1. How efficient modern solar cells work. Jyunpei Ｙ amamoto

2. Solar Cell ・ Waste does not appear at the time of electric generation ・ It is expensive in comparison with the other generation methods Merit ・ Mechanical trouble does not happen Demerit ・ It don't generate electricity by night, Quantity of generation turns big by weather in the daytime

3. solar cell Now efficient （％） 2025 efficient （％） 2050 efficient （％） crystalline Si 2530 super high efficiency solar cell of 40% lamella Si 1520 CIGS 2030 dye sensitization 1118 organic matter 515 The research and development target of the solar cell

4. ・ The old history and a solar cell with the results ・ Conversion efficiency is around 16% solar cells Polycrystalline silicon solar cells ・ The solar cell which circulates most

5. InGaAs bottom Buffer layer InGaAs middle InGaAs top Base The monorechic structure many joining ・ Technology to raise conversion efficiency because a bandgap joins different plural layers in the vertical direction. ・ More than conversion efficiency 40%

6. Solar Junction of USA It recorded world's best conversion efficiency 43.5% on April, 2011

7. ・ Ultimate form of the many joining is middle band structure solar battery. ・ It can use all wavelengths of the light of the sun. More than conversion efficiency 65%!!! Intermediate band structure solar cell GaAs layer GaAs base p layer n layer I layer quantum dot barrier layer

8. The most efficient solar battery is 43.5% of the Solar Junction now. Conclusion Thank you for listening.