At present, the low efficiency of solar cell collection is a common problem. Many researchers in academia have put forward many solutions to this problem.
For example, research teams at Yale University use "diatoms" as materials and their light-harvesting ability to improve the conversion efficiency of organic solar cells; the University of California, Berkeley research team uses the bacteria that grow as efficient materials for converting light energy; and California Polytechnic engineers are using photon manipulation of nano-photon technology and thermoelectric technology developed a light detector, in order to enhance the efficiency of solar energy collection. Recently, in response to this issue, Prof. Shen Wenzhong and his team from Shanghai Jiaotong University Solar Energy Research Institute have also given their own research solutions using nanotechnology.
The research team pointed out that due to the rotation and revolution of the earth, the incident angles of solar light on solar cell devices are different at different times and in different times of the day. Generally, as the incident angle increases, the reflected light loss will be more serious.
Therefore, based on this thinking, the research team said that by solving the problem of angle, the number of photons captured by the solar cell device can be increased, so as to effectively increase the power generation of the solar cell.
At the same time, the team also pointed out that although the chase system can now be used to solve this problem, but the use of the system requires a high cost. Therefore, the cost factor also needs to be considered. Faced with the above two challenges, the research team used full solution method to prepare a silicon nanometer pyramid structure array on the solar cell surface, thereby greatly reducing the anti-reflection ability of the solar cell according to the incident angle, improving all-weather and year-round capture of solar photons ability.
It is noteworthy that, in the choice of nanostructured materials, nanowires, nano-holes, nano-cone have excellent wide-angle anti-reflection performance, but here why choose nano-pyramid structure?
The study found that, in addition to the nano-pyramid structure, other nano-structured materials have a larger specific surface area, it is easy to cause serious surface charge carrier recombination losses, which will greatly reduce the conductive properties, and this nano-pyramid structure material has advantages Of the optical characteristics of the lower carrier complex characteristics. In addition, there are nano-pyramid suede production methods at present, however, the existing methods are expensive and complicated to manufacture, which is not conducive to the popularization and use of the solar cell production line.
In response to this problem, in the production of nano-pyramid materials, the research team used their own metal-assisted alkaline etching method to prepare silicon nano pyramid suede. This is a complete solution preparation process that is simple and cost-effective to manufacture and compatible with existing production lines.
It is told that the research team in Shanghai with this new type of solar cell experiments. The results show that in terms of power generation, this battery up to 2.5% higher than the traditional solar cells.
After a series of improvements, whether it is from the technology itself or the cost of production requirements, this nano-pyramid suede battery is the preferred battery of its kind, it can maintain superior battery performance in all directions, to achieve a higher power generation.