The ultimate target of molecular electronics is to combine different types of functional molecules into integrated circuits, preferably through an autonomous self-assembly process. Charge transport through self-assembled monolayers has been investigated previously, but problems remain with reliability, stability and yield, preventing further progress in the integration of discrete molecular junctions. Here we present a technology to simultaneously fabricate over 20,000 molecular junctions-each consisting of a gold bottom electrode, a self-assembled alkanethiol monolayer, a conducting polymer layer and a gold top electrode-on a single 150-mm wafer. Their integration is demonstrated in strings where up to 200 junctions are connected in series with a yield of unity. The statistical analysis on these molecular junctions, for which the processing parameters were varied and the influence on the junction resistance was measured, allows for the tentative interpretation that the perpendicular electrical transport through these monolayer junctions is factorized.
We report a low-temperature colloidal
synthesis of single-layer,
five-atom-thick, β-In2Se3 nanosheets with
lateral sizes tunable from ∼300 to ∼900 nm, using short
aminonitriles (dicyandiamide or cyanamide) as shape controlling agents.
The phase and the monolayer nature of the nanosheets were ascertained
by analyzing the intensity ratio between two diffraction peaks from
two-dimensional slabs of the various phases, determined by diffraction
simulations. These findings were further backed-up by comparing and
fitting the experimental X-ray diffraction pattern with Debye formula
simulated patterns and with side-view high-resolution transmission
electron microscopy imaging and simulation. The β-In2Se3 nanosheets were found to be indirect band gap semiconductors
(Eg = 1.55 eV), and single nanosheet photodetectors
demonstrated high photoresponsivity and fast response times.
In this work studies on photochromism for optics and photonics are reviewed. The versatility of organic chemistry gives photochromic materials wide opportunities for several applications that range from tunable filters and gratings, to refractive-index modulators for optical fibers and communications, to optical memories and sensors. Moreover, novel results on efficient modulation of amplified emission in a conjugated polymer/photochromic system are presented. Credit for the background image (WR 25 and Tr16-244, open cluster Trumpler 16): NASA, ESA and Jesús Maíz Apellániz
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