优化后的ESS®E2M原料在多晶和单晶太阳能行业的应用

APPLICATION OF OPTIMIZED ESS/E2M FEEDSTOCK FOR HP MULTI AND MONO CRYSTALLINE SOLAR INDUSTRIES Eddie Hsueh 薛丞智 博士 Product manager 产 品 经 理 , ESS/Ingot technology Outline 2 ❑ Introduction to REC Solar ❑ What is ESS Elkem Solar Silicon ❑ What is the benefit for use ESS as a feedstock High filling density for Multi-Si furnace Low Carbon Footprint Flat resistivity profile Optimized for PERC cell ❑ ESS to MonoE2M new product designed for Mono E series and R series ❑ Test results for E2M 40 28 32 EMEA APAC USA REC – A global PV manufacturer with over 20 years of experience W orlds m ost pow e rful 28 36 36 Residential Commercial Utility Founded 1996 12M people powered at home 30 million solar panels produced and sold USD 630 million 2017 sales revenue 2,000 employees globally Norway Singapore Manufacturing facilities Balanced global sales By geography and market segment 3 REC – Global presence with a focus on EU, US, and APAC markets, employing 2000 REC office Operational Headquarters Local representatives Munich, Germany New Delhi, India Singapore Tokyo, Japan Oslo, Norway Corporate Headquarters San Mateo, CA USA Melbourne, Australia Herya, NorwayKristiansand, Norway 4 What is Elkem Solar Silicon ESS 5 Brick shaped product, abbreviation ESS Produced via a poly silicon refining route Dense form factor for fast crucible loading Capable for multi mono casting REC Solar Norway - production process for ESS at Fiskaa 6 Silicon metallurgical silicon is produced from quartz in an electric arc furnace, at temperatures above 2,000 degrees C. Slag treatment a purification process, in which the molten silicon is mixed with slag, in order to extract further impurities, especially boron. Leaching a “wet” chemical refining process that, removes phosphorous and metallic impurities from silicon in solid form. Solidification the silicon is melted and directionally solidified through which impurities are segregated and thereafter removed in the subsequent post- treatment process. Post treatment surface washing and cutting. Silicon SolidificationLeachingSlag treatment Post treatment Currently up to 8,400 MT/yr. Typical content of boron B and phosphorus P B 0.20 ppmw and P 0.65 ppmw compensated material Low Carbon Footprint 90 to 96 lower compare to Siemens based polysilicon 7 From batch-based Siemens to cont. production process without Silane gases. ✓ 25 of Siemens energy consumption, and CO2 emissions. ✓ CFP 90 reduction of ESS product, 96 reduction for new mono product E2M. ✓ Energy usage 68 reduction of ESS product, 81 reduction for E2M. ✓ ESS is approved as registered Carbon Footprint CFP product in France. ✓ Energy payback time for solar modules 1.0 year , for ESS 0.1 Module LID2 Higher green factor than E series E series R series Crushed E2M Mixed with poly ESS to MonoE2M simulated resistivity profile Capable for Recharge CZ 12 Target 0.8 ohm with 15 E2M Target 1 ohm with Siemens only Seed Tail RCZ1 0.8 0.7 RCZ2 0.8 0.66 RCZ3 0.8 0.96 Seed Tail RCZ1 0.95 0.68 RCZ2 0.95 0.64 RCZ3 0.95 0.44 E2M test summary- E Series15 filling ratio Preliminary data shows promising. Ingot performanceFlat resistivity profile Cell performanceOptimized for P-mono PERC cell ✓ Flat resistivity profile from 0.8 to 0.67 ohm.cm. ✓ Both RCZ ingots shows consistent flat resistivity profile ✓ Lifetime comparable to reference Siemens poly. ✓ Oxygen comparable and Carbon is higher of 3.8 ppma at last ingot tail end. ✓ Cell efficiency comparable with slightly FF gain. E2M test summary- R Series50 filling ratio Preliminary data shows promising 14 Ingot performanceFlat resistivity profile Cell performanceOptimized for P-mono PERC cell Module performance ✓ Flat resistivity profile from 1 to 0.8 ohm.cm. ✓ Lifetime comparable to reference Siemens poly. ✓ Oxygen comparable and Carbon is slightly higher of 3.29 ppma at tail end. ✓ Cell efficiency gain of 0.1 with FF and Voc gain. ✓ LID comparable and slightly lower 2 Conclusion ❑ Integration of REC and Elkem Strong opportunities to optimize the value chain ❑ Effective use of ESS in the manufacture of High Performance Multi ❑ Successful use of E2M in the manufacture of Mono ❑ 3 Key Advantages of both ESS and E2M product ❖ Environmentally Friendlylow carbon footprint ❖ Efficient use of feedstock packing density for multi-Si, resistivity control ❖ Optimized for P-PERC cell ❑ No compromise to material quality in the manufacture of REC products 15 The content of this presentation is strictly confidential. 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