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1、Efficiency Improvement by Efficiency Improvement by Selective Emitter Solar CellsSelective Emitter Solar CellsDr. Jianhua ZhaoVice Chairman,President and Chief ScientistChina SunergyNanjing, China太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士The Structure of Selective Emitter CellsTh
2、e Structure of Selective Emitter CellsMetalgridRearmetalSECellStructure太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士Optimization of Screen Printed Solar CellsFor emitter contactFor light collectionEmitter sheet ResistanceParameter Optimization太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sun
3、ergy中电光伏赵建华博中电光伏赵建华博士士For emitter contactFor light collectionEmitter sheet ResistanceCell efficiencyOptimization of Screen Printed Solar CellsCell Performance太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士Cell efficiencyFor emitter contactFor light collectionEmitter sheet ResistanceCe
4、ll efficiencySE cell OptimizationCell Performance太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士CellNo.CellNo.VocVocIscIscFFFFEffic.Effic.PmppPmpp (mV)(mV)(A)(A)(%)(%)(%)(%)(W)(W)1 1625.6625.65.3645.36478.678.617.717.72.6372.6372 2627.3627.35.3345.33478.678.617.717.72.6302.6303 3628.2
5、628.25.3335.33378.778.717.817.82.6382.6384 4625.6625.65.3585.35878.578.517.717.72.6322.632The electrical performance of 125mm X 125mm mono The electrical performance of 125mm X 125mm mono c-Si SE cells, as measured by Fraunhofer Institute of c-Si SE cells, as measured by Fraunhofer Institute of Sola
6、r Energy Systems, under STC 1000W/mSolar Energy Systems, under STC 1000W/m2 2, AM1.5 , AM1.5 global spectrum, at 25C.global spectrum, at 25C.Electrical Performance of SE CellsElectrical Performance of SE Cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士The illustrated diagram is ci
7、ted from the testing report of Fraunhofer ISE. A = 148.81 cm2Voc = 628 mVIsc = 5.33 AFF = 78.7 %Effic. = 17.8 %PMPP = 2.638 WThe Achievements obtained from SE CellsThe Achievements obtained from SE CellsExcellent electrical performance of SE cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中
8、电光伏赵建华博士士The Achievements obtained from SE CellsThe Achievements obtained from SE CellsExcellent electrical performances of SE cellsDue to the light diffusion on the illuminated emitter area, the SE Cells demonstrated very higher Voc and IscDue to the heavy diffusion on the metal contact area, the S
9、E Cells demonstrated excellent high FF太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士Excellent electrical performances of SE cellsThe energy conversion efficiencies of SE cells are between 17.0% and 18.0% , the average efficiency is around 17.5 % . When these SE Cells were encapsulate
10、d into modules , they produced power as high as 185 W .SE Cells have very high Rsh, and very low reverse current density.The Achievements obtained from SE CellsThe Achievements obtained from SE Cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士Very low reverse currentThereversecurre
11、ntofcellsmadebyhighqualitywafers(125mm*125mm)wereextremelylow.Mostlythereversecurrentwasintherangeof20mAto30mA.Andevenwhenthewafersqualityarerelativelypoor,thereversecurrentweremerely100mAto200mA.Excellentperformanceunderlowlighting,lowhotspoteffectThe Achievements obtained from SE CellsThe Achievem
12、ents obtained from SE CellsExcellent electrical performances of SE cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士The low degradation under the sunlight exposureAccording to the preliminary testing, the degradation of the power output from the SE Cell before encapsulation was les
13、s than 1.5%, this degradation is much less than conventional cells:The Achievements obtained from SE CellsThe Achievements obtained from SE Cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士The Advantages during the manufacturing of SE Cells. Not picky at wafer qualities. The averag
14、e energy conversion efficiency was always higher than 16.8% from the cells made of relatively poor quality wafers The average energy conversion efficiency were between 17.5% and 18% from the cells made of high quality wafers. Uniform cell performance with stable processing control. The process is re
15、latively easy to controlThe Achievements obtained from SE Cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士SE cells have been successfully applied into commercial SE cells have been successfully applied into commercial production and reached full capacity within a couple of product
16、ion and reached full capacity within a couple of weeks.weeks.The first production line was established in China Sunergy The first production line was established in China Sunergy in mid November, 2007. the cell performances from the in mid November, 2007. the cell performances from the production li
17、ne are better than the cell from trial production production line are better than the cell from trial production within one week since production commence. within one week since production commence. The daily production is 20 thousand cells before the end of The daily production is 20 thousand cells
18、 before the end of November. China Sunergy produced 2MW SE Cells with the November. China Sunergy produced 2MW SE Cells with the energy conversion efficiency higher than 17% in 2007.energy conversion efficiency higher than 17% in 2007.China Sunergy will have five SE Cell production lines in China Su
19、nergy will have five SE Cell production lines in August, 2008, and will provide our customers with more and August, 2008, and will provide our customers with more and more high quality products. more high quality products. The Achievements obtained from SE CellsThe Achievements obtained from SE Cells太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士 Thanks!太阳能发电峰会资料太阳能发电峰会资料China_SunergyChina_Sunergy中电光伏赵建华博中电光伏赵建华博士士
