Emitter Resistance

Source: YouTube

Understanding Emitter Resistance Loss in Solar Cells

When it comes to solar cells, one important factor to consider is the emitter resistance loss. This type of loss can be calculated based on the sheet resistivity and plays a significant role in the efficiency of the solar cell.

Calculating Power Loss

The power loss due to emitter resistance can be determined by analyzing the finger spacing in the top contact of the solar cell. The current flow in the emitter is not constant, as it depends on factors such as the distance to the finger and the location where the current enters the emitter.

The incremental power loss in a specific section can be calculated using the formula:

dP_loss = I^2 * dR

Where dR is the differential resistance, given by dR = ρ/b * dy

Total Power Loss Calculation

The total power loss can be calculated by integrating the current equation over the finger spacing. The equation for total power loss is:

P_loss = ∫(I(y)^2 * dR) = ∫(J^2 * b^2 * y^2 * ρ * dy / b) = J^2 * b * ρ * S^3 / 24

Optimizing Solar Cell Efficiency

To optimize the efficiency of a solar cell, it is essential to minimize power loss in the emitter. By calculating the fractional power loss and determining the minimum spacing for the top contact grid, it is possible to enhance the performance of the solar cell.

For instance, in a typical silicon solar cell with specific parameters, the finger spacing should be less than a certain value to ensure that the power loss in the emitter remains below a certain percentage.

Source: Electronics Stack Exchange

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