Stress Effects on <i>n</i>P Yellow Excitons in Cu<sub>2</sub>O Thin Films Recrystallized Epitaxially in a Sample Gap between Paired MgO Substrates

Iwamitsu, Kazunori; Aihara, Shingo; Ota, Akinobu; Ichikawa, Fusao; Shimamoto, Tadashi; Akai, Ichiro

doi:10.7566/jpsj.83.124714

Cited by 11 publications

(12 citation statements)

References 35 publications

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“…Such small difference of the lattice constants will permit the Cu 2 O (001) plane to grow epitaxially on the MgO (001) plane as reported in Ref. [5]. However, we found a different growth mode in our sample.…”

Section: Resultscontrasting

confidence: 34%

“…As described in our previous work [5], the lattice strain of the Cu 2 O relaxes along the thickness direction with departing from the boundary face between the MgO substrate and is completely released in the thickness region of ∼ 1.3 μm interfaced with the MgO substrate. Since the sample thickness (8.5 μm) is thicker than the strain remaining region and the absorption intensity of the exciting wavelength is weak, the PL of the 1S ortho excitons takes place by the photo-excitation in the whole thickness.…”

Section: Discussionmentioning

confidence: 87%

“…The Cu 2 O thin films were fabricated by a melting growth method [5]. Cu 2 O powder was sandwiched in a small gap between paired MgO plates and the sample was heated beyond the melting point temperature of Cu 2 O (1250°C) in a tube furnace with oxygen of 10 3 Pa. After melting of the powder, Cu 2 O percolates into the small gap and recrystallizes during cooling down.…”

Section: Methodsmentioning

confidence: 99%

“…However, the lattice mismatch induces stresses and forms an exciton trapping potential in the epitaxial layers in the Cu 2 O thin films. In our previous work [5], we measured wavelength modulated absorption spectra of a Cu 2 O thin film and studied stress effects of the band gap energy of the yellow exciton system from the energy shifts of the nP exciton transitions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Aihara

Ota

Iwamitsu

et al. 2015

Journal of Luminescence

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Section: Resultscontrasting

confidence: 34%

Section: Discussionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Aihara

Ota

Iwamitsu

et al. 2015

Journal of Luminescence

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“…On the other hand, we have prepared Cu 2 O thin‐crystals recrystallized epitaxially in a small gap between paired MgO substrates . In such thin‐crystals, we have considered that both sample‐thinning and formation of exciton‐trapping potential can be achieved at the same time.…”

Section: Introductionmentioning

confidence: 99%

Bayesian Spectroscopy on Polarization Dependent Photoluminescence Spectra of Doubly‐Split Excitons in a Cu₂O Thin‐Crystal Sandwiched by MgO Substrates

Kiridoshi

Aihara

Arishima

et al. 2018

Physica Status Solidi (b)

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By using Bayesian spectroscopy, we studied polarization dependence of photoluminescence (PL) spectra in doubly‐split 1S yellow ortho‐excitons in a Cu2O thin‐crystal recrystallized in a small gap between paired MgO substrates. In these thin‐crystals, biaxial stresses are expected to be involved due to a small lattice mismatch between Cu2O and MgO. Under a planar‐isotropic biaxial stress, the cubic symmetry degrades to the tetragonal one in Cu2O, and subsequently, the ortho‐exciton state splits into two states having different symmetries. Consequently, the resonant PL intensities of the doubly‐split ortho‐excitons are expected to show different polarization dependencies. To elucidate such biaxial stress effect, we measured polarization dependence of the PL spectra at 4.2 K. Although resonant weak PL bands of the doubly‐split exciton states and their intense phonon sidebands co‐exist, we succeeded in decomposing to the respective spectral components by the Bayesian spectroscopy with a replica exchange Monte Carlo algorithm. As a result, it is found that the resonant PL band appearing on higher energy side shows hardly polarization dependence, whereas the resonant PL band appearing on lower energy side is further weak and shows noticeable polarization dependence. These results can be explained by the selection rule and polarization dependences on the transition matrix elements of quadrupole transitions of the doubly‐split ortho‐exciton states, and it clearly shows that the crystal symmetry degrades to D4h by the isotropic biaxial stress involved in the Cu2O thin‐crystals.

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The effect of substrate temperature and oxygen partial pressure on the properties of nanocrystalline copper oxide thin films grown by pulsed laser deposition

Farhad

2021

Data in Brief

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The data presented in this paper are related to the research article entitled “Pulsed laser deposition of single phase n- and p-type Cu 2 O thin films with low resistivity” (S.F.U. Farhad et al., 2020) [1] . The detailed processing conditions of copper oxide thin films and a variety of characterization techniques used are described in the same ref. [1] https://doi.org/10.1016/j.matdes.2020.108848 . Thin films need to grow on different substrates to elucidate various properties of the individual layer for attaining optimum processing conditions required for devising efficient optoelectronic junctions as well as thin film stacks for different sensing applications. This article describes the effect of substrate temperature and oxygen partial pressure on the structural, morphological, optical, and electrical properties of pulsed laser deposited (PLD) nanocrystalline copper oxide thin films on quartz glass, ITO, NaCl(100), Si(100), ZnO coated FTO substrates. The low temperature grown copper oxide and zinc oxide thin films by PLD were used for devising solid n-ZnO/p-Cu 2 O junction and investigated their photovoltaic and interface properties using dynamic photo-transient current measurement at zero bias voltage and TEM/EDX respectively. These datasets are made publicly available for enabling extended analyses and as a guide for further research.

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Stress Effects on nP Yellow Excitons in Cu₂O Thin Films Recrystallized Epitaxially in a Sample Gap between Paired MgO Substrates

Cited by 11 publications

References 35 publications

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Bayesian Spectroscopy on Polarization Dependent Photoluminescence Spectra of Doubly‐Split Excitons in a Cu₂O Thin‐Crystal Sandwiched by MgO Substrates

The effect of substrate temperature and oxygen partial pressure on the properties of nanocrystalline copper oxide thin films grown by pulsed laser deposition

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Stress Effects on nP Yellow Excitons in Cu2O Thin Films Recrystallized Epitaxially in a Sample Gap between Paired MgO Substrates

Cited by 11 publications

References 35 publications

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu2O thin films recrystallized epitaxially between paired MgO plates

Bayesian Spectroscopy on Polarization Dependent Photoluminescence Spectra of Doubly‐Split Excitons in a Cu2O Thin‐Crystal Sandwiched by MgO Substrates

The effect of substrate temperature and oxygen partial pressure on the properties of nanocrystalline copper oxide thin films grown by pulsed laser deposition

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Product

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Stress Effects on nP Yellow Excitons in Cu₂O Thin Films Recrystallized Epitaxially in a Sample Gap between Paired MgO Substrates

Bayesian Spectroscopy on Polarization Dependent Photoluminescence Spectra of Doubly‐Split Excitons in a Cu₂O Thin‐Crystal Sandwiched by MgO Substrates