Question 1: 4 pts What kind of losses are related to the design of the top conta

Question

Question 1: 4 pts What kind of losses are related to the design of the top contact of a solar cell? (a) Shading losses. (b) Resistive losses in the top contact. (c) Resistive losses in the emitter. (d) All of the above Choose one answer and justify your choice. Question 2: 4 pts Which of the following statements is false g the length of the finger increases the resistive losses. (b) Increasing the finger spacing decreases the power losses due to shadowing (c) Increasing the finger width increases the power losses due to shadowing. (d) Increasing the finger width increases the resistive losses. Choose one answer and justify your choice. Question 3: 2 pts Consider a c-Si (crystalline) solar cell with fingers having a resistance of R-0.10 What would be the finger resistance if the finger width was doubled and the finger height was set to one third of its initial value?

Explanation / Answer

1) The design of the top contact of a solar cell minimizes finger and busbar resistance, this also leads to the overall reduction of losses associated with the top contact. These include resistive losses in the emitter, resistive losses in the metal top contact and shading losses. The correct option is d.

2) Statement d is false. Resistance is inversely proportional to finger width hence an increase in finger width decreases the resistive losses.

3) Finger resistance is poportional to finger width and finger height in the following way,

R ? 1/(wfdf) ? R = k/(wfdf) here k is a constant

wf is the finger width, df is the finger height

Now the finger width is doubled and finger height was set to one third of its initial value

R' = 3k/(2wfdf)   ? R' = 3R/2 = (3*0.1)/2 = 0.15 ?

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