PHOTON 第二届光伏设备会议讲稿集 03 06.pdf

PHOTONs 2nd PV Production Equipment Conference Shenzhen Jan 16, 2008 Monocrystalline Silicon Growth Monocrystalline Silicon Growth • Market Drivers • Equipment Status • Productivity Improvements Market Drivers • Cell Efficiency – Mono cells produce 6% to 10% more power than multi cells in real world applications – Advantage multiplies with the high cost of installed module systems – Higher efficiencies obtainable by some manufacturers with specialized cell techniques • Polysilicon – Supply/Demand to remain out of balance and prices to remain high – Higher value mono cells more suitable for costly virgin poly • Slicing – Mono ingots produce higher yields with ultra thin slicing Demand for CZ pullers will continue to grow at a high rate despite throughput and raw material quality advantages of multi Market Drivers • Cell Size – New capacity predominantly in 150 mm p-sq cells vs 125 mm – Need for CZ pullers sized for productive growth of ~210 mm diameter crystals • 22” – 24” crucibles • 120 kg – 150 kg charges – Lack of standards Some crystals ~175 mm diameter – Shift to larger sizes likely to occur slowly (175 mm to 200 mm p-sq cells) will require pullers for ~230 mm to ~300 mm diameter crystals. CZ solar growers increasing in size and charge capacity Flexibility for growing various diameters desirable Equipment Status • New pullers already developed for range of crystal sizes/lengths in demand • Modifications made for longer ingot lengths (2 m) and emphasis on cost/value for PV • Two zone heating – Maximize charge size for given furnace – Reliable melting; less crucible damage – Lower ox