New progress in the research of quantum cells in the Chinese Academy of Sciences

Recently, a new type of thin-film solar cell key laboratory of the Chinese Academy of Sciences has developed a new method for the preparation of quantum dots in quantum dot sensitized solar cells. The quantum dot prepared by the method is in direct contact with the surface of the nanocrystalline oxide and has a high coverage on the surface of the titanium dioxide.

With the support of the National 973 Major Scientific Problems-oriented Project, relevant researchers of the New Thin Film Solar Cell Key Laboratory of the Chinese Academy of Sciences conducted exploratory studies on new types of solar cells and structures such as quantum dot heterojunction solar cells and quantum dot-sensitized solar cells. the study. In the past year, the study of the charge transfer mechanism of cadmium sulfide/cadmium selenide QD sensitized solar cells was conducted, and the possibility of organometallic chelates acting as quantum dot sensitizer precursors was explored. Currently, studies are underway to develop a Cu2S counter electrode by the decomposition of molecular metal sulfide precursors in order to obtain better performance than commonly used platinum counter electrodes.

The new method uses metal chalcogenide (MCC) as a precursor. After MCC is adsorbed on the surface of TiO 2 nano-particles, the TiO 2 nano-film is subjected to mild heat treatment. The MCC is decomposed into quantum dots and adsorbed on the TiO 2 nanoparticles to form quantum dots. The photoanode (see the figure below), the prepared quantum dots and the nanocrystalline oxide surface are in direct contact with each other, and the coverage on the titanium dioxide surface is high.

The results of the study were published on the Chemical Communications of the British Chemical Society on February 24th.