India's first high quality semiconductor wafer manufacturing takes birth in Gujarat

Silicon wafer manufacturing in India for solar cells and microchips requires stringent technical and operational standards to meet the demands of high-performance electronics and renewable energy systems. The process begins with high-purity metallurgical-grade silicon, refined to achieve 99.9999% (6N) purity or higher, essential for both applications. For solar cells, monocrystalline silicon wafers are preferred due to their higher efficiency, while microchips often use polycrystalline or monocrystalline wafers depending on the application.
The manufacturing process involves several critical steps. Refined silica sand is converted into polysilicon through the Siemens process, followed by the Czochralski method to grow single-crystal silicon ingots. These ingots are sliced into thin wafers (typically 100-200 micrometers thick) using wire saws, then polished to achieve a defect-free, atomically flat surface. For microchips, wafers must meet sub-nanometer surface roughness and strict dopant control to ensure consistent electrical properties. Solar wafers prioritize cost-efficiency and uniformity to maximize energy conversion.