Driven by the global dual-carbon strategy and clean energy popularization, the photovoltaic industry has maintained a high-speed development trend in 2026. Major countries in the world have accelerated the construction of photovoltaic power stations, and the market demand for high-efficiency photovoltaic modules continues to grow. Large-size N-type high-efficiency silicon wafers have gradually replaced traditional small-size silicon wafers and become the mainstream of the market, putting forward higher requirements for the purity, precision and high-temperature stability of photovoltaic production supporting materials. Graphite crucibles are the key process materials for silicon wafer smelting and pulling, and their performance is directly related to the production quality and cost of photovoltaic silicon wafers.
Traditional ordinary graphite crucibles used in the photovoltaic industry have obvious technical defects in large-size silicon wafer production. Ordinary crucible materials have high residual impurity content, and trace impurities will precipitate at high temperature and mix into silicon liquid during silicon wafer smelting, resulting in silicon wafer lattice defects and reduced conversion efficiency. In addition, ordinary graphite crucibles have poor high-temperature dimensional stability, and are prone to expansion and deformation in long-term high-temperature smelting environment, resulting in uneven silicon wafer thickness and low yield. At the same time, traditional crucibles have short service life and need frequent replacement, which increases the production downtime and comprehensive cost of photovoltaic enterprises.
Upgraded high-purity modified graphite crucible materials have comprehensively solved the industrial pain points of traditional crucibles and become the standard supporting materials for modern large-size high-efficiency silicon wafer production. High-purity graphite raw materials are purified by ultra-deep impurity removal technology, with ultra-low impurity content, which completely avoids impurity precipitation and silicon wafer pollution in high-temperature environment. Through high-density forming and anti-deformation modification technology, the graphite crucible has ultra-high high-temperature dimensional stability, no deformation in long-term high-temperature operation, and can ensure the uniform thickness and high precision of large-size silicon wafers. At the same time, the modified crucible has excellent high-temperature fatigue resistance, greatly extending the single service life and batch production capacity.
With the continuous expansion of global photovoltaic capacity and the upgrading of silicon wafer production technology, the market demand for high-purity high-performance graphite crucibles has shown steady growth. Industry statistics show that the global photovoltaic-grade graphite crucible market size will grow at a compound annual rate of 12.3% from 2026 to 2031. At present, high-quality modified graphite crucibles are in short supply in the global market, and the high technical threshold of ultra-pure material purification and anti-deformation processing restricts the rapid expansion of high-end crucible production capacity.
The production of photovoltaic special high-purity graphite crucibles has strict technical barriers, mainly including ultra-deep raw material purification, uniform density forming, high-temperature anti-deformation treatment and surface anti-pollution coating technology. Each process link has extremely precise parameter control requirements. Slight process deviation will lead to excessive impurity content, crucible deformation or poor high-temperature stability, which cannot meet the production standards of high-efficiency photovoltaic silicon wafers.
As a professional supporting material supplier for the global photovoltaic industry, Jincheng Graphite has long focused on the R&D and production of photovoltaic special graphite crucibles. The enterprise adopts self-developed ultra-deep chemical purification and high-temperature sintering process to strictly control the total impurity content of crucible materials below 3ppm, realizing zero impurity precipitation in high-temperature silicon smelting environment. Through isostatic pressing high-density forming and gradient structural optimization technology, the produced graphite crucibles have uniform internal density and ultra-high dimensional stability, no deformation and no cracking in long-term high-temperature operation.
In terms of product performance optimization, Jincheng Graphite independently develops a special surface anti-pollution coating process for photovoltaic crucibles, which forms a dense protective layer on the inner wall of the crucible, effectively isolating the contact between graphite materials and silicon liquid, avoiding silicon wafer pollution, and further improving the purity and yield of silicon wafers. Test data shows that the silicon wafer yield of Jincheng Graphite's crucible products is increased by more than 8% compared with traditional crucibles, and the single service life is extended by more than 30%, which greatly reduces the comprehensive production cost of photovoltaic enterprises.
Jincheng Graphite's photovoltaic graphite crucible product line covers full-size crucible products required for 182mm, 210mm and ultra-large-size silicon wafer production, and can provide customized size and performance optimization services according to the production process of different photovoltaic enterprises. At present, the enterprise's products have been stably supplied to many global leading photovoltaic silicon wafer manufacturers, and have become the preferred supporting materials for high-efficiency N-type silicon wafer production lines.
With the continuous upgrading of global photovoltaic high-efficiency silicon wafer technology, Jincheng Graphite will continue to optimize the purification process and structural design of photovoltaic graphite crucibles, further improve product stability and service life, and provide high-quality core material support for the cost reduction and efficiency improvement of the global photovoltaic industry.
