CV21cellENGLISH.pptx

書式設定,書式設定,第,2,第,3,第,4,第,5,#,Thin-film Si solar cell(e.g.a-Si,m,c-Si),may have high potential of lowering cost,but has low efficiency and reliability.,Concept of spherical cell in CV21,Low-cost crystalline Si,solar cell,with comparable performance to c-Si wafer cell!,How to achieve low-cost solar cell?,c-Si wafer solar cell,may have high efficiency and long term stability,but is limited in reducing cost and fragile.,Micro-concentrated Spherical Si solar cell,Silicon sphere,(1mm),Reflector and,n-electrode,(2.2mm),Breakthrough,n-electrode,Silicon wafer,TARGET,1,/,6,USP:6,706,959 JP:3490969,第,217869,号,Comparison of Output Current,q,is not equal to zero,High reflectance loss,at edge,Low,J,sc,(-10%compared with flat cell),Sphere,center,q,Incident light,In case no reflector is used,Flat cell,Incident light,Comparison of Output Current,2,/,6,Sphere,Incident light,pn junction area,is,4 times larger than light irradiation area,Lower average light intensity on pn junction,Low,V,oc,(-10%compared with c-Si wafer cell),Flat cell,Incident light,pn junction,pn juntion area light irradiation area,pn juntion area light irradiation area,Dark,area,Comparison of Output Voltage,In case no reflector is used,3,/,6,Wafer,PE=,PE=100,-grid electrode area,Dead space among spheres,Low packing efficiency,Low,J,sc,(-10%),c-Si wafer cell,Spherical Si cell,Comparison of Packing Efficiency,dead space,In case no reflector is used,4,/,6,Solve the disadvantages with reflector!,Utilization of reflected light at the edge,High,J,sc,Comparable pn junction area to light irradiation area,High,V,oc,Low-cost Spherical Si cell,with comparable performance of c-Si cell,Hexagonal reflector cup,Negligible dead space,Increase packing efficiency,Top view,Comparable performance to c-Si wafer cell,Reduced number of expensive Si spheres,+,No dark,area,Concept of spherical cell in CV21(2),5,/,6,Spherical Cell Specification,Power(Wp),0.75,V,pm,(V),0.47,I,pm,(A),1.60,V,oc,(V),0.58,I,sc,(A),1.74,Eff,(%),10.0,Weight(g),8.5,Size(cm),15,5,Number of Si Ball,（,Qty,）,1,794,Al substrate and micro reflector cup,Silicon ball,Specifications,6,/,6,