Quantum dots are semiconductor nanocrystalline materials with a diameter of 2 to 10 nm (10 to 50 atoms).
The use of quantum dots instead of traditional semiconductor materials for high performance optoelectronic devices is a very important research direction.
In the synthesis of conventional colloidal quantum dots, a large number of organic ligands are often introduced.
However, the presence of organic ligands greatly hinders the efficiency of charge transport between quantum dots, so scientists have been developing new synthetic principles and methods.
A study published in Nature recently prepared a high-performance conductive chalcogenide quantum dot solid film by cleverly designing the chemical structure of surface organic ligands.
A collaboration between Nankai University and the University of Toronto, Canada, has discovered that by changing the structure of organic ligands, the transformation of physicochemical properties such as dimensional information, electronic energy band structure, and exciton effects can be effectively induced in chalcogenide materials.
Based on this, they developed a novel strategy for the in situ synthesis of high-quality conductive chalcogenide quantum dot solid films on the substrate surface.
This film has excellent optical and electrical properties and can be introduced into an electroluminescent diode device to form a tri-color electroluminescent diode with high energy conversion efficiency.
This work provides a new paradigm for the synthesis and application of chalcogenide quantum dots with high universality and precise controllability.