In photovoltaic solar cell characterization, the Fill Factor ($ \text{FF} $) is defined as the ratio of: · Electronics MDCAT Past Paper MCQ

Physics Electronics PMDC Conceptual Practice

PMDC Verified Question 284 of 494

In photovoltaic solar cell characterization, the Fill Factor ($ \text{FF} $) is defined as the ratio of:

Maximum output power point ($ P_{\text{max}} = V_m I_m $) to the product of open-circuit voltage and short-circuit current ($ V_{\text{oc}} I_{\text{sc}} $)

Total solar irradiance input to the DC electrical power output

Short-circuit current to the reverse saturation dark current

Open-circuit voltage to the semiconductor band gap

Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:

Option A: Maximum output power point ($ P_{\text{max}} = V_m I_m $) to the product of open-circuit voltage and short-circuit current ($ V_{\text{oc}} I_{\text{sc}} $)

Concept:

The Fill Factor ($ \text{FF} $) measures the 'squareness' of a solar cell's I-V curve, representing the ratio of maximum achievable power ($ V_{\text{mp}} I_{\text{mp}} $) to the theoretical upper limit product ($ V_{\text{oc}} I_{\text{sc}} $).

Formula:

$$\text{FF} = \frac{P_{\text{max}}}{V_{\text{oc}} \cdot I_{\text{sc}}} = \frac{V_{\text{mp}} \cdot I_{\text{mp}}}{V_{\text{oc}} \cdot I_{\text{sc}}} \quad (\text{where } 0.7 < \text{FF} < 0.85 \text{ for high-quality cells})$$

Solution:

$ V_{\text{oc}} $ is the maximum open-circuit voltage at zero current.

$ I_{\text{sc}} $ is the maximum short-circuit current at zero voltage.

The ratio $ \frac{V_{\text{mp}} I_{\text{mp}}}{V_{\text{oc}} I_{\text{sc}}} $ gives the Fill Factor $ \text{FF} $, which directly determines the overall solar cell power conversion efficiency: $ \eta = \frac{\text{FF} \cdot V_{\text{oc}} \cdot I_{\text{sc}}}{P_{\text{in}}} $.

Why other options are incorrect:

Option B: The ratio of DC electrical output to solar irradiance input defines the power conversion efficiency $ \eta $, not the Fill Factor.
Option C: $ I_{\text{sc}} / I_0 $ relates to internal illumination gain, not the Fill Factor.
Option D: $ V_{\text{oc}} / E_g $ is the voltage extraction fraction.

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