Although the materials that make up a photovoltaic power system vary, all modules include several layers of material from the lightward side to the backlight side. Sunlight first passes through a protective layer (usually glass) and then enters the cell through a transparent contact layer. At the center of the module is the adsorption material, a layer that absorbs photons to complete the "photogenerated current". The semiconductor materials used in the module depend on the specific PV system requirements.

1. Aluminum alloy frame

First, to protect the glass edge; second, aluminum alloy combined with silicone beating edge to strengthen the sealing performance of the components; third, greatly improve the overall mechanical strength of the components; fourth, to facilitate the installation of the components, transportation; fourth, bearing components and bracket link carrier, through the fixed can achieve the best resistance to load capacity, from the unit fixed to integrated, to enhance the mechanical capacity of the power station system.

2.Silicone

It is used to bond and seal the laminated glass PV modules, bond the junction box and backsheet, and enhance the role of UV resistance of PV modules.

3.Tempered glass

Low iron tempered glass (also known as white glass), in the wavelength range of the solar cell spectral response (320-1100nm) light transmission of more than 93%, for infrared light greater than 1200 nm has a high reflectivity. This glass can also be resistant to solar UV radiation, light transmission does not decline. The glass should be clean and free of water vapor, no bare hands touching the two surfaces of the glass, generally used to support the structure of photovoltaic modules, enhance the weight and load of photovoltaic modules, with light transmission, reflective light transmission, water, gas and corrosion resistance.

4.EVA encapsulation film

Copolymer of ethylene and vinyl acetate, is a hot melt adhesive. Used to encapsulate the cell, prevent the external environment on the electrical performance of the cell, enhance the light transmission of photovoltaic modules, the cell, tempered glass, backsheet bonding together, with a certain adhesive strength, while the electrical performance of the battery photovoltaic module output has a gain effect.

5. Photovoltaic welding tape

Also called tinned copper tape, mainly divided into interconnection strips and convergence strips. Interconnection strip is mainly used in the connection between the photovoltaic module cells, to conduct electricity and collect the role of the cell current; sink strip is mainly used in the connection between the battery string of the module, the solar cell current generated by the solar cell gathered into the junction box.

6. Battery

Solar cell is a device that converts light energy directly into electricity. It is made of semiconductor materials. Through the irradiation of sunlight, the electron-hole pairs are excited, and the electrostatic field in the potential barrier area of the P-N junction is used to separate the electron-hole pairs, and the separated electrons and holes are collected and output to the outside of the cell through the electrodes to form the current.

7. Backplane

It is used as the backside protective encapsulation material, the most common ones are TPX, KPX and PET, etc. It is used to enhance the aging resistance and corrosion resistance of PV modules, which prolongs the service life of PV modules; the white backsheet scatters the light incident to the inside of PV modules, which improves the light absorption efficiency of PV modules, and also reduces the working temperature of PV modules because of its high infrared emissivity; at the same time, it improves the insulation performance of PV modules. It also improves the insulation performance of the PV module.

8. Junction box

Installed in the photovoltaic module to play a role in the transmission of current, with good electrical performance at the same time, the design and size of the junction box must meet the requirements of the use of the environment, including: electrical, mechanical, heat, corrosion and weather resistance. At the same time can not bring harm to the user and the environment.