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Updated: Feb 15, 2026

Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Tunable mechanisms of quantum efficiencies in CdSe and TiO2 quantum dot solar cells
Abstract:
The absorption spectra of CdSe/ZnO and TiO2/MgZnO quantum dot (QD) solar cells were calculated, then their quantum efficiencies (QEs) were studied at different QD sizes and junction depths. Many mechanisms for tuning QE are examined. The first mechanism is doping the QD layer only, which is the case of CdSe, and it gives high QE. The second one is doping the bulk layer in addition to QDs, and it gives low QE but at a wide bandwidth, as in TiO2/MgZnO QD solar cells. Changing QD size is also another mechanism that can tune QE and its spectrum. The structures studied cover the range of 120-370 nm, which is important in photodetecting applications.
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The Dot Product
Dot Product
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...

