1, according to the different structure can be divided into the following categories.

(1) homojunction solar cell from the same material composition of one or more semiconductor pn junction solar cell. Such as silicon solar cells, GaAs solar cell and so on.

(2) heterojunction solar cells using two different band gap semiconductor material in the phase of the interface forms a hetero pn junction solar cell. Such as indium tin oxide – silicon solar cells, cuprous sulfide – cadmium sulfide solar cells and so on. If the two heterogeneous lattice structure similar to the interface is better lattice match, then known as the solar surface heterogeneity. Such as aluminum gallium arsenide – GaAs heterojunction solar cells and other surfaces.

(3) metal and semiconductor Schottky contacts for solar cells to form a “Schottky barrier” of the solar cell, solar cells, also known as MS. The principle is based on the metal – semiconductor contact under certain conditions, can produce rectifying Schottky contact effects. Has developed into a metal – oxide – semiconductor solar cell, which MOS solar cells; metal – insulator – semiconductor solar cells, solar cells or MIS. Such as platinum – Silicon Schottky solar cells, FUJITSU LifeBook M2011 battery aluminum – silicon Schottky barrier solar cells and so on.

Second, in accordance with the materials classified

(A) in accordance with the different materials can be categorized as follows.

(1) silicon solar cell silicon solar cell material as the matrix. Such as single crystal silicon solar cells, polycrystalline silicon solar cells, amorphous silicon solar cells and so on. Production of polycrystalline silicon solar cell material, with the purity of solar grade silicon is not too high, you can. The solar grade silicon metallurgical grade silicon by the simple process can be processed. Another strip of polysilicon materials, silicon, cast silicon, polycrystalline silicon and other films. Solar cells made with them are two kinds of film and sheet.

(2) inorganic compound semiconductor solar cells including: ① CdS solar cells to CdS single crystal or polycrystalline solar cells as the substrate material, such as cuprous sulfide – cadmium sulfide solar cells, cadmium telluride – cadmium sulfide solar cells, copper indium selenium, etc. ^ CdS solar cells; ② gallium arsenide solar cells to GaAs-based solar cell materials. As GaAs heterojunction solar cells, gallium arsenide heterojunction solar cell, etc..

(3) sensitized nanocrystalline solar cells to Ti02, Zn0, Sn02 and other wide band gap semiconductor oxide-based nano-electrode, using dye-sensitized, Lenovo IdeaPad U350 battery narrow band gap inorganic semiconductor sensitization, sensitization of transition metal ion doping organic dye / inorganic semiconductor-sensitizing and deposited on the surface Ti02 solar cell made of precious metals and other methods.

(4) organic solar cell with phthalocyanine, porphyrins, perylene, chlorophyll-based solar cell materials. Such as organic pn junction solar cell, solar cells and other organic Schottky type.

(5) plastic solar cells, such as polyacetylene solar cells, conjugated polymer / C40 composite solar cells and so on.

(B) The photoelectric conversion mechanism Categories

(1) Traditional solar cells absorb the photons are mainly those that produce electron – hole pairs (carriers) and carrier transport at the same time the solar cell. Such as silicon solar cells, CdS solar cells, GaAs solar cell and so on.

(2) exciton absorption of solar photons are mainly those that produce excitation states, then the electron transfer of the solar cell. Such solar cells absorb light energy and transmission charges are borne by the dye and semiconductor. Such as organic solar cells, plastic solar cell, HP ProBook 4311s battery quantum well cell (only in theory>.

Book focuses on organic solar cells, plastic solar cells, but because of this Type II cell theory is not perfect, is still drawing most of the traditional theory of solar cells.