deviation of the Gaussian distribution, rather than from the quantum confinement induced variations 48 remaining ineffective since the size of NCs significantly exceeds the exciton Bohr radius (a few nm) 47 . Consequently, the homogeneously broadened features can be recognized ( Fig.…”

Section: Resultsmentioning

confidence: 99%

The emergence of perovskite solar cells

2014

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The dynamical and static Rashba effects in hybrid methylammonium (MA) lead halide perovskites have recently been theoretically predicted. However, only the static effect was experimentally confirmed so far. Here we report on the dynamical Rashba effect observed using snapshot transient absorption spectral imaging with 400 nm pumping for a fully encapsulated film of ~20-nm-sized 3D MAPbBr 3 nanocrystals. The effect causes a ~240 meV splitting of the lowest-energy absorption bleaching band, initially appearing over sub-ps timescale and progressively stabilizing to ~60 meV during ~500 ps. The integrated intensities of the split subbands demonstrate a photon-helicity-dependent asymmetry, thus proving the Rashba-type splitting and providing direct experimental evidence for the Rashba spin-split edge states in lead halide perovskite materials. The ultrafast dynamics is governed by the relaxation of two-photon-excited electrons in the Rashba spin-split system caused by a "built-in" electric field originating from dynamical charge separation in the entire MAPbBr 3 nanocrystal.

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Section: Resultsmentioning

confidence: 99%

The emergence of perovskite solar cells

2014

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“…2DFTS may be exploited to gain further insight into the influence of strain on the coherent optical response of semiconductors. For instance, the ability to independently measure the levels of homogeneous and inhomogeneous broadening [16][17][18][19][20][21] may yield insight into varying local electronic environments tied to partial strain relaxation in thin film systems. 2DFTS has also provided a wealth of information about many-body interactions (MBI) in quantum well systems through the ability to isolate a range of quantum pathways from the excitons, their coupling to one another, and biexcitons.…”

Section: Introductionmentioning

confidence: 99%

Role of strain on the coherent properties of GaAs excitons and biexcitons

et al. 2016

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Polarization-dependent two-dimensional Fourier-transform spectroscopy (2DFTS) is performed on excitons in strained bulk GaAs layers, probing the coherent response for differing amounts of strain. Biaxial tensile strain lifts the degeneracy of heavy-hole (HH) and light-hole (LH) valence states, leading to an observed splitting of the associated excitons at low temperature. Increasing the strain increases the magnitude of the HH/LH exciton peak splitting, induces an asymmetry in the off-diagonal interaction coherences, increases the difference in the HH and LH exciton homogenous linewidths, and increases the inhomogeneous broadening of both exciton species. All results arise from strain-induced variations in the local electronic environment, which is not uniform along the growth direction of the thin layers. For cross-linear polarized excitation, wherein excitonic signals give way to biexcitonic signals, the high-strain sample shows evidence of bound LH, HH, and mixed biexcitons.

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“…Process of working electrodes of dye senitised solar cell and its charge transfer were shown in Fig 3(a-c). However, spectral features may exhibit inhomogeneous broadening as a result of electronic confinement and can even yield information about a strain, as observed in bulk gallium arsenide (GaAs) [28]. Moreover, as a multi-pulse coherent-control scheme, 2DCS can also be used to examine non-radiative contributions (e.g., Raman or two-quantum coherence) by projecting these signals onto the emitted radiation.…”

Section: Different Types Of Dyes Used and Its Advantages Of Dye Sensi...mentioning

confidence: 99%

Oxide and metallic materials for photovoltaic applications: A Review

Nivetha

Ramasamy

Ayeshamariam³

et al. 2019

Theo. NANOTECHNOLOGY

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Materials and its properties are the main criteria to build its applications; some of the photovoltaic materials could be used in pure form to fabricate photovoltaic applications of the materials LCD (liquid crystal display), LED (Light emitting diodes), photodiodes and photo transistors. When it will be doped with oxide semiconducting materials its applications will be enhanced commercially. The resultant photovoltaic nanocomposites can be easily changed by its shape and parameters. The transparent conductor is applied to the touch screen panel and it is confirmed that all the final devices operate under continuous mechanical stress. This review gave the simple basic ideas of its development from 19 century to recent. The technologies of the photovoltaic applications and its electronic devices were dealt in this review. The unique optical properties of graphene were reported the use of solution processed high quality transparent conductive electrode in an organic solar cell. This review also deals with the reports of many researchers and their fabrications of thieno [3,4-b] thiophene/benzodithiophene: phenyl-C71-butyric acid methyl ester (PTB7:PCB71M) bulk heterojunction organic solar cell based on the exfoliated graphene (EG) anode exhibits a power conversion efficiency for next-generation flexible optoelectronic devices.

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Coherent coupling between exciton resonances governed by the disorder potential

Cited by 11 publications

References 48 publications

The emergence of perovskite solar cells

The emergence of perovskite solar cells

Role of strain on the coherent properties of GaAs excitons and biexcitons

Oxide and metallic materials for photovoltaic applications: A Review

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