Photon echo from free excitons in a 
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 halide perovskite single crystal

Nazarov, R. S.; Solovev, I. A.; Murzin, Aleksei O.; Selivanov, N. I.; Even, Jacky; Emeline, Alexei V.; Kapitonov, Yu. V.

doi:10.1103/physrevb.105.245202

Cited by 9 publications

(15 citation statements)

References 49 publications

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“…[ 45 ] The reflectivity spectrum presents an inflection point at 1.637 eV approximately in good agreement with previous reports. [ 26,46 ]…”

Section: Resultsmentioning

confidence: 99%

“…[45] The reflectivity spectrum presents an inflection point at 1.637 eV approximately in good agreement with previous reports. [26,46] It is now well established that excitons in CH 3 NH 3 PbI 3 have a low binding energy, estimated as approximately 15 meV in the low-temperature orthorhombic phase, and a few meV in the room temperature tetragonal phase. [47,48] While free carriers are predominantly generated upon photoexcitation at room temperature, we can expect excitons to be stable in the low-temperature phase.…”

Section: Excitation Power Dependence Of the Pl Spectramentioning

confidence: 99%

“…The free excitonic (FE) emission has been identified by some of us in the PL spectra of CH 3 NH 3 PbI 3 single crystals, [23] and in a few other studies. [24][25][26] However, in many cases, the low-temperature optical spectra of 3D HPs are characterized by the presence of several overlapping broad and featureless bands at energies below the FE emission. The low-energetic emission features have been assigned to various phenomena: bound excitons, [27] tetragonal phase inclusions, [28][29][30] donoracceptor pair (DAP) recombination, [31] molecularly disordered orthorhombic domains, [32] or band tail emission.…”

Section: Introductionmentioning

confidence: 99%

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Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals

Urban

Nguyen

Chehade

et al. 2023

Physica Rapid Research Ltrs

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Achieving a better understanding of the physics of defects in halide perovskites (HPs) is a key challenge for improving the efficiency of the devices. Herein, a comprehensive study of the defect emission of CH3NH3PbI3 perovskite single crystals is presented. The emission of the pristine surface of cleaved crystals is systematically investigated based on steady‐state and time‐resolved micro‐photoluminescence (micro‐PL) spectroscopy. Donor–acceptor pair (DAP) recombination is observed due to the presence of native shallow defects. The DAP spectra present an important variability depending on the location on the surface of the crystals due to inhomogeneous defect distribution. A strong blueshift of the emission is measured as a function of excitation power and is explained by fluctuating potential caused by compensated defects. With increasing photocarrier density, a transition from a structureless to a structured DAP emission with several longitudinal optical phonon replicas is observed. The DAP transition is characterized by the redshift of the emission with time and a slow, non‐exponential PL decay. Sharp discrete lines with sub‐meV widths, the most recognizable spectral signature of DAP transition, are revealed. Herein, the apparently contradictory previous observations on defect emission of CH3NH3PbI3 are reconciled by the results and new insights are provided into the properties of defects in HPs.

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“…[ 45 ] The reflectivity spectrum presents an inflection point at 1.637 eV approximately in good agreement with previous reports. [ 26,46 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Excitation Power Dependence Of the Pl Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals

Urban

Nguyen

Chehade

et al. 2023

Physica Rapid Research Ltrs

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“…19 These reports generated excitement about possible applications of perovskite semiconductors as bright quantum light sources (e.g., in quantum information processing), expanding the range of potential applications beyond photovoltaics and optoelectronics. So far, the coherence times in bulk perovskites were reported to be short (few picoseconds in MAPbI 3 15,20 ) as expected for free and weakly localized excitons.…”

mentioning

confidence: 86%

Long-Lived Exciton Coherence in Mixed-Halide Perovskite Crystals

Grisard,

Trifonov,

Solovev

et al. 2023

Nano Lett.

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Compositional engineering of the optical properties of hybrid organic− inorganic lead halide perovskites is crucial for the realization of efficient solar cells and light-emitting devices. We study the effect of band gap fluctuations on coherent exciton dynamics in a mixed FA 0.9 Cs 0.1 PbI 2.8 Br 0.2 perovskite crystal by using photon echo spectroscopy. We reveal a narrow homogeneous exciton line width of 16 μeV at a temperature of 1.5 K. The corresponding exciton coherence time T 2 = 83 ps is exceptionally long due to the localization of excitons at the scale of tens to hundreds of nanometers. From spectral and temperature dependences of the two-and three-pulse photon echo decay, we conclude that for low-energy excitons pure decoherence associated with elastic scattering on phonons is comparable with the exciton lifetime, while for excitons with higher energies, inelastic scattering to lower energy states via phonon emission dominates.

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“…[22] Photon echo has been observed in halide perovskites. [23][24][25] All of the above, as well as the simple liquid-phase synthesis and the ability to adjust the band gap in the entire visible range by anion substitution, make the family of halide perovskites proper for information photonics applications.…”

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confidence: 99%

Halide Perovskite Excitonic Diffraction Grating

Mamaeva

Lozhkin

Shurukhina

et al. 2022

Advanced Optical Materials

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Resonant diffractive optical elements can be used to create the desired spatial and angular distribution of scattered light in a narrow wavelength range. Exciton resonance could help to make such elements active. Here an exciton diffraction grating made from fully inorganic CsPbBr3 halide perovskite is demonstrated. Spatial modulation of excitonic properties of the single crystal is achieved using local defect formation by 30 keV Ga+ focused ion irradiation with low irradiation dose 1014 cm−2. Such a low dose prevents the appearance of non‐resonant diffraction since no sample milling occurs. The observed diffraction reflex has a maximum efficiency of 2.3 × 10−3 at the free exciton resonance and 1.7 meV spectral width. The temperature, angular, and spectral properties of resonant diffraction are studied. The possibility of creating exciton diffraction gratings based on halide perovskites is one more confirmation of their applicability as a new material for information photonics.

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Photon echo from free excitons in a CH3NH3PbI3 halide perovskite single crystal

Cited by 9 publications

References 49 publications

Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals

Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals

Long-Lived Exciton Coherence in Mixed-Halide Perovskite Crystals

Halide Perovskite Excitonic Diffraction Grating

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Photon echo from free excitons in a CH3NH3PbI3 halide perovskite single crystal

Cited by 9 publications

References 49 publications

Discrete Donor–Acceptor Pair Transitions in CH3NH3PbI3 Perovskite Single Crystals

Discrete Donor–Acceptor Pair Transitions in CH3NH3PbI3 Perovskite Single Crystals

Long-Lived Exciton Coherence in Mixed-Halide Perovskite Crystals

Halide Perovskite Excitonic Diffraction Grating

Contact Info

Product

Resources

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Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals

Discrete Donor–Acceptor Pair Transitions in CH₃NH₃PbI₃ Perovskite Single Crystals