Lecture 4

What is the impurity level of the n-type semiconductor in the band gap?

• Donor

• Acceptor

• It has no impurity levels

Specify the parameters of solar cells

• Short circuit current

• Filling factor

• External quantum efficiency

• PL quantum yield

What are the benefits of the first generation of solar cells?

• Flexible solar cells

• High mobility of charge carries

• High efficiency

• Low cost

What materials are used in the second generation of solar cells?

• Amorphous silicon

• Semiconductors such as CdTe

• Copper indium sulfide

• Monocrystalline silicon

What losses in solar cells are significant (>10%)?

• high energy photons convert to heat

• carrier recombination

• reflection

What is not the third generation of solar cells?

• Electrochemical cells

• Polymer cells

• Tandem cells

• Hybrid Solar Cells Conjugated Polymer - QD

What is not the benefit of bulk heterojunction organic solar cells ?

• Lightweight

• Affordable

• Inexpensive to manufacture

• High efficiency (25%)

What is not a disadvantage of polymer cells ?

• High cost

• Highly susceptible to degradation

• Large band gap

The efficiency of first generation solar cells is ...

• 25%

• 5%

• 50%

• 7.5%

Theoretical efficiency limit for a single cell element is ...

• 31%

• 75%

• 25%

• 61%