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Principles Of Fluorescence Spectroscopy

Measurements reveal the exciton binding energy, dielectric constant and refractive index of planar perovskite solar cells.

Electro-optics of perovskite solar cells

http://nathan.instras.com/documentDB/paper-69.pdf

Porous silicon: a quantum sponge structure for silicon based optoelectronics

A new chapter in the long and distinguished history of perovskites is being written with the breakthrough success of metal halide perovskites (MHPs) as solution-processed photovoltaic (PV) absorbers. The current surge in MHP research has largely arisen out of their rapid progress in PV devices; however, these materials are potentially suitable for a diverse array of optoelectronic applications. Like oxide perovskites, MHPs have ABX3 stoichiometry, where A and B are cations and X is a halide anion. Here, the underlying physical and photophysical properties of inorganic (A = inorganic) and hybrid organic–inorganic (A = organic) MHPs are reviewed with an eye toward their potential application in emerging optoelectronic technologies. Significant attention is given to the prototypical compound methylammonium lead iodide (CH3NH3PbI3) due to the preponderance of experimental and theoretical studies surrounding this material. We also discuss other salient MHP systems, including 2-dimensional compounds, where rele...

Intriguing Optoelectronic Properties of Metal Halide Perovskites

The application of nanotechnology concepts to medicine joins two large cross-disciplinary fields with an unprecedented societal and economical potential arising from the natural combination of specific achievements in the respective fields. The common basis evolves from the molecular-scale properties relevant to the two fields. Local probes and molecular imaging techniques allow surface and interface properties to be characterized on a nanometer scale at predefined locations, while chemical approaches offer the opportunity to elaborate and address surfaces, for example, for targeted drug delivery, enhanced biocompatibility, and neuroprosthetic purposes. However, concerns arise in this cross-disciplinary area about toxicological aspects and ethical implications. This Review gives an overview of selected recent developments and applications of nanomedicine.

Nanomedicine--challenge and perspectives.

1. Introduction 2. Experimental techniques of luminescence spectroscopy 3. Kinetic description of luminescence processes 4. Phonons and their participation in optical phenomena 5. Channels of radiative recombination in semiconductors 6. Nonradiative recombination 7. Luminescence of excitons 8. Highly excited semiconductors 9. Luminescence of disordered semiconductors 10. Stimulated emission 11. Electroluminescence 12. Electronic structure and luminescence of low-dimensional semiconductors 13. Effects of high excitation in low-dimensional structures 14. Stimulated emission and lasing in low-dimensional structures 15. Silicon nanophotonics 16. Photonic structures 17. Spectroscopy of single semiconductor nanocrystals

Luminescence Spectroscopy of Semiconductors

Carrier multiplication by generation of two or more electron-hole pairs following the absorption of a single photon may lead to improved photovoltaic efficiencies and has been observed in nanocrystals made from a variety of semiconductors, including silicon. However, with few exceptions, these reports have been based on indirect ultrafast techniques. Here, we present evidence of carrier multiplication in closely spaced silicon nanocrystals contained in a silicon dioxide matrix by measuring enhanced photoluminescence quantum yield. As the photon energy increases, the quantum yield is expected to remain constant, or to decrease as a result of new trapping and recombination channels being activated. Instead, we observe a step-like increase in quantum yield for larger photon energies that is characteristic of carrier multiplication. Modelling suggests that carrier multiplication is occurring with high efficiency and close to the energy conservation limit.

Step-like enhancement of luminescence quantum yield of silicon nanocrystals

Photoluminescence (PL) from single silicon quantum dots have been recorded and spectrally resolved at room temperature. The Si nanocrystals (NCs) were fabricated using electron-beam lithography and ...

/pdf/photoluminescence-spectroscopy-of-single-silicon-quantum-4uumr25ggl.pdf

Photoluminescence spectroscopy of single silicon quantum dots

Single-dot luminescence spectroscopy was used to study the emission linewidth of individual silicon nanocrystals from low temperatures up to room temperature. The results show a continuous line nar ...

/pdf/narrow-luminescence-linewidth-of-a-silicon-quantum-dot-tjrvs6jh8g.pdf

Narrow luminescence linewidth of a silicon quantum dot.

Silicon nanocrystals are an extensively studied light-emitting material due to their inherent biocompatibility and compatibility with silicon-based technology. Although they might seem to fall behind their rival, namely, direct band gap based semiconductor nanocrystals, when it comes to the emission of light, room for improvement still lies in the exploitation of various surface passivations. In this paper, we report on an original way, taking place at room temperature and ambient pressure, to replace the silicon oxide shell of luminescent Si nanocrystals with capping involving organic residues. The modification of surface passivation is evidenced by both Fourier transform infrared spectroscopy and nuclear magnetic resonance measurements. In addition, single-nanocrystal spectroscopy reveals the occurrence of a systematic fine structure in the emission single spectra, which is connected with an intrinsic property of small nanocrystals since a very similar structure has recently been observed in specially p...

Jan Valenta

Papers

Luminescence Spectroscopy of Semiconductors

Step-like enhancement of luminescence quantum yield of silicon nanocrystals

Photoluminescence spectroscopy of single silicon quantum dots

Narrow luminescence linewidth of a silicon quantum dot.

Brightly luminescent organically capped silicon nanocrystals fabricated at room temperature and atmospheric pressure.