solar emerge is a useful and unlimited power. the solar cell is a tool which can translate solar emerge to electric emerge, so it is always a research project focal point in the advanced country。In the recently research , it always focus on the optic-electric transition efficiency，that can be distinguished unto
1.How to increase electric energy level of the
transmission in the semi-conductor material. The research of solar cell can be traced back to 19 century, solar cell was made by GaAs beginning from 1955 by D.A.Janny ，The efficiency is about 5 percents. only and comparing with solar cell made by Si The efficiency of GaAs could not exceed That of Si until to 1972.。In the 1975 to 1985,it The efficiency of GaAs made a lot of improvement. This is due to the progress of P-N junction qualities and the process technology.
2.How to improve the efficiency under fundamental physical behaviors In general ,the reflection of incident ray is 0.3 in the semi-conductor, it means there is only 30 percent reflection rate when the sun-light reach to the surface of solar cell. In order to improve the efficiency ,this research studies was used geometry optical to describe the rays path in the solar cell (Ray Tracing),this method is called ray tracing and ray tracing can trace the ray path in the component. It can get a distribution map of luminance by sampling.
this studies was used this method to design a high-performance structure was named Micro Lens. The theorem is to design the anti-reflection as Micro lens, it can focus rays to the electric layer even the reflect rays, comparing to the produced structure of solar cell. The final result was shown the efficiency improved about 7 to 18 percents higher
