CEEG NJPV CEEG Nanjing PV-Tech Co. PRODUCTION TECHNOLOGIES FOR HIGH EFFICIENCY CRYSTALLINE SILICON SOLAR CELLS Jianhua Zhao CEEG Nanjing PV-Tech Co. Ltd Focheng Rd(w), Jiangning Economic & Technical Development Zone Nanjing, CHINA email: zhaojh@njpv-tech CEEG Nanjing PV-Tech Co. CEEG NJPV CEEG Nanjing PV-Tech Co. CEEG Nanjing PV-Tech Co. has started production of standard screen printed cells since June with a capacity of 30 MW/y. Two more cell lines should be installed by the end of 2005. This will increase the production capacity to about 100 MW/y. CEEG Nanjing PV-Tech Co. CEEG NJPV TABLE OF CONTENT 1. High Efficiency Silicon Solar Cell Fabrication Requirements 2. High Efficiency Silicon Solar Cell Production Ready Technologies 3. Material Developments by Silicon Wafer Manufacturers CEEG Nanjing PV-Tech Co. CEEG NJPV 1. High Efficiency Silicon Solar Cell Fabrication Requirements: 1. A high quality substrate with a long carrier lifetime in millisecond range. 2. Good surface passivation with low surface recombination velocity. 3. Low surface reflection with a good light trapping scheme. 4. A proper emitter design to collect all the light generated carriers and a proper metal contact scheme for minimum series resistance CEEG Nanjing PV-Tech Co. CEEG NJPV 1.1. High effective carrier lifetimes have been measured in n-type silicon materials Alneal: FGA: 350 380 400 420 440 390 390°C Wafer ??cm Manuf. 7 5 3 1 n-FZ 1.5 Topsil n-FZ 0.9 SEH n-Cz 5.5 SEH n-Cz 1.3 SEH n-Cz 0.4 SEH Storage: 3