Research On Crystalline Silicon Solar Cells And Their Electron Irradiation

Key technologies and its mechanism for improving crystalline silicon solar cells in the scale manufacture have been researched in this thesis. After SiOa surface passivation and forming gas treatment utilization in the scale manufacture, the surface recombination and series resistance of solar cells have been reduced while their open-circuit voltage, fill factor and efficiency improved. The performances of multicrystalline silicon solar cells were improved after porous silicon heavy phosphorous diffusion passivation and low frequency plasma hydrogen passivation. Research on surface and grain boundary passivation mechanism obtained effects of surface recombination on crystalline silicon solar cell performance and the theoretical expression of grain boundary recombination velocity. The limit ratio of short-circuit current increment for anti-reflection coating utilization on solar cells was obtained. The crystalline silicon solar cell spectral response, contact resistance and minority carrier lifetime measurement systems were established. The report for SiO2 passivation and forming gas treatment utilization in domestic scale manufacture as well as the detail abroad technologies has not been read. Porous silicon heavy phosphorous diffusion passivation and grain boundary recombination velocity for multicrystalline silicon solar cells have not been reported.From theoretical research and experimental proofs the key factor affecting open-circuit voltage of crystalline silicon solar cell under low illumination is its shunt resistance, which can be a reference for crystalline silicon solar cells utilization under low illumination. Similar research has not been reported.It was first discovered that open-circuit voltage decay in multicrystalline silicon solar cells is smaller than that of in monocrystalline silicon solar cells through electron irradiation, which is explained from electron irradiation mechanism and the structure of multicrystalline silicon solar cells and also has not been reported.