Synthesis and characterization of PbSe quantum dots in phosphate glass

Lipovskii, A. A.; Колобкова, Е. В.; Petrikov, V. D.; Kang, Ilnam; Olkhovets, A.; Krauss, Todd; Thomas, M. G.; Silcox, J.; Wise, Frank W.; Shen, Qun; Kycia, S.

doi:10.1063/1.120349

Cited by 225 publications

(148 citation statements)

References 16 publications

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“…and Smith D.W., 1994;Cademartiri L. et al, 2006;Kane R.S. et al, 1996;Moreels I. et al, 2009) and b) PbSe (Dai Q. et al, 2009;Koole R. et al, 2008;Lipovskii A. et al, 1997;Liu Y. et al, 2010;Ma W. et al, 2011;Moreels I. et al, 2007;Pietryga J.M. et al, 2004;Sashchiuk A. et al, 2001;Steckel J.S.…”

Section: Application To Classificationmentioning

confidence: 99%

Analysis of Particle Size Distributions of Quantum Dots: From Theory to Application

Segets

2016

KONA

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Small, quantum-confined semiconductor nanoparticles, known as quantum dots (QDs) are highly important material systems due to their unique optoelectronic properties and their pronounced structure-property relationships. QD applications are seen in the emerging fields of thin films and solar cells. In this review, different characterization techniques for particle size distributions (PSDs) will be summarized with special emphasis on strategies developed and suggested in the past to derive data on the dispersity of a sample from optical absorbance spectra. The latter use the assumption of superimposed individual optical contributions according to the relative abundance of different sizes of a colloidal dispersion. In the second part, the high potential of detailed PSD analysis to get deeper insights of typical QD processes such as classification by size selective precipitation (SSP) will be demonstrated. This is expected to lead to an improved understanding of colloidal surface properties which is of major importance for the development of assumption-free interaction models.

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Section: Application To Classificationmentioning

confidence: 99%

Analysis of Particle Size Distributions of Quantum Dots: From Theory to Application

Segets

2016

KONA

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“…This is rather remarkable considering the small Bohr radius even for free holes (r h < 1 nm) in ZnO [30,45,46] given by…”

Section: Efficient Auger Charge-transfer Processes In Zno Phys Rev mentioning

confidence: 99%

Efficient Auger Charge-Transfer Processes in ZnO

et al. 2018

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Photoluminescence and magneto-optical measurements are performed on a line peaking at 3.354 eV (labeled as NBX) in electron-irradiated ZnO. Even though the energy position of the NBX line is close to that for bound excitons in ZnO, it has distinctively different magneto-optical properties. Photoelectron paramagnetic resonance measurements reveal a connection and a charge-transfer process involving NBX and Fe and Al centers. The experimental results are explained within a model which assumes that the NBX is a neutral donor bound exciton at a defect center located near a Fe impurity and an Auger-type chargetransfer process occurs between NBX and Fe 3þ . While the NBX dissociates, its hole is captured by an excited state of Fe 3þ and the released energy is transferred to the NBX electron, which is excited to the conduction band and subsequently trapped by a substitutional Al Zn shallow donor.

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“…This has led to the development of methods based on alternative precursors, including lead(II) chloride instead of PbO as the lead precursor to improve the surface passivation of the resulting CQDs [68,72], and elemental sulfur instead of (TMS) 2 S [73,74]. Additional novel growth methods have been proposed, including the synthesis of PbSe in a phosphate glass host [75]. The advantage of crystallizing QDs from the porous glass is that more homogeneous, larger crystal sizes exhibiting quantum confinement effects could be achieved versus those achieved in the conventional colloidal growth methods [76].…”

Section: Synthesis Methodsmentioning

confidence: 99%

Advancing colloidal quantum dot photovoltaic technology

et al. 2016

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Colloidal quantum dots (CQDs) are attractive materials for solar cells due to their low cost, ease of fabrication and spectral tunability. Progress in CQD photovoltaic technology over the past decade has resulted in power conversion efficiencies approaching 10%. In this review, we give an overview of this progress, and discuss limiting mechanisms and paths for future improvement in CQD solar cell technology. We briefly summarize nanoparticle synthesis and film processing methods and evaluate the optoelectronic properties of CQD films, including the crucial role that surface ligands play in materials performance. We give an overview of device architecture engineering in CQD solar cells. The compromise between carrier extraction and photon absorption in CQD photovoltaics is analyzed along with different strategies for overcoming this trade-off. We then focus on recent advances in absorption enhancement through innovative device design and the use of nanophotonics. Several light-trapping schemes, which have resulted in large increases in cell photocurrent, are described in detail. In particular, integrating plasmonic elements into CQD devices has emerged as a promising approach to enhance photon absorption through both near-field coupling and far-field scattering effects. We also discuss strategies for overcoming the single junction efficiency limits in CQD solar cells, including tandem architectures, multiple exciton generation and hybrid materials schemes. Finally, we offer a perspective on future directions for the field and the most promising paths for achieving higher device efficiencies.

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Synthesis and characterization of PbSe quantum dots in phosphate glass

Cited by 225 publications

References 16 publications

Analysis of Particle Size Distributions of Quantum Dots: From Theory to Application

Analysis of Particle Size Distributions of Quantum Dots: From Theory to Application

Efficient Auger Charge-Transfer Processes in ZnO

Advancing colloidal quantum dot photovoltaic technology

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