Research On Modification Of P25Nanopartical And Al-BSF Of Silicon Based Solar Cells

TiO₂nanomaterials are widely used in solar cell and light catalysisdue to its non-toxic, cheap, excellent thermal stability and chemicalstability, especially large specific surface area, rapid transmissionphotocarrier ability, and the corresponding modification ofnanomaterials also have become hotspots. At present two main aims ofthe solar cell research are still lower manufacturing cost and higherefficiency of conversion. To meet the requirements of lower cost, thethickness of the battery become thinner and thinner, so the batteryneeds more ingenious internal structure design, and some specialprocesses should be applied to improve the efficiency of the cells, theintroduction of aluminum back surface field （Al-BSF） can not onlyimprove the larger extent silicon-based solar cell transformationefficiency, but also avoid the negative effects of thickness decreases.Many investigations have been done base on current research athome and abroad in this paper, the main significant conclusions weregiven as follow:1. Anatase TiO₂nanowires with a diameter of5-10nm and length of500nm to2μm have been successfully synthesized by modifying TiO₂nanoparticles （P25） using the microwave heating method.2. The formation, size and phase transformation of TiO₂nanowireswere effected by microwave radiation pressure, temperature, durationand post treatments, a proper temperature and duration condition of175-260℃and40-70min were critical for the growth of as-preparedTiO₂nanowires.3. It’s found that the special surface area, optical properties andphoto catalytic activity of the as-prepared TiO₂samples weresignificantly improved by microwave heating method. 4. A platter Al-BSF was fabricated by traditional annealing way thanrapid treating process on p-silicon substrate, and the Al pastes of bothsamples were coated by screen printing method.5. Annealing temperature, duration and heating rate were keyparameters for the morphology, concentration, conductivity, thicknessand density of alloy and highly-doped region, and the optimalpreparation condition for a good Al-BSF （800℃，20min，in conventionalheating way） was summarized in lab.