Chapter 8 LO13

Question 1

Discuss the advantages of monocrystalline Solar PV cells

Answer 1

Advantages

1. Lack of boundaries results in minimal resistance and so higher efficiencies.
2. Distinctive from polycrystalline cells due to their uniform appearance of dark blue or black colour.
3. They are a tried and tested technology capable of delivering electricity effectively.
4. 25 Year warranty typically.
5. Market Modules = 22% Efficiency

Question 2

Discuss the disadvantages of monocrystalline Solar PV cells

Answer 2

1. Time consuming manufacturing process.
2. Most expensive solar cell available to customers for domestic use.
3. Requires regular maintenance.

Question 3

Discuss the advantages of polycrystalline Solar PV cells

Answer 3

1. Less time consuming manufacturing process than mono-crystalline cells.
2. Typical 25 Year Warranty.
3. Cheaper than mono-crystalline.

Question 4

Discuss the disadvantages of polycrystalline Solar PV cells

Answer 4

1. Has an increased number of grade boundaries therefore increases the resistance of the cell.
2. Reduced efficiency compared to mono-crystalline typically 11-20%

Question 5

Explain the reason for the differing efficiencies of monocrystalline and polycrystalline Solar PV cells.

Answer 5

Monocrystalline cells are manufactured from a single, continuous silicon crystalline structure with no boundaries. The lack of boundaries is highly advantageous as boundaries can cause electrons and holes to resemble at these points and as a result the resistance increases. The lack of boundaries results in minimal resistance and so higher efficiencies.

Question 6

If a domestic user has a limited roof area available for installing solar PV cells, which type of solar cell is the most advisable? Explain your reasoning.

Answer 6

Monocrystalline cells as it has a better aesthetic appearance and better energy efficiency than polycrystalline cells.

Question 7

What are the advantages of thin cells compared to either Monocrystalline or polycrystalline solar cells.

Answer 7

Efficiencies do not alter considerably at higher temperatures compared to mono + poly cells do drop efficiency at higher temperatures. They can also be applied to curved surfaces, and can be manufactured to the transparent and so can be used in passive solar technologies.

Question 8

Name 2 other materials types of PV modules

Answer 8

Thick - Film PV modules
Thin - Film PV modules