Two‐photon absorption and magnetoabsorption of P excitons in β‐ZnP<sub>2</sub>

Engbring, J.; Fröhlich, D.; Schepe, R.; Spitzer, S.; Arimoto, Osamu; Nakamura, Katsumi

doi:10.1002/pssb.2221960222

Cited by 13 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its discrepancy with the effective masses obtained in Ref. 17 has no explanation at the moment. That is why for estimates of binding energies of excited states we will proceed from the experimental value of the binding energy of the ground state.…”

Section: Giant Two-photon Absorptioncontrasting

confidence: 74%

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

et al. 2001

View full text Add to dashboard Cite

Excited states of excitonic molecules have been observed by the direct method of giant two-photon absorption in a monoclinic ZnP 2 single crystal. Their origin and comparison with theoretical expectations are discussed. Photoluminescence of thermalized and nonthermalized ''cold'' excitonic molecules was studied under resonant two-photon excitation into their ground and excited states. An alternative mechanism of inelastic scattering of excitonic molecules is suggested.

show abstract

Section: Giant Two-photon Absorptioncontrasting

confidence: 74%

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

et al. 2001

View full text Add to dashboard Cite

show abstract

“…It expands the traditional Shockley-Queisser (SQ) limit to capture underpinning mechanisms that show relevance to realtime applications. Spin-orbit coupling (almost negligible experimental value [49]) and excitonic effects have not been included in this work.…”

Section: Computational Detailsmentioning

confidence: 99%

First-principles DFT insights into the structural, elastic, and optoelectronic properties ofαandβ-ZnP₂: implications for photovoltaic applications

Živković

Farkaš

Uahengo

et al. 2019

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Binary II-V semiconductors are highly optically active materials, possess high intrinsic mechanical and chemical durability, and have electronic properties ideal for optoelectronic applications. Among them, zinc diphosphide (ZnP 2) is a promising earth-abundant absorber material for solar energy conversion. We have investigated the structural, mechanical, and optoelectronic properties of both the tetragonal (α) and monoclinic (β) phases of ZnP 2 using standard, Hubbard-corrected and screened hybrid density functional theory methods. Through the analysis of bond character, band gap nature, and absorption spectra, we show that there exist two polymorphs of the β phase (denoted as β 1 and β 2) with distinct differences in the photovoltaic potential. While β 1 exhibits the characteristics of metallic compounds, β 2 is a semiconductor with predicted thin-film photovoltaic absorbing efficiency of almost 10%. The α phase is anticipated to be an indirect gap material with a calculated efficiency limited to only 1%. We have also analysed and gained insights into the electron localization function, projected density of states and projected crystal orbital Hamilton populations for the analogue bonds between the α and β-ZnP 2. In light of these calculations, a number of previous discrepancies have been solved and a solid ground for future employment of zinc diphosphides in photovoltaics has been established.

show abstract

“…The large exciton binding energy leads to the lowest exciton state well isolated from higher exciton states. We have so far investigated exciton relaxation processes in -ZnP 2 by means of resonant secondary emission, [10][11][12][13][14][15] two-photon absorption, 16,17) time-resolved luminescence, 18) and so on. 19,20) Compared to the III-V compounds, such as GaAs/AlAs quantum wells, with small exciton binding energy and exciton L-T splitting energy, -ZnP 2 is considered as one of the most promising candidates for a detailed investigation of coherent dynamics in exciton or exciton polariton systems.…”

mentioning

confidence: 99%

Ultrafast Quantum Beats and Optical Dephasing of Exciton Systems in β-ZnP₂by Spectrally Resolved Four-Wave Mixing

et al. 2003

View full text Add to dashboard Cite

We have performed spectrally resolved degenerate four-wave mixing (FWM) spectroscopy on exciton systems in -ZnP 2 using a femtosecond laser. The FWM signal clearly exhibits a periodic ultrafast modulation as a function of the delay time between two excitation pulses, which indicates the quantum beats due to the interference of two closely spaced transitions. From FWM and reflection spectra, the transitions are assigned to the 1s free exciton and the bound exciton. Dephasing times of the 1s exciton polariton are measured at various energies between the longitudinal and transverse excitons. The dephasing time is found to be longer as the polariton energy is lower, which suggests that the scatterings by acoustic phonons mainly govern the polariton dephasing. The difference in the modulation behavior of the quantum beats for the free and bound excitons is briefly discussed based on a simple model with a three-level system.

show abstract

Two‐photon absorption and magnetoabsorption of P excitons in β‐ZnP₂

Cited by 13 publications

References 16 publications

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

First-principles DFT insights into the structural, elastic, and optoelectronic properties ofαandβ-ZnP₂: implications for photovoltaic applications

Ultrafast Quantum Beats and Optical Dephasing of Exciton Systems in β-ZnP₂by Spectrally Resolved Four-Wave Mixing

Contact Info

Product

Resources

About

Two‐photon absorption and magnetoabsorption of P excitons in β‐ZnP2

Cited by 13 publications

References 16 publications

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

First-principles DFT insights into the structural, elastic, and optoelectronic properties ofαandβ-ZnP2: implications for photovoltaic applications

Ultrafast Quantum Beats and Optical Dephasing of Exciton Systems in β-ZnP2by Spectrally Resolved Four-Wave Mixing

Contact Info

Product

Resources

About

Two‐photon absorption and magnetoabsorption of P excitons in β‐ZnP₂

First-principles DFT insights into the structural, elastic, and optoelectronic properties ofαandβ-ZnP₂: implications for photovoltaic applications

Ultrafast Quantum Beats and Optical Dephasing of Exciton Systems in β-ZnP₂by Spectrally Resolved Four-Wave Mixing