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, a research team at Yale University used the 'diatom' material and its 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 an efficient source of light energy conversion; and California Polytechnic engineers are using photon manipulation technology and thermoelectric technology developed a photodetector, in order to improve the efficiency of solar energy collection.Recently, in response to this problem, Shanghai Jiaotong University Institute of Solar Energy Professor Shen Wenzhong and his team Also with the help of nanotechnology has given its own research solutions.
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 angle problem, the number of photons captured by the solar cell device can be increased, thereby effectively increasing the power generation of the solar cell.
At the same time, the team also pointed out that although the current chase system can be used to solve this problem, but the use of the system requires a high cost, so the cost factor also need to be considered.In face of the above two challenges, the research team using the whole solution in Solar cell surface preparation of silicon nano-pyramid structure array, thereby greatly reducing the solar cell anti-anti-reflection capability of the incident angle in accordance with tolerance, and improve all-weather and year-round ability to capture solar photons.
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 same time with lower carrier recombination properties.In addition, there are also nano-pyramid suede production methods, but the existing method is costly and the manufacturing method is complex, is not conducive to the promotion and use of solar cell production line .
In response to this problem, the research team used their own metal-assisted alkaline etching method to prepare silicon nano-pyramid suede for the fabrication of nanometer pyramid materials, which is a complete solution preparation process with simple and low cost manufacturing process and Compatible with existing production lines.
It is reported that the research team in Shanghai experiment with this new type of solar cells.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.
