Giant photoresponse enhancement in Cr2O3 films by Ni doping-induced insulator-to-semiconductor transition

Fan, Zihao; Zhu, Min; Pan, Shusheng; Ge, Juan; Hu, Ling

doi:10.1016/j.ceramint.2021.01.226

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…Ti contacts to α-Cr 2 O 3 and α-Ga 2 O 3 films were Ohmic in nature and were found to be stable within the range of T = 300−673 K. It was established that α-Ga 2 O 3 films are characterized by extremely low values of dark current density J D at room temperature and fine photoelectrical parameters J ph , J ph /J D , R * , D * , and EQE (see the table), which are comparable or superior to the results reported in other studies [1,[4][5][6][7]14]. Rise τ 1 and fall τ 2 photoresponse times determined at the levels of 0.9J L (J L is the net electric current in a film under UV irradiation) and 1.1J D , respectively, were 0.1 and ∼ 60 s for α-Ga 2 O 3 films.…”

supporting

confidence: 73%

“…The lattice mismatch of α-Ga 2 O 3 and α-Cr 2 O 3 does not exceed 1%. This semiconductor with E g = 2.9−3.4 eV features intrinsic hole conductivity and is being studied extensively for the purpose of development of transparent conductive oxides, gas sensors, and photodetectors [12][13][14]. α-Ga 2 O 3 /α-Cr 2 O 3 structures may hold promise for the design of power devices and photodiodes.…”

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confidence: 99%

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Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Almaev

A.V.

Kopyev

et al. 2022

Technical Physics Letters

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α-Ga2O3/α-Cr2O3 heterostructures with a corundum structure were obtained by chloride vapor phase epitaxy and magnetron sputtering. The structural, electrical conductive and photoelectrical properties of the obtained samples were studied. It was established that the α-Ga2O3/α-Cr2O3 heterostructures exhibits weak rectifying properties and in comparison with α-Ga2O3 films has a higher response speed when exposed to ultraviolet radiation Keywords: Gallium oxide, chromium oxide, corundum, anisotypic heterostructures

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confidence: 73%

mentioning

confidence: 99%

Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Almaev

A.V.

Kopyev

et al. 2022

Technical Physics Letters

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“…Under such conditions, photocurrent was generated and then amplified under external circuits' voltage. [44] Figure 6 reports the responsivity and photocurrent of the samples as a function of wavelength at the bias of 5 V. The wavelength ranges from 500 to 1100 nm. As the wavelength increases, the responsivity initially increases slightly and reaches its peak value at the wavelength of %800 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Under such conditions, photocurrent was generated and then amplified under external circuits’ voltage. [ 44 ]…”

Section: Resultsmentioning

confidence: 99%

Visible and Infrared Photoresponse in (V_0.99Cr_0.01)₂O₃ Epitaxial Films

Fan

Zhao

et al. 2022

Physica Status Solidi (a)

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Herein, an infrared (IR) photodetector has been demonstrated by depositing the (V0.99Cr0.01)2O3 films on top of a sapphire (Al2O3) wafer. The photoresponse properties, including photocurrent, voltage, responsivity, and response speed, at different temperatures and wavelengths are explored. The results showed that the deposited samples produce a significant photoresponse in the near‐IR (NIR) light. In particular, as temperature increases from 298 K (25 °C) to 453 K (180 °C), the responsivity of (V0.99Cr0.01)2O3 films improves from 7.4 to 49.4 mA W−1 under 5 V biased 940 nm laser irradiation, and it holds the quick response for about 5 s. The findings indicate that (V0.99Cr0.01)2O3 film is a promising candidate material for IR photodetector and temperature‐dependent optical delay triggers.

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“…The advantage of these materials is that they are low cost, can be made from cheap and abundant materials, and are also easily reusable. In addition to their role in corrosion protection, their properties are of interest for various applications [4][5][6][7][8][9][10][11][12][13][14][15] such as electronic components, solar cells, or photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Oxides Film Formed on Fe- and Ni-Based Alloys: An Ellipsometry Insight

et al. 2023

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UV-visible spectroscopic ellipsometry was used to study the thickness and composition of the oxidized zone in Fe- and Ni-based alloys as a function of oxygen partial pressure. In the case of AISI 304 stainless steel, the weathered thickness increases with oxygen partial pressure, whereas in the case of Inconel 600, it appears to be independent of oxygen pressure. This trend is confirmed by the AFM measurements. For both materials studied, the oxygen-modified zone consists of two layers as confirmed by glow discharge optical emission spectrometry (GDOES) measurements. The thicknesses of these two layers vary differently on either side of an oxygen partial pressure of 0.1 Torr. In the case of AISI 304 stainless steel, the thickness of the Fe-rich outer layer decreases in favor of the Cr-rich inner layer. In the case of Inconel 600, the trend is reversed. The Ni-rich outer layer increases significantly above this critical pressure, while the Cr-rich inner layer decreases slightly. The composition of each layer in the oxidized zone is discussed in terms of its dielectric function in relation to reference material. The use of UV-visible ellipsometry as a non-destructive tool to study the structure and composition of the oxide bilayer of absorbing systems such as the alloys under investigation is a first.

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Giant photoresponse enhancement in Cr2O3 films by Ni doping-induced insulator-to-semiconductor transition

Cited by 14 publications

References 28 publications

Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Visible and Infrared Photoresponse in (V_0.99Cr_0.01)₂O₃ Epitaxial Films

Oxides Film Formed on Fe- and Ni-Based Alloys: An Ellipsometry Insight

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Giant photoresponse enhancement in Cr2O3 films by Ni doping-induced insulator-to-semiconductor transition

Cited by 14 publications

References 28 publications

Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Electrical conductive and photoelectrical properties of heterostructures based on gallium and chromium oxides with corundum structure

Visible and Infrared Photoresponse in (V0.99Cr0.01)2O3 Epitaxial Films

Oxides Film Formed on Fe- and Ni-Based Alloys: An Ellipsometry Insight

Contact Info

Product

Resources

About

Visible and Infrared Photoresponse in (V_0.99Cr_0.01)₂O₃ Epitaxial Films