What is the bandgap of a bulk CdSe semiconductor?

At room temperature the band gap of CdSe is 1.74 eV. 6 In the two-color scheme, photon energy of pump pulse is 3.10 eV, well above the band gap and is able to excite free electrons and holes at the surface of bulk CdSe crystal.

Is CdS a quantum dot?

CdS quantum dot (QD) is a typical kind of II-IV nanoparticles, which plays an important role in the common type of core-shell QDs. It is of great practical significance to synthesize the water-soluble CdS QDs used in multicolor biomarkers and prepare core-shell QDs.

How does band gap energy of quantum dots vary with its size?

The bandgap energy of the quantum dot increases with the reduction of its size because of the quantum confinement.

Are quantum dots conductive?

Abstract. Graphene quantum dots (GQDs) as a novel conductive agent with nanometer-scale instead of the common carbon black (CB) offer a promising round to construct an effective conductive network for the improvement of the supercapacitors’ capacitive performance.

What are cadmium selenide quantum dots?

Overview. CdSe quantum dots (QDs) are produced by simultaneously injecting cadmium (Cd) and selenium (Se) precursor solutions into a heated growth solution of octadecene in ambient atmosphere. Once combined, Se and Cd form CdSe clusters that become continually growing QDs as the reaction progresses.

What is the potential V for a free particle?

In quantum mechanics, it means the particle is in a region of uniform potential, usually set to zero in the region of interest since the potential can be arbitrarily set to zero at any point in space.

Why does band gap increase with decrease in size?

The spacing of the electronic levels and the bandgap increases with decreasing particle size. This is because the electron hole pairs are now much closer together and the Coulombic interaction between them can no longer be neglected giving an overall higher kinetic energy.

What is quantum dot size?

Quantum dots are tiny particles or nanocrystals of a semiconducting material with diameters in the range of 2-10 nanometers (10-50 atoms). They were first discovered in 1980.

What type of semiconductor is CdSe?

II-VI semiconductor
Cadmium selenide is an inorganic compound with the formula CdSe. It is a black to red-black solid that is classified as a II-VI semiconductor of the n-type. Much of the current research on this compound is focused on its nanoparticles.