Armin Barthel's research while affiliated with University of Cambridge and other places
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Publications (8)
Ultra-thin solar cells are of significant interest for use in space due to their intrinsic radiation tolerance, which may allow them to be used in particularly harsh radiation environments, where thicker cells would degrade rapidly and enable reduction in cover glass thickness to reduce launch mass. In this study, devices with an 80 nm GaAs absorbe...
The suitability of Ti as a band gap modifier for α-Ga2O3 was investigated, taking advantage of the isostructural α phases and high band gap difference between Ti2O3 and Ga2O3. Films of (Ti,Ga)2O3 were synthesized by atomic layer deposition on sapphire substrates, and characterized to determine how crystallinity and band gap vary with composition fo...
The suitability of Ti as a band gap modifier for $\alpha$-Ga$_2$O$_3$ was investigated, taking advantage of the isostructural {\alpha}-phases and high band gap difference between Ti$_2$O$_3$ and Ga$_2$O$_3$. Films of Ti:Ga$_2$O$_3$, with a range of Ti concentrations, synthesized by atomic layer deposition on sapphire substrates, were characterized...
Plasma‐enhanced atomic layer deposition was used to grow non‐stoichiometric nickel oxide thin films with low impurity content, high crystalline quality, and p‐type conductivity. Despite the non‐stoichiometry, the films retained the antiferromagnetic property of NiO.
Linked dataset: https://doi.org/10.17863/CAM.46487
Citations
... This phenomenon, called the Franz-Keldysh effect, is caused by spatial asymmetry in the electron-hole wavefunction near the band edge due to the electrostatic potential caused by the internal electric field [24,25]. The optical absorption coefficient for energies below the band-edge energy (φ CV ) decreases exponentially as the energy decreases [26][27][28]. Fig. 5(b) shows the EQE on a logarithmic scale in the range of near-infrared wavelengths. The EQE spectrum of the FP QDSC exhibits multiple peaks due to the FP resonances in this device. ...
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... The high radiation flux results in high degradation rates of the satellite's photovoltaic power supply, cutting down on the mission lifetime and driving up costs. 5,15 However, MEO have a lot of potential, 13,16,17 and will become more lucrative as low Earth orbit becomes cluttered. [18][19][20] It is, therefore, necessary to develop space photovoltaics with greater radiation tolerance that can extend mission lifetimes in MEO. ...
... Additionally, α-Ga 2 O 3 can readily integrate with other metal oxides possessing a corundum structure, such as Fe 2 O 3 , Al 2 O 3 , In 2 O 3 , V 2 O 3 , Rh 2 O 3 , Cr 2 O 3 , and Ti 2 O 3 . This provides a broad range of potential applications in solar-blind photodetectors and high-power electronic devices [13][14][15][16]. ...
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... It is well described in the literature that the diameter of the obtained semicircles is associated with the charge transfer resistance (R ct ) of the studied material in a certain electrolyte [58,59]. The result for carbon cloth shows an ascending curve, with a projected huge R ct value, while as the deposition time of the Ni increases, consequently adding more Ni to the system, there is a significant decrease in the value of the semicircle diameter, indicating a material considerably much less resistive (NiNP/CC 60s < NiNP/CC 40s < NiNP/CC 20s) [60]. ...
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