According to a recent report by the Physiologist Network, Japanese scientists found that changing the structure of polymers is expected to significantly improve the photoelectric conversion efficiency of solar cells made from them. The latest research will help scientists to develop more efficient organic- Or inorganic) polymer solar cells.
Organic polymer based solar cells are very important because organic polymers are cheap and easy to handle compared to the polymers used in traditional inorganic solar cells. However, so far, the highest conversion efficiency of polymer solar cells are still unable to meet the practical needs.
However, Osaka Yoshinobu and colleagues at the Emerging Molecular Functional Research Group at the Emerging Materials Science Research Center at RIKEN have come to realize that small changes in polymer structure can change the binding state of polymer chains, Earth to improve the efficiency of solar cells.
As light energy is absorbed by the polymer in a polymer solar cell, the electrons are excited to a higher energy state to produce energetic electrons and a corresponding electron "hole." In order to convert light energy into electricity, these electrons and holes must pass through the polymer to the electrodes and then recombine, but the process loses a lot of energy. Many scientists are conducting various experiments in the hope of making improvements to this conversion process.
Osaka and colleagues used a special type of copolymer containing a repeating structure called PNNT-DT. Osaka explained that "PNNT-DT is very poorly soluble in water, and therefore, We want to make it easier to handle by adding additional alkyl side chains to it. "As they had expected, the change dramatically increased the solubility of the polymer, but" inadvertently " This change also greatly increases the energy conversion efficiency of solar cells made with this polymer.
The polymer was placed in a thin film solar cells, the analysis shows that these new "alkylated" polymer chains will be laid on the battery surface rather than perpendicular to the surface, so that the charge carriers - electrons and holes and The surface is perpendicular rather than parallel, thereby increasing energy conversion efficiency. Osaka said: "This change in structure and direction has led to a photoelectric conversion efficiency of 5.5% from the current rate of no alkylation to the current 8.2%."
Osaka and colleagues hoped that a similar experiment could be carried out with other polymers to produce organic polymer solar cells with a photoelectric conversion efficiency of more than 15% or more efficient inorganic solar cells. "We need to understand better why there is such a shift in the orientation of the polymer, and then we need to do the same experiment on other polymers that absorb more visible light," he said.
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