Two-dimensional Wannier excitons in a layered-perovskite-type crystal (C6H13NH3)2PbI4

Tanaka, Kenichiro; Sano, Fumiaki; Takahashi, Takayuki; Kondo, Takashi; Ito, Ryoichi; Ema, Kazuhiro

doi:10.1016/s0038-1098(02)00126-6

Cited by 81 publications

(91 citation statements)

References 15 publications

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“…10 Its influence on the exciton Rydberg in semiconductor quantum wells was calculated by Hanamura et al 11 Ishihara et al 12,13 applied it to the inorganic-organic layered perovskites. A practical model to deal with excitons in the perovskite compounds, which includes not only the potential confinement but also the dielectric confinement effect, was proposed by Muljarov et al, 14 and the model has been further verified in detail by means of two-photon and the electroabsorption spectroscopies by Tanaka et al 15 By these efforts, it seems to be established that the excitons in two-dimensional perovskites are elucidated quite well as two-dimensional Wannier excitons, although their in-plane exciton Bohr radii are no more than several times as large as the unit cell. Hereafter in this paper, unless otherwise noted, we shall limit our discussion to the two-dimensional perovskites, which we call the inorganic-organic layered semiconductors.…”

Section: Introductionmentioning

confidence: 99%

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Influence of dielectric confinement on excitonic nonlinearity in inorganic-organic layered semiconductors

2005

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We have investigated photoinduced spectral changes of excitons in inorganic-organic layered semiconductors, ͑C 6 H 5 C 2 H 4 NH 3 ͒ 2 PbI 4 ͑PhE-PbI 4 ͒ and ͑C 6 H 13 NH 3 ͒ 2 PbI 4 ͑C6-PbI 4 ͒, by means of the subpicosecond pump-probe spectroscopy. The two semiconductors consist of the same inorganic layers and different organic layers. In the two substances, the blueshift and the bleaching of the exciton are observed. It is found that both of the blueshift and the bleaching are considerably stronger in C6-PbI 4 than in PhE-PbI 4 . The weight of the blueshift relative to the bleaching is larger in PhE-PbI 4 than in C6-PbI 4 . These differences are qualitatively explained in terms of the stronger dielectric confinement in C6-PbI 4 than in PhE-PbI 4 due to the lower dielectric constant of the organic layers in C6-PbI 4 than in PhE-PbI 4 . Delay time dependences of the blueshift and the bleaching and their polarization dependences are understood as being due to the exciton relaxation in the angular momentum space with rates of 2.7 and 4.1 ps −1 for PhE-PbI 4 and C6-PbI 4 , respectively.

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Section: Introductionmentioning

confidence: 99%

“…1. 15,30,31 Cross sections are perpendicular to the layers. In both substances, inorganic layers consist of ͓PbI 6 ͔ 4− octahedra which share four vertices one another.…”

Section: Introductionmentioning

confidence: 99%

Influence of dielectric confinement on excitonic nonlinearity in inorganic-organic layered semiconductors

2005

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“…The optical properties and electronic structures of a series of layered inorganic-organic lead iodide compounds have been studied in detail. [5][6][7][8][9][10][11][12][13][14][15][16] It is reported that both effects of those confinements on excitons lead to a very large binding energy of around 300 meV. In addition, biexcitons also have a large binding energy of ϳ40 meV.…”

Section: Introductionmentioning

confidence: 99%

Excitons and biexcitons bound to a positive ion in a bismuth-doped inorganic-organic layered lead iodide semiconductor

Fujisawa

Ishihara

2004

Phys. Rev. B

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We have studied optical properties of an inorganic-organic layered lead iodide semiconductor doped with bismuth ions ͑Bi 3+ ͒. A new absorption band was observed at 2.15 eV that is by 0.21 eV lower than twodimensional 1s excitons ͑2.36 eV͒ and is assigned to excitons bound to the bismuth ions. In the photoluminescence spectra with high excitation density ͑ϳ0.4 MW/ cm 2 ͒, a novel emission band was observed at the energy of 2.51 eV that is by 0.15 eV higher than the exciton resonance, and is attributed to biexcitons bound to the bismuth ions. On the basis of the experimental results, the binding energies of the bismuth-bound exciton and biexciton were estimated approximately as 210 and 10 meV, respectively. It is found that the binding energy of the positive-ion ͑Bi 3+ ͒ bound biexciton is by far smaller than that of the corresponding bound exciton. The much lower stability of the positive-ion bound biexciton is discussed.

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“…In this research area, an important aspect is dielectric confinement [1,2], the situation in which charge carriers are confined in low-dimensional structures surrounded by substances with a much lower dielectric constant. Large exciton binding energies in a series of inorganic-organic layered semiconductors have been reported as a manifestation of this effect [3][4][5].…”

Section: Introductionmentioning

confidence: 97%

Exciton–exciton interaction in an inorganic–organic layered semiconductor, (C6H5C2H4NH3)2PbI4

Shimizu

Fujisawa

2004

Journal of Luminescence

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Two-dimensional Wannier excitons in a layered-perovskite-type crystal (C6H13NH3)2PbI4

Cited by 81 publications

References 15 publications

Influence of dielectric confinement on excitonic nonlinearity in inorganic-organic layered semiconductors

Influence of dielectric confinement on excitonic nonlinearity in inorganic-organic layered semiconductors

Excitons and biexcitons bound to a positive ion in a bismuth-doped inorganic-organic layered lead iodide semiconductor

Exciton–exciton interaction in an inorganic–organic layered semiconductor, (C6H5C2H4NH3)2PbI4

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