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2 results on '"dichalcogenide"'

1. Prolonged Lifetime in Nanocrystal Light-Emitting Diodes Incorporating MoS2-Based Conjugated Polyelectrolyte Interfacial Layer as an Alternative to PEDOT:PSS

Author

Alessandro Molle, Sergio Brovelli, Alessio Lamperti, Christian Martella, Francesco Carulli, Benoit Dubertret, Umberto Giovanella, Paola Lagonegro, Mariacecilia Pasini, Francesco Galeotti, Benedetta M. Squeo, Guido Scavia, Lagonegro, P, Martella, C, Squeo, B, Carulli, F, Scavia, G, Lamperti, A, Galeotti, F, Dubertret, B, Pasini, M, Brovelli, S, Molle, A, and Giovanella, U

Subjects
colloidal nanoplatelet, Materials science, business.industry, dichalcogenide, Conjugated Polyelectrolytes, Electronic, Optical and Magnetic Materials, law.invention, Colloid, PEDOT:PSS, Nanocrystal, interfacial layer, law, conjugated polyelectrolyte, Materials Chemistry, Electrochemistry, Optoelectronics, light-emitting device, Luminescence, business, Layer (electronics), Light-emitting diode, Diode
Abstract

Colloidal semiconductor nanocrystals (NCs) and, recently, nanoplatelets (NPLs), owing to their efficient and narrow-band luminescence, are considered as frontier materials for light-emitting diode (LED) technology. NC-LEDs typically incorporate interfacial layers as charge regulators to ensure charge balancing and high performance. In this Letter, we show the prolongation of the lifetime of multilayer solution-processed NC-LEDs by combining a self-doped conductive conjugated polyelectrolyte and exfoliated molybdenum disulfide (MoS2) flakes as an alternative to PEDOT:PSS. The ink features a neutral pH and a tunable hydrophobicity that mainly results in a remarkable stability of LEDs, using CdSe/CdZnS NPLs.

Published
2020
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2. Doping Nature of Native Defects in 1T-TiSe2

Author

Christoph Renner, Helmuth Berger, Clément Didiot, Gaël Monney, Alberto Ubaldini, Anna Maria Novello, B. Hildebrand, Philipp Aebi, Alessandro Scarfato, and David R. Bowler

Subjects
inorganic chemicals, Materials science, STM/STS, General Physics and Astronomy, FOS: Physical sciences, Nanotechnology, ddc:500.2, law.invention, Condensed Matter::Materials Science, Ab initio quantum chemistry methods, law, Electrical resistivity and conductivity, Condensed Matter::Superconductivity, Atom, Condensed Matter - Materials Science, Doping atoms, Dopant, Transition temperature, Doping, Materials Science (cond-mat.mtrl-sci), 3. Good health, Dichalcogenide, Chemical physics, Condensed Matter::Strongly Correlated Electrons, Scanning tunneling microscope, Charge density wave
Abstract

The transition metal dichalcogenide 1T-TiSe2 is a quasi two-dimensional layered material with a charge density wave (CDW) transition temperature of TCDW 200 K. Self-doping effects for crystals grown at different temperatures introduce structural defects, modify the temperature dependent resistivity and strongly perturbate the CDW phase. Here we study the structural and doping nature of such native defects combining scanning tunneling microscopy/spectroscopy and ab initio calculations. The dominant native single atom dopants we identify in our single crystals are intercalated Ti atoms, Se vacancies and Se substitutions by residual iodine and oxygen., Comment: 5 pages, 3 figures

Published
2014

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