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Temperature Effect on Light Concentration Silicon Solar Cell’s Operating Point and Conversion Efficiency

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Document pages: 12 pages

Abstract: It is well known that temperature acts negatively on practically all theparameters of photovoltaic solar cells. Also, the solar cells which aresubjected to particularly very high temperatures are the light concentrationsolar cells and are used in light concentration photovoltaic systems (CPV). In fact, the significant heatingof these solar cells is due to the concentration of the solar flux whicharrives on them. Light concentration solar cells appear as solar cells understrong influences of heating and temperature. It is therefore necessary to takeinto account temperature effect on light concentration solar cells performancesin order to obtain realistic results. This one-dimensional studyof a crystalline silicon solar cell under light concentration takes intoaccount electrons concentration gradient electric field in the determination ofthe continuity equation of minority carriers in the base. To determine excessminority carrier’s density, the effects of temperature on the diffusion andmobility of electrons and holes, on the intrinsic concentration of electrons,on carrier’s generation rate as well as on width of band gap have also beentaken into account. The results show that an increase of temperature improvesdiffusion parameters and leads to an increase of the short-circuit photocurrentdensity. However, an increase of temperature leads to a significant decrease inopen-circuit photovoltage, maximum electric power and conversion efficiency.The results also show that the operating point and the maximum power point (MPP) moves to the open circuit when thecell temperature increases.

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