Photoconductivity of Si/Ge buffers, superlattices, and multiple quantum wells

Menzel, D.; Koschinski, W.; Dettmer, K.; Schoenes, J.

doi:10.1016/s0040-6090(98)01481-3

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…For example, the study of photoconductivity of Si/Ge SL is of remarkable importance for photodiodes as emitter and receiver for fast optical communication [ 5 ]. In its applications like the space electronic component, the microelectronic component, the solar cell and the space-based electronics [ 1 , 4 , 6 ], the optical and electronic properties of Si/Ge SL may be altered due to the bombardment of high-energy ions from space environment, resulting in performance degradation of the electronic devices. Therefore, it is necessary to investigate the radiation responses of this semiconductor material under extreme working conditions.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Simulation of the Radiation Responses of Si, Ge, and Si/Ge Superlattice to Low-Energy Irradiation

et al. 2018

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In this study, the low-energy radiation responses of Si, Ge, and Si/Ge superlattice are investigated by an ab initio molecular dynamics method and the origins of their different radiation behaviors are explored. It is found that the radiation resistance of the Ge atoms that are around the interface of Si/Ge superlattice is comparable to bulk Ge, whereas the Si atoms around the interface are more difficult to be displaced than the bulk Si, showing enhanced radiation tolerance as compared with the bulk Si. The mechanisms for defect generation in the bulk and superlattice structures show somewhat different character, and the associated defects in the superlattice are more complex. Defect formation and migration calculations show that in the superlattice structure, the point defects are more difficult to form and the vacancies are less mobile. The enhanced radiation tolerance of the Si/Ge superlattice will benefit for its applications as electronic and optoelectronic devices under radiation environment.

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Section: Introductionmentioning

confidence: 99%

A Theoretical Simulation of the Radiation Responses of Si, Ge, and Si/Ge Superlattice to Low-Energy Irradiation

et al. 2018

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“…3, the thermal conductivity of (2,2) superlattice is higher than that of (2,4), (4,2), and (4,4) superlattices because of its shorter period, as expected. In the same period, the thermal conductivity of (2,4) superlattice is lower than that of (4,2) superlattice because of the higher 13 C concentration (lower group velocity), which is also expected. However, we found that even for the same superlattice period, the thermal conductivity of the superlattice does not decrease monotonically with increasing 13 C layers: Fig.…”

Section: Resultsmentioning

confidence: 79%

“…In recent decades, multilayer thin films, including superlattices, have been intensively studied in various fields, including electronics, 1,2) optics, 3) magnetics, 4) and acoustics. 5,6) The periodic structure in a superlattice produces unique physical properties, especially in electronics and optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

Lattice thermal conductivity in isotope diamond asymmetric superlattices

Weng¹,

Nagakubo²,

Watanabe³

et al. 2022

Jpn. J. Appl. Phys.

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We study lattice thermal conductivity of isotope diamond superlattices consisting of 12C and 13C diamond layers at various superlattice periods. It is found that the thermal conductivity of a superlattice is significantly deduced from that of pure diamond because of the reduction of the phonon group velocity near the folded Brillouin zone. The results show that asymmetric superlattices with different number of layers of 12C and 13C diamonds exhibit higher thermal conductivity than symmetric superlattices even with the same superlattice period, and we find that this can be explained by the trade-off between the effects of phonon specific heat and phonon group velocity. Furthermore, impurities and imperfect superlattice structures are also found to significantly reduce the thermal conductivity, suggesting that these effects can be exploited to control the thermal conductivity over a wide range.

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“…Recently, superlattices have been intensively studied because they exhibit special physical properties in various fields, especially electronics, optoelectronics, and magnetic fields. For instance, Si x /Ge 1−x and GaAs/Al x Ga 1−x As superlattices demonstrate the formation of a unique quantum well [1][2][3], and Fe/Cr superlattices show the giant magnetoresistance [4]. The thermal conduction of superlattices has been developed as a research area [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Phonon propagation in isotopic diamond superlattices

et al. 2021

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The out-of-plane thermal conductivity and elastic constant of epitaxial [100] 12 C/ 13 C superlattice diamonds with layer thicknesses of 1, 30, and 100 nm are evaluated by picosecond ultrasound spectroscopy. The measured elastic constants of the superlattices are equivalent to those of single-layer diamond thin films. This result confirms our success in synthesizing superlattice specimens with few defects at the interfaces. Therefore, the phonon transport behavior is governed by the mass difference, not the interfacial defects. The measured thermal conductivity of the superlattices is lower than that of a pure 12 C isotope diamond thin film. We estimated the lattice thermal conductivity using the lattice dynamics calculation, attributing the lowered thermal conductivity to the decrease in the phonon group velocity in superlattices. We further consider the effect of mini-umklapp scattering in the superlattice, which explains the dependence of the thermal conductivity on the layer thickness. We reveal that the mini-umklapp scattering effect becomes significant only for an isotope diamond superlattice because of the high Debye temperature and large relative mass difference.

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Photoconductivity of Si/Ge buffers, superlattices, and multiple quantum wells

Cited by 6 publications

References 12 publications

A Theoretical Simulation of the Radiation Responses of Si, Ge, and Si/Ge Superlattice to Low-Energy Irradiation

A Theoretical Simulation of the Radiation Responses of Si, Ge, and Si/Ge Superlattice to Low-Energy Irradiation

Lattice thermal conductivity in isotope diamond asymmetric superlattices

Phonon propagation in isotopic diamond superlattices

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