Dr Marina Leontiadou's Outputs (20)

Publisher correction : Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells (2020)
Journal Article
Roble, A., Patra, S., Massabuau, F., Frentrup, M., Leontiadou, M., Dawson, P., …Schulz, S. (2020). Publisher correction : Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells. Scientific reports, 10(1), 5667. https://doi.org/10.1038/s41598-020-62494-x

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells (2019)
Journal Article
Leontiadou, M., Roble, A., Patra, S., Massabau, F., Fentrup, M., Dawson, P., …Schulz, S. (2019). Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells. Scientific reports, 9(1), 18862. https://doi.org/10.1038/s41598-019-53693-2

We report on a combined theoretical and experimental study of the impact of alloy fluctuations and Coulomb effects on the
electronic and optical properties of c-plane GaN/AlGaN multi-quantum well systems. The presence of carrier localization
effect... Read More about Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells.

Photocatalytic hydrogen production by biomimetic indium sulfide using Mimosa pudica leaves as template (2019)
Journal Article
Carrasco-Jaim, O., Ahumada-Lazo, R., Clark, P., Gómez-Solis, C., Fairclough, S., Haigh, S., …Flavell, W. (2019). Photocatalytic hydrogen production by biomimetic indium sulfide using Mimosa pudica leaves as template. International Journal of Hydrogen Energy, 44(5), 2770-2783. https://doi.org/10.1016/j.ijhydene.2018.12.043

Biomimetic sulfur-deficient indium sulfide (In2.77S4) was synthesized by a template-assisted hydrothermal method using leaves of Mimosa pudica as a template for the first time. The effect of this template in modifying the morphology of the semiconduc... Read More about Photocatalytic hydrogen production by biomimetic indium sulfide using Mimosa pudica leaves as template.

Charge dynamics in colloidal quantum dots : recombination, trapping and multiple exciton generation (2017)
Book Chapter
Leontiadou, M., Smith, C., Lydon, C., & Binks, D. (2017). Charge dynamics in colloidal quantum dots : recombination, trapping and multiple exciton generation. In P. Skabara, & M. Malik (Eds.), Nanostructured Materials for Type III Photovoltaics. Royal Society of Chemistry. https://doi.org/10.1039/9781782626749-00472

Colloidal quantum dots (CQDs) are semiconductor crystals, the nanometre-scale size of which both allows their absorption edge to be controlled during growth and enhances the yield of multiple exciton generation. These properties, combined with the fa... Read More about Charge dynamics in colloidal quantum dots : recombination, trapping and multiple exciton generation.

Ultrafast charge dynamics in dispersions of monolayer MoS2 nanosheets (2017)
Journal Article
Kime, G., Leontiadou, M., Brent, J., Savjani, N., O'Brien, P., & Binks, D. (2017). Ultrafast charge dynamics in dispersions of monolayer MoS2 nanosheets. Journal of Physical Chemistry C, 121, 22415-22421. https://doi.org/10.1021/acs.jpcc.7b05631

Ultrafast charge dynamics in dispersions of MoS2 nanosheets in N-methyl-2-pyrrolidone are reported. Samples were prepared by the ultrasonication-assisted exfoliation of MoS2 powder, resulting in nanosheets that were predominantly monolayer and had an... Read More about Ultrafast charge dynamics in dispersions of monolayer MoS2 nanosheets.

The passivating effect of cadmium in PbS/CdS colloidal quantum dots probed by nm-scale depth profiling (2017)
Journal Article
Clark, P., Radtke, H., Pengpad, A., Williamson, A., Spencer, B., Hardman, S., …Flavell, W. (2017). The passivating effect of cadmium in PbS/CdS colloidal quantum dots probed by nm-scale depth profiling. Nanoscale, 9(2017), 6056-6067. https://doi.org/10.1039/c7nr00672a

Achieving control of the surface chemistry of colloidal quantum dots (CQDs) is essential to fully exploit their properties in solar cells, but direct measurement of the chemistry and electronic structure in the outermost atomic layers is challenging.... Read More about The passivating effect of cadmium in PbS/CdS colloidal quantum dots probed by nm-scale depth profiling.

Multiple exciton generation and dynamics in InP/CdS colloidal quantum dots (2017)
Journal Article
Smith, C., Leontiadou, M., Clark, P., Lydon, C., Savjani, N., Spencer, B., …Binks, D. (2017). Multiple exciton generation and dynamics in InP/CdS colloidal quantum dots. Journal of Physical Chemistry C, 121(4), 2099-2107. https://doi.org/10.1021/acs.jpcc.6b11744

We report measurements of multiple exciton generation and recombination in InP/CdS (core/shell) colloidal quantum dots. Ultrafast transient absorption spectroscopy was used to measure the subnanosecond charge dynamics for a range of pump fluences and... Read More about Multiple exciton generation and dynamics in InP/CdS colloidal quantum dots.

Energy structure of CdSe/CdTe type II colloidal quantum dots—Do phonon bottlenecks remain for thick shells? (2016)
Journal Article
Smith, C., Tyrrell, E., Leontiadou, M., Miloszewski, J., Walsh, T., Cadirci, M., …Tomic, S. (2016). Energy structure of CdSe/CdTe type II colloidal quantum dots—Do phonon bottlenecks remain for thick shells?. Solar Energy Materials and Solar Cells, 158(2), 160-167. https://doi.org/10.1016/j.solmat.2015.12.015

The electronic structures of CdSe/CdTe type II colloidal quantum dots are predicted using a model based on k·pk·p theory and the many-particle configuration interaction method. The separation of energy levels in the conduction band is examined and us... Read More about Energy structure of CdSe/CdTe type II colloidal quantum dots—Do phonon bottlenecks remain for thick shells?.

Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy (2016)
Journal Article
Spencer, B., Leontiadou, M., Clark, P., Williamson, A., Silly, M., Sirotti, F., …Flavell, W. (2016). Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy. Applied Physics Letters, 108(9), 091603. https://doi.org/10.1063/1.4943077

Time-resolved laser-pump X-ray-photoemission-probe spectroscopy of a ZnO (101 ⎯ ⎯ 0
101¯0
) substrate with and without PbS quantum dots (QDs) chemically linked to the surface is performed, using laser photon energies resonant with and below the b... Read More about Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy.

Ultrafast exciton dynamics in CdxHg(1-x)Te alloy quantum dots (2016)
Journal Article
Leontiadou, M., Al-Otaify, A., Kershaw, S., Zhovtiuk, O., Kalytchuk, S., Mott, D., …Binks, D. (2016). Ultrafast exciton dynamics in CdxHg(1-x)Te alloy quantum dots. Chemical Physics, 469-70(May 16), 25-30. https://doi.org/10.1016/j.chemphys.2016.02.003

Ultrafast transient absorption spectroscopy is used to investigate sub-nanosecond exciton dynamics in CdxHg(1−x)Te alloy colloidal quantum dots. A bleach was observed at the band gap due to state-filling, the mono-exponential decay of which had a cha... Read More about Ultrafast exciton dynamics in CdxHg(1-x)Te alloy quantum dots.

Influence of elevated radiative lifetime on efficiency of CdSe/CdTe Type II colloidal quantum dot based solar cells (2016)
Journal Article
Leontiadou, M., Tyrrell, E., Smith, C., Espinbarro-Velasquez, D., Miloszewski, J., Walsh, T., …Tomic, S. (2016). Influence of elevated radiative lifetime on efficiency of CdSe/CdTe Type II colloidal quantum dot based solar cells. Solar Energy Materials and Solar Cells, 159, 657-663. https://doi.org/10.1016/j.solmat.2016.01.018

Colloidal quantum dots (CQDs) are promising materials for solar cells because their optoelectronic properties are easily adjusted by control of their size, structure and composition. We present calculations of the band gap and radiative lifetime for... Read More about Influence of elevated radiative lifetime on efficiency of CdSe/CdTe Type II colloidal quantum dot based solar cells.

Gain spectroscopy of solution-based semiconductor nanocrystals in tunable optical microcavities (2015)
Journal Article
Patel, R., Trichet, A., Coles, D., Dolan, P., Fairclough, S., Leontiadou, M., …Smith, J. (2015). Gain spectroscopy of solution-based semiconductor nanocrystals in tunable optical microcavities. Advanced optical materials, 4(2), 285-290. https://doi.org/10.1002/adom.201500363

The lasing behavior of solution‐based colloidal quantum dots within an open microcavity is reported. The small size and wide tunability of the cavity provide single mode lasing over a wavelength range in excess of 25 nm. By extracting the lasing thre... Read More about Gain spectroscopy of solution-based semiconductor nanocrystals in tunable optical microcavities.

Ultrafast charge dynamics in trap-free and surface-trapping colloidal quantum dots (2015)
Journal Article
Smith, C., Leontiadou, M., Page, R., O'Brien, P., & Binks, D. (2015). Ultrafast charge dynamics in trap-free and surface-trapping colloidal quantum dots. Advanced Science, 2(10), 1500088. https://doi.org/10.1002/advs.201600165

Ultrafast transient absorption spectroscopy is used to study subnanosecond charge dynamics in CdTe colloidal quantum dots. After treatment with chloride ions, these can become free of surface traps that produce nonradiative recombination. A compariso... Read More about Ultrafast charge dynamics in trap-free and surface-trapping colloidal quantum dots.

Effect of chloride passivation on recombination dynamics in CdTe colloidal quantum dots (2015)
Journal Article
Espinobarro-Velazquez, D., Leontiadou, M., Page, R., Califano, M., O'Brien, P., & Binks, D. (2015). Effect of chloride passivation on recombination dynamics in CdTe colloidal quantum dots. ChemPhysChem, 16(6), 1239-1244. https://doi.org/10.1002/cphc.201402753

Colloidal quantum dots (CQDs) can be used in conjunction with organic charge‐transporting layers to produce light‐emitting diodes, solar cells and other devices. The efficacy of CQDs in these applications is reduced by the non‐radiative recombination... Read More about Effect of chloride passivation on recombination dynamics in CdTe colloidal quantum dots.

Near-unity quantum yields from chloride treated CdTe colloidal quantum dots (2014)
Journal Article
Page, R., Espinobarro-Velazquez, D., Leontiadou, M., Smith, C., Lewis, E., Haigh, S., …Binks, D. (2015). Near-unity quantum yields from chloride treated CdTe colloidal quantum dots. Small, 11(13), 1548-1554. https://doi.org/10.1002/smll.201402264

Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non‐radiative charge recombination that significantly reduces device performan... Read More about Near-unity quantum yields from chloride treated CdTe colloidal quantum dots.

Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres (2014)
Journal Article
Al-Otaify, A., Leontiadou, M., dos Reis, F., Damato, T., Camargo, P., & Binks, D. (2014). Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres. Physical Chemistry Chemical Physics, 16, 14189-14194. https://doi.org/10.1039/c4cp01475h

Sub-nanosecond charge dynamics in monodisperse Au nanoparticles (NPs) supported on TiO2 colloidal spheres are studied as a function of NP diameter using ultrafast transient absorption spectroscopy. The decay of the transmittance changes observed in t... Read More about Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres.

Substantial temperature dependence of transverse electron g*-factor in lead chalcogenide multi-quantum wells (2011)
Presentation / Conference
Leontiadou, M., Litvinenko, K., Clowes, S., Springholz, G., Schwarzl, T., Eibelhuber, M., …Murdin, B. (2011, August). Substantial temperature dependence of transverse electron g*-factor in lead chalcogenide multi-quantum wells. Presented at 15th International Conference on Narrow Gap Systems, Blacksburg, USA

We report significant temperature dependence of the transverse electron g*‐factor in symmetric lead chalcogenide multi‐quantum wells (MQWs). The g*‐factor values were extracted from the electron Larmor precessions recorded by means of a circularly po... Read More about Substantial temperature dependence of transverse electron g*-factor in lead chalcogenide multi-quantum wells.

Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures (2011)
Journal Article
Leontiadou, M., Litvinenko, K., Gilbertson, A., Pidgeon, C., Branford, W., Cohen, L., …Clowes, S. (2011). Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures. Journal of Physics: Condensed Matter, 23(3), https://doi.org/10.1088/0953-8984/23/3/035801

We report the optical measurement of the spin dynamics at elevated temperatures and in zero magnetic field for two types of degenerately doped n-InSb quantum wells (QWs), one asymmetric (sample A) and one symmetric (sample B) with regards to the elec... Read More about Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures.

Manipulation of spin dynamics in semiconductor structures by orientation of small external magnetic field (2010)
Presentation / Conference
Litvinenko, K., Leontiadou, M., Li, J., Bowyer, E., Clowes, S., Pidgeon, C., & Murdin, B. (2010, July). Manipulation of spin dynamics in semiconductor structures by orientation of small external magnetic field. Presented at 30th International Conference on the Physics of Semiconductors, Seoul, Korea

We have investigated the effect of an external magnetic field on the electron spin lifetime in narrow gap semiconductors (NGS). In zero field, we show that the D'yakonov‐Perel process dominates even at low temperatures. In the Faraday configuration i... Read More about Manipulation of spin dynamics in semiconductor structures by orientation of small external magnetic field.

Strong dependence of spin dynamics on the orientation of an external magnetic field for InSb and InAs (2010)
Journal Article
Litvinenko, K., Leontiadou, M., Li, J., Clowes, S., Emeny, M., Ashley, T., …Murdin, B. (2010). Strong dependence of spin dynamics on the orientation of an external magnetic field for InSb and InAs. Applied Physics Letters, 96(11), 111107. https://doi.org/10.1063/1.3337111

Electron spin relaxation times have been measured in InSb and InAs epilayers in a moderate (<4 T) external magnetic field. A strong and opposite field dependence of the spin lifetime was observed for longitudinal (Faraday) and transverse (Voigt) c... Read More about Strong dependence of spin dynamics on the orientation of an external magnetic field for InSb and InAs.