Contributed by Daniel Daniel
Quantum dot is a semiconductor crystal, which has electronic properties intermediate between those of bulk semiconductor and those of discrete molecules. The electronic properties of quantum dot are closely related to the size and shape of the individual crystal. Generally, the smaller the crystal, the larger the band gap and the larger is the energy transition between the highest valence band and the lowest conducting band. A main advantage of quantum dot is that because the size of the crystal can be exquisitely controlled, the electronic properties of quantum dots can similarly be tuned precisely.