On February 27th, 2020, China's Ministry of Science and Technology announced the top 10 scientific advances of 2019 in China.
Topping the list are the evidence of mantle material on the far side of the moon, a hybrid chip to stimulate artificial general intelligence and potential therapy for treating DNA-mediated autoimmune diseases.
Peking University and its collaborators’ research on extending the lifetime of perovskite solar cells was also among the list.
The research, carried out by Prof. Huanping Zhou ‘s team in the College of Engineering, Peking University, Prof. Chunhua Yan and Lingdong Sun’s team in the College of Chemistry and Molecular Engineering, Peking University, and other collaborators introduced Eu3+/Eu2+ ion pair redox shuttle into perovskite layer and achieved selectively oxidation of Pb0 and reduction of I0 defects simultaneously in a cyclical transition. The resultant perovskite solar cells achieved substantially improved efficiency and long-term durability.
Working mechanism of ion pair redox shuttle
This method provides a universal solution to the inevitable degradation issue of perovskite optoelectronic devices. This concept can also be extended to other inorganic semiconductor materials and devices which face similar instability problems.
Besides these, Chinese scientists have also achieved advances in studies on the light-harvesting system of algae, metallic glass for use in hot environments and the unveiling of the African swine fever virus structure.
The other key advances include a discovery of the earliest archaeological site on the Qinghai-Tibet Plateau, the first observation of 3D quantum Hall effect and using a quantum satellite to test quantum mechanics and the gravity theory.
The selection has three rounds. Five leading Chinese science academic journals first recommended 320 sets of research whose results were officially published from December 2018 to November 2019. The ministry then invited experts to shortlist 30 candidates for the final selection.
At last, more than 2,600 scientists from the Chinese Academy of Sciences, Chinese Academy of Engineering and other academic departments voted online for the top 10.
It is the ministry's 15th annual selection of China's top 10 advances in science.
---Source: Xinhua Net