Quantum dots are semiconductor nanocrystals whose particle size is smaller than the Bohr radius of this material. Due to the unique physical, chemical and luminous properties, quantum dots have attracted much attention. Among them, core type quantum dots are heterogeneous nanocrystals composed of two or more semiconductor materials. On the one hand, core type quantum dots can effectively eliminate the anionic and cationic defects on the surface of mononuclear quantum dots, reducing the non-radiative transition and improving the luminescence performance. On the other hand, the core type quantum dots composed by semiconductor nanocrystals with different properties generally will have new functions. Therefore, in recent years, core type quantum dots have become a research hotspot.
Figure 1. An example of core type quantum dots applied in solar cells.
According to the arrangement mode, core type quantum dots can be divided into Type-I, Invert Type I and Type-II core type quantum dots.
Figure 2. An example of Type-I core type quantum dots.
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