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Question

A silicon solar cell has a short-circuit current of 100mA and an open circuit voltage of 0.8V under full solar illumination. The fill factor is given as 0.7, what is the maximum power delivered to a load by the cell?

The correct answer is
56 mW

Solar Cell Maximum Power Calculation

This solution demonstrates calculating the maximum power output of a silicon solar cell given its short-circuit current ($I_{sc}$), open-circuit voltage ($V_{oc}$), and fill factor (FF).

Key Formula

The maximum power ($P_{max}$) delivered by a solar cell is determined by the following formula:

$ P_{max} = V_{oc} \times I_{sc} \times FF $

Input Values

The provided values are:

  • Short-circuit current, $I_{sc} = 100 \text{ mA} = 0.1 \text{ A}$
  • Open-circuit voltage, $V_{oc} = 0.8 \text{ V}$
  • Fill Factor, $FF = 0.7$

Calculation Steps

  1. Substitute the known values into the formula:

    $ P_{max} = (0.8 \text{ V}) \times (0.1 \text{ A}) \times 0.7 $

  2. Calculate the product:

    $ P_{max} = 0.056 \text{ W} $

  3. Convert the power from Watts (W) to milliwatts (mW):

    $ P_{max} = 0.056 \text{ W} \times 1000 \frac{\text{mW}}{\text{W}} = 56 \text{ mW} $

Therefore, the maximum power delivered by the solar cell is 56 mW.

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Important Questions from Semiconductor Materials

  1. Which of the following IS a pentavalent impurity?

  2. A bar of Gallium Arsenide (GaAs) is doped with Silicon such that the Silicon atoms occupy Gallium and Arsenic sites in the GaAs crystal. Which one of the following statements is true?

  3. The outermost orbit of a Germanium atom has ________ electrons.

  4. P-type extrinsic semiconductor doped with impurity having how much valence electron?

  5. All semiconductors in their last orbit have

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