Researchers from North Carolina State University and the Chinese Academy of Sciences have jointly found a convenient way to change the molecular structure applied to solar cell polymers.
It is reported that this modification technology can increase the efficiency of solar cells by more than 30%. Polymer-based solar cells have two domains that contain electron acceptors and electron donor materials.
When light is inhaled, solar cells create energy particles, also known as "excitons." In order to use energy efficiently, excitons must quickly travel to the donor and acceptor areas to retain as much light as possible.
Adjusting the molecular orbital domain (HOMO) occupied by the receptor and the lowest molecular orbital (LUMO) of the polymer is a way to increase the efficiency of the solar cell because the damage of the exciton is the smallest.
The most common way to achieve this type of approach is to add fluorine atoms to the molecular backbone of the polymer. This is a difficult and multi-step process that not only improves the performance of the photovoltaic cell, but also has a very high cost of material production. .
Side-chain modification technology helps improve the efficiency of photovoltaic cells
The chemical team led by Jianhui Hou of the Chinese Academy of Sciences has created a polymer called PBT-OP that consists of two commercial monomers and easily synthesized monomers. Wei Ma, a postdoctoral researcher in physics at North Carolina State University, and the author of the paper's Correspondence Author elaborated the X-ray theory of polymer structure and donor: receptor morphology.
The open circuit voltage of PBT-OP is 0.78 volts, which is 30% higher than 6 volts like polymer.
According to Harald Ade, a physicist and co-author of North Carolina State University, the research method of the research team has several advantages.
Harald Ade claims: "There is a potential flaw in changing the molecular structure of these materials, that is, you are likely to improve a certain performance of solar cells, but did not realize that the equipment has caused unexpected results."
"Based on this kind of situation, we have found a simple way to change the electronic structure and increase the efficiency of equipment by capturing more light energy, and it will not change the ability of materials to absorb, create and transport energy."
The research results of the research group were published online in the magazine "Advanced Materials." In addition, the study was jointly funded by the U.S. Department of Energy, the Science Office, the Basic Energy Science, and the Chinese Ministry of Science and Technology. Dr. Maojie Zhang synthesizes this type of polymer. Xia Guo, Shaoqing Zhang and Lijun Huo from the Chinese Academy of Sciences also contributed to this work.
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