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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Ma, Zhenqiang
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Publications (5/5 displayed)
- 2024XPS analysis of molecular contamination and sp2 amorphous carbon on oxidized (100) diamondcitations
- 2024Characterization of AlGaAs/GeSn heterojunction band alignment via X-ray photoelectron spectroscopy
- 2023Monocrystalline Si/$β$-Ga$_2$O$_3$ p-n heterojunction diodes fabricated via graftingcitations
- 2023Demonstration of a monocrystalline GaAs-$β$-Ga$_2$O$_3$ p-n heterojunction
- 2023Band alignment of grafted monocrystalline Si (001)/$β$-Ga$_2$O$_3$ (010) p-n heterojunction determined by X-ray photoelectron spectroscopy
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document
Band alignment of grafted monocrystalline Si (001)/$β$-Ga$_2$O$_3$ (010) p-n heterojunction determined by X-ray photoelectron spectroscopy
Abstract
Beta-phase gallium oxide ($β$-Ga$_2$O$_3$) research has gained accelerated pace due to its superiorly large bandgap and commercial availability of large-diameter native substrates. However, the high acceptor activation energy obstructs the development of homojunction bipolar devices employing $β$-Ga$_2$O$_3$. The recently demonstrated semiconductor grafting technique provides an alternative and viable approach towards lattice-mismatched $β$-Ga$_2$O$_3$-based p-n heterojunctions with high quality interfaces. Understanding and quantitatively characterizing the band alignment of the grafted heterojunctions is crucial for future bipolar device development employing the grafting method. In this work, we present a systematic study of the band alignment in the grafted monocrystalline Si/$β$-Ga$_2$O$_3$ heterostructure by employing X-ray photoelectron spectroscopy (XPS). The core level peaks and valence band spectra of the Si, $β$-Ga$_2$O$_3$, and the grafted heterojunction were carefully obtained and analyzed. The band diagrams of the Si/$β$-Ga$_2$O$_3$ heterostructure were constructed using two individual methods, the core level peak method and the valence band spectrum method, by utilizing the different portions of the measured data. The reconstructed band alignments of the Si/$β$-Ga$_2$O$_3$ heterostructure using the two different methods are identical within the error range. The band alignment is also consistent with the prediction from the electron affinity values of Si and $β$-Ga$_2$O$_3$. The study suggests that the interface defect density in grafted Si/$β$-Ga$_2$O$_3$ heterostructure is at a sufficiently low level such that Fermi level pinning at the interface has been completely avoided and the universal electron affinity rule can be safely employed to construct the band diagrams of grafted monocrystalline Si/$β$-Ga$_2$O$_3$ heterostructures.