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Solar panels separately according to the battery structure. At present, we are divided into four main parts. As for the four main parts which have more advantages, details are as follows: 1. Homogeneous junction solar cells by P - same semiconductor materials N junction is called homogeneous knot, by



solar panels separately according to the battery structure. At present, we are divided into four main parts. As for the four main parts which have more advantages, details are as follows:

1. Homogeneous junction solar cells

P - formed from the same semiconductor materials N junction is called homogeneous knot, formed by homogeneous structure solar cells is called homogeneous junction solar cells.

2。

heterojunction solar cells by two kinds of semiconductor materials with different forbidden band width of knot is called heterojunction, and by the heterogeneous structure formation of the solar cell is called the heterojunction solar cells.

3。

schottky junction solar cells in the metal - Semiconductor interface using schottky barrier structure solar cells called schottky junction solar cells, or called MS battery. At present, has developed a metal oxide semiconductor ( 金属氧化物半导体) The metal - Insulator - Semiconductor ( MIS) The solar cell, etc.

4。

composite solar cells formed by two or more PN junction solar cells called compound junction solar cells, and further divided into vertical multijunction solar cells and level of multi-junction solar cells, such as ( MIS) The solar cell and PN. It can form efficiency is as high as 22% efficient MISNP composite silicon solar cells. Compound junction solar street lamp light, usually made of cascade type, placed in the top area broadband gap materials to absorb the sun's high-energy photons; Narrow band gap materials used to absorb low energy photons, to broaden the spectral response of the whole cell. The current development of gallium arsenide aluminum - Arsenic - silicon The efficiency of silicon solar cells has reached to 31%.