Study On The Preparation Of Flexible Antireflection Films For Solar Cells

The main research contents in this dissertation are as follows:(1)The millimeter-scale cylindrical lens array ERP antireflective coating(ARC)was designed and fabricated.Using millimeter-scale flat-convex cylindrical glass lens array as template,an epoxy resin polymer(ERP)ARC with flat-convex cylindrical lens array structure was prepared by two-step template replication method.The simulation and test results based on optics and electricity show that the efficiency improvement of the ARC on solar cells is related to the thickness of the supporting layer(the film between the lens and the surface of the solar cell)due to the focusing effect of the lens.Appropriate thickness of support layer can effectively improve the efficiency of crystalline silicon solar cells.More importantly,the millimeter-scale array ARCs designed and fabricated are simpler than the micro/nano structure ARCs widely studied,and are suitable for low-cost industrial production.(2)Design and fabrication of dual polydimethylsiloxane(PDMS)ARCs with two different array structures.Submillimeter-scale flat-concave cylindrical PDMS films were fabricated by template replication method.Then nano-wrinkles were formed on the surface of concave cylindrical surfaces by plasma surface modification method.Thus,a dual PDMS ARC composed of nano-gratings and submillimeter-scale concave cylindrical arrays was obtained.The test results show that the efficiency of silicon solar cells can be increased from 17.5% to 18.34% by using this dual ARC.The nanonipple array structure was fabricated by photolithography,and the nano-imprint method was used to imprint the nano-array structure onto the surface of the millimeter-scale flatconvex cylindrical lens array to form a composite nano-millimeter array structure PDMS dual ARC.The test results show that the efficiency of commercial crystalline silicon solar cells can be increased from 18.60% to 19.52%,and the solar cells have good all-day efficiency improvement with the dual ARC.(3)The fabrication of high efficiency foldable crystalline silicon solar cell module.Nanostructured ARCs were fabricated by plasma bombardment on the surface of PDMS.The small 2 mm×2 mm units of solar cells were arranged by PDMS and adhered to the nanostructured PDMS antireflective films to form a flexible and foldable crystalline silicon solar cell module.Optical measurements show that the reflectivity of the front surface of solar cells can be reduced from 7.2% to 5.2% by flexible nano-folded antireflective film.Measurements of electrical properties show that the short-circuit current of each unit cell can be increased from 0.409 A to 0.421 A by flexible nanowrinkled antireflection coating.