268 research outputs found
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Semiconductor devices and methods
A method of forming a semiconductor device includes the following steps: providing a plurality of semiconductor layers; providing means for coupling signals to and/or from layers of the device; providing a quantum well disposed between adjacent layers of the device; and providing a layer of quantum dots disposed in one of the adjacent layers, and spaced from the quantum well, whereby carriers can tunnel in either direction between the quantum well and the quantum dots.Board of Regents, University of Texas Syste
Recommended from our members
Semiconductor devices and methods
A method of forming a semiconductor device includes the following steps: providing a plurality of semiconductor layers; providing means for coupling signals to and/or from layers of the device; providing a quantum well disposed between adjacent layers of the device; and providing a layer of quantum dots disposed in one of the adjacent layers, and spaced from the quantum well, whereby carriers can tunnel in either direction between the quantum well and the quantum dots.Board of Regents, University of Texas Syste
An elastic model for the In-In correlations in In(x)Ga(1-x)As semiconductor alloys
Deviations from randomicity in In(x)Ga(1-x) As semiconductor alloys induced
by elastic effects are investigated within the Keating potential. Our model is
based on Monte Carlo simulations on large (4096 atoms) supercells, performed
with two types of boundary conditions: Fully periodic boundary conditions
represent the bulk, while periodic boundary conditions along the x and y
directions and a free surface in the z direction simulate the epitaxial growth
environment. We show that In-In correlations identified in the bulk tend to be
enhanced in the epitaxially grown samples.Comment: 13 pages, 1 figure, published in Solid State Communication
Absorbance based light emitting diode optical sensors and sensing devices
The ever increasing demand for in situ monitoring of health, environment and security has created a need for reliable, miniaturised sensing devices. To achieve this,
appropriate analytical devices are required that possess operating characteristics of reliability, low power consumption, low cost, autonomous operation capability and
compatibility with wireless communications systems. The use of light emitting diodes (LEDs) as light sources is one strategy, which has been successfully applied in chemical
sensing. This paper summarises the development and advancement of LED based chemical sensors and sensing devices in terms of their configuration and application, with the focus on transmittance and reflectance absorptiometric measurements
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