Question: A multijunction solar cell with more than three junctions is used under sunlight with the intensity of 1000 Wm2. The solar cell has an

A multijunction solar cell with more than three junctions is used under sunlight with the intensity of 1000 Wm2. The solar cell has an area of 0.1 m and an efficiency of 21.9 %. The sunlight is modelled as a light source that rises and sets at 6:00 and 18:00, respectively. At noon (12:00 pm), the sunlight is incident normal to the cell. (a) Explain why the efficiency of a multijunction solar cell can be improved by increasing the number of junctions. (5 marks) (b) Present the output power of the solar cell as a function of time between 6:00 and 18:00. (5 marks) (c) Calculate the total energy output in units of watt-hours in one day. (5 marks)

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