Application Of Nitrogen-doped Czochralski Silicon In Solar Cell

As an important renewable green energy, solar energy may become the substitute of the un-renewable energy such as petroleum and coal. Solar cell is an effective device to convert solar energy into power. Now the silicon solar cell is the broadest application among the solar cells, but its cost is too high to be widely applied. Obviously, reducing the cost of the silicon solar cell is very important. The cost of nitrogen-doped Czochralski silicon is lower than that of the Czochralski silicon. Moreover, the wafer can be cut even thinner due to the mechanical strength of the nitrogen-doped Czochralski silicon is higher than that of the Czochralski silicon. Therefore, nitrogen-doped Czochralski silicon may reduce the cost of the solar cell if it is used in the solar cell. However, until now the application of the nitrogen-doped Czochralski silicon in solar cell has not been investigated.This paper deals with the application of the nitrogen-doped Czochralski silicon in solar cell, main contents and results are as follows:1) It was found that nitrogen did not affect the minority-carrier bulk lifetime of the silicon wafers as well as its linear distributions along the diameter direction and the linear distribution of interstitial oxygen atoms along the radius direction.2) The oxygen precipitation behavior of the nitrogen-doped Czochralski silicon showed that there was no oxygen precipitates generated in the simulated solar cell process, which indicated that nitrogen did not affect oxygen precipitation in the process, and thus did not affect the effects of the phosphorous gettering.3) It was found that nitrogen could enhance the minority-carrier lifetime degradation of the silicon wafer, which indicated that nitrogen could boost the generation of the B-O complex. The structure of the B-O complex is also discussed.4) Shallow junction with high surface carrier concentration was fabricated through an effective diffusion barrier formed by oxidization of silicon.5) Nitrogen-doped Czochralski silicon solar cell with an efficiency of 14.36% was fabricated.From the above research, it can be concluded that the nitrogen-doped Czochralski silicon could be used in solar cell.