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As the world shifts toward renewable sources of energy, solar photovoltaic cells have become an essential part of the sustainable source of power. Among all renewable energies, photovoltaic benefits form many advantages such as unlimited renewable source of energy, increasingly cost competitive, environment friendly. Photovoltaic syster use cells to convert sunlight into electricity.
Graphite is an excellent conductor of electricity, which makes it ideal for use in the electrical contacts of solar cells. Electrical conductivity is vital to efficiently transmit the electrical energy generated by the photovoltaic process.
Solar cells must endure varying temperatures, especially during the manufacturing and operational phases. Graphite exhibits excellent thermal stability, maintaining its properties and performance in high-temperature environments, which is essential for both the production process and the long-term durability of the cells.
Graphite's low coefficient of thermal expansion ensures dimensional stability in solar cell components during heating and cooling cycles, which reduces the risk of cracking or warping. This is especially important during processes that involve rapid temperature changes, such as during the firing of solar cell materials.
Graphite is resistant to most corrosive elements and chemicals, which is advantageous during the manufacturing process of solar cells and the handling of potentially aggressive materials (e.g., during the processing of silicon). It helps maintain the integrity of the production tools and machinery, ensuring that graphite-based products do not contaminate the solar cells.
Graphite can be combined with other materials to tailor its properties for specific applications. For example, composite graphite materials may be used in the production of specialized components such as conductive inks or as a part of the conductive paste used for screen printing solar cell contacts.
Graphite’s self-lubricating characteristics reduce friction and wear during the manufacturing process. This helps in reducing mechanical stresses on machinery and ensures smoother operation in automated production lines.
The most important raw material in the production of solar cells in the photovoltaic industry is multicrystalline and monocrystalline silicon. For the production of multicrystalline and monocrystalline silicon, graphite components are essential for this highly sensitive process of crystal growth. Thanks to its outstanding properties graphite is the unique and only material to withstand high temperature, corrosion and the severe conditions on these production process.
These include highly pure graphite electrodes for the deposition of highly pure polysilicon, graphite heaters, crucibles and insulation components for Czochralski pulling of monocrystalline silicon ingots, PECVD graphite boat.
1. High pure graphite electrodes for the deposition of highly pure polysilicon.
Graphite Electrodes/ graphite seed-chucks
Our high purity graphite products are extensively used in reactors and converters in the manufacturing process for high-purity polysilicon, the raw material of the silicon wafers used in semiconductors and photovoltaic cells.
Graphite electrodes， also called graphite seed-chucks, are mostly made from purified isostatic graphite. Graphite seed-chucks come into direct contact with the silicon seed.
Features
Excellent Electrical Conductivity
Excellent Thermal Durability
Excellent Chemical Resistance
High purified products is available
2. Graphite Components for mono silicon crystal growth
Solar cells can be obtained by mono crystalline based silicon solar cells. The silicon wafers are cut out of silicon ingots grown by the Czochralski (CZ) method.
The crystal growing furnaces used for this process operate at high temperatures, around 1500°C. The furnace is equipped with graphite hot zone consisting of a heater, outer tubes, rings, quartz crucible susceptor and other graphite components, depending on the design.
3. Graphite Components for polycrystalline silicon ingot casting furnaces
When manufacturing the silicon ingots used to form photovoltaic cells, the melting temperature is extremely high at approximately 1,500°C. Our isostatic grpphite has excellent thermal durability, therefore it is used in crucibles, heaters, protective covers for insulation, and other components used in polycrystalline silicon ingot casting furnaces.
4. Graphite Components for polycrystalline silicon ingot casting furnaces
When manufacturing the silicon ingots used to form photovoltaic cells, the melting temperature is extremely high at approximately 1,500°C. Our isostatic grpphite has excellent thermal durability, therefore it is used in crucibles, heaters, protective covers for insulation, and other components used in polycrystalline silicon ingot casting furnaces.
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