Enhanced multiple exciton generation in colloidal quantum dots

Photocatalytic hydrogen production by biomimetic indium sulfide using Mimosa pudica leaves as template (2019)
Journal Article

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.

The passivating effect of cadmium in PbS/CdS colloidal quantum dots probed by nm-scale depth profiling (2017)
Journal Article

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

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.

Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy (2016)
Journal Article

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

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

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

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.