Generation and control of spin-polarized photocurrents in GaMnAs heterostructures

Bezerra, Anibal Thiago; Castelano, L. K.; Degani, Marcos H.; Maialle, M. Z.; Farinas, Paulo F.; Studart, Nélson

doi:10.1063/1.4861656

Cited by 3 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent research has indicated that the generated photocurrents could also be spin-polarised. The application of a relatively small static field can affect the spin-polarisation for some photon energies (Bezerra et al, 2014). Further investigation of these effects is required.…”

Section: Humidity Effect or Static Electric Field Effectmentioning

confidence: 99%

Three-dimensional architectures composed of two-dimensional atomic layer molybdenum disulphide for solar cell and self-powered photodetectors with improved performance

Aldalbahi

Ahamad

Alshehri

et al. 2021

Energy Exploration & Exploitation

View full text Add to dashboard Cite

Research in the physical sciences is critical to the development of new materials technologies for clean energy. Aims in the present work are to synthesise and characterise three-dimensional architectures composed of two-dimensional atomic layer molybdenum disulphide for solar cells and self-powered photodetectors with improved performance. Nanostructured molybdenum disulphide was prepared by using a spin coating method with controlled process times. Prior to each deposition, the layer was dried with hot air for 5 min. A rough, irregular and clustered surface type was generated when the number of spin coating runs was increased. This type of surface was consistent with the morphologies expected for two-dimensional atomic layer molybdenum disulphide in three-dimensional architectures. The nanoscale morphologies, composites, and electronic properties of molybdenum disulphide were examined using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and micro-Raman scattering spectroscopy, respectively. Moreover, three-dimensional architecture-based prototypes for solar cells and self-powered photodetectors were designed, fabricated and tested. In photovoltaic mode, the obtained responsivity and response speed were almost 10 times larger and 20 times faster, respectively, than those recently reported for a single monolayer molybdenum disulphide-based self-powered prototype. In addition, the effects of bias, heat, humidity and a static field on the generated photocurrent and the response time were evaluated. It is expected that the newly designed prototype will exhibit exceptional properties: a broadband spectral response, a high signal-to-noise ratio and excellent stability.

show abstract

Section: Humidity Effect or Static Electric Field Effectmentioning

confidence: 99%

Three-dimensional architectures composed of two-dimensional atomic layer molybdenum disulphide for solar cell and self-powered photodetectors with improved performance

Aldalbahi

Ahamad

Alshehri

et al. 2021

Energy Exploration & Exploitation

View full text Add to dashboard Cite

show abstract

“…Because of the conservation of angular momentum, the circular dichroism can also be reflected by the polarization direction and the magnitude difference between the spin polarization carriers excited by left and right circularly polarized light. A further way to study magnetic properties of (Ga,Mn)As is to investigate the spin-polarized current or conductance9. Recently, spin-polarized photocurrents in DMS systems subjected to an external magnetic field induced by microwave or terahertz radiation have been observed, which is attributed to the giant Zeeman spin splitting or the spin-dependent carrier scattering10.…”

mentioning

confidence: 99%

“…Recently, spin-polarized photocurrents in DMS systems subjected to an external magnetic field induced by microwave or terahertz radiation have been observed, which is attributed to the giant Zeeman spin splitting or the spin-dependent carrier scattering10. So far almost all of the magnetic measurements, no matter the magnetic circular dichroism(MCD)111213 or the spin-related current910, need an external magnetic field, which causes the Zeeman splitting inevitably and may make the results conflicting.…”

mentioning

confidence: 99%

Observation of spin-polarized photoconductivity in (Ga,Mn)As/GaAs heterojunction without magnetic field

Liu

Wang

et al. 2017

Sci Rep

View full text Add to dashboard Cite

In the absent of magnetic field, we have observed the anisotropic spin polarization degree of photoconduction (SPD-PC) in (Ga,Mn)As/GaAs heterojunction. We think three kinds of mechanisms contribute to the magnetic related signal, (i) (Ga,Mn)As self-producing due to the valence band polarization, (ii) unequal intensity of left and right circularly polarized light reaching to GaAs layer to excite unequal spin polarized carriers in GaAs layer, and (iii) (Ga,Mn)As as the spin filter layer for spin transport from GaAs to (Ga,Mn)As. Different from the previous experiments, the influence coming from the Zeeman splitting induced by an external magnetic field can be avoided here. While temperature dependence experiment indicates that the SPD-PC is mixed with the magnetic uncorrelated signals, which may come from current induced spin polarization.

show abstract

Generation of spin polarized currents with coherent trapping in magnetic semiconductors

Pereira

Bezerra

Farinas

et al. 2017

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Generation and control of spin-polarized photocurrents in GaMnAs heterostructures

Abstract: Articles you may be interested inQuantum-level control in a III-V-based ferromagnetic-semiconductor heterostructure with a GaMnAs quantum well and double barriers Appl. Phys. Lett. 96, 052505 (2010);

Cited by 3 publications

References 32 publications

Three-dimensional architectures composed of two-dimensional atomic layer molybdenum disulphide for solar cell and self-powered photodetectors with improved performance

Three-dimensional architectures composed of two-dimensional atomic layer molybdenum disulphide for solar cell and self-powered photodetectors with improved performance

Observation of spin-polarized photoconductivity in (Ga,Mn)As/GaAs heterojunction without magnetic field

Generation of spin polarized currents with coherent trapping in magnetic semiconductors

Contact Info

Product

Resources

About