AQ4.1.1 MICROMORPH MODULE

 

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Consider a small module based on interconnected tandem cells of hydrogenated amorphous and microcrystalline silicon as depicted in the figure below. The Voc of a single tandem cell is 1.35V and the short-circuit density Jsc is 12mA/cm2.

 

Which combination of the external parameters can reflect the external parameters of the module depicted in the figure above?

AQ4.2.1 CIGS AND CDTE FABRICATION

During manufacturing of a CIGS device, the metal back contact is deposited first, while in case of the CdTe solar cells, the back contact is deposited in the last processing step. What are the configurations of both cells:

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Both the CI(G)S and CdTe solar cells are made in superstrate stucture.

The CI(G)S solar cell is made in a superstrate structure, whereas CdTe solar cell is made in a substrate structure.

The CI(G)S solar cell is made in a substrate structure, whereas CdTe solar cell is made in a superstrate structure.

Both CI(G)S and CdTe solar cells are made in substrate stucture.

4.3.1 TRIPLE JUNCTION J-V CURVE

On the left-hand side of the figure below a III-V triple junction solar cell is shown. On the right-hand side, the J-V curves of the individual component cells and the multi-junction solar cell are shown.

Which junction corresponds to sub cell 3?

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Sub cell based on Ge. Sub cell based on GaAs. Sub cell based on GaInP. Sub cell based on GaInAs.

CELL

 

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Solar simulators are used to study the performance of solar cells in the lab. In the figure below (left picture), the spectral power density of a solar simulator is shown with the blue line. The spectral power density of this solar simulator is given by:

P(λ)=7.5∗1015λ−2.25∗109 [Wm−2m−1] for 300nm<λ<500nm

P(λ)=2.25∗109−1.5∗1015λ [Wm−2m−1] for 500nm<λ<1500nm

Where the wavelength λ is expressed in meters.

Calculate the irradiation I of the solar simulator (in Wm−2 )

4.4.2 EXTERNAL QUANTUM EFFICIENCY OF A TANDEM CELL

 

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What is the photon flux of the solar simulator (in 1021m−2s−1)?

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4.4.3 EXTERNAL QUANTUM EFFICIENCY OF A TANDEM CELL

 

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The EQE of a tandem cell with junction A and junction B under short-circuited (V = 0 V) condition is also presented in the previous figure (right picture).

4.4.4 EXTERNAL QUANTUM EFFICIENCY OF A TANDEM CELL

 

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What is the band gap (in eV) of the absorber layer of the junction A?

4.4.5 EXTERNAL QUANTUM EFFICIENCY OF A TANDEM CELL

 

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Calculate the short-circuit current density Jsc of junction A (in mA/cm2) if the solar cell is measured under the solar simulator.

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4.4.6 EXTERNAL QUANTUM EFFICIENCY OF A TANDEM CELL

 

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Junction B has a different absorber layer than junction A. Above its band gap, the solar cell B has an EQE = 0.60 that remains constant. Calculate the short-circuit current density Jsc of the junction B (in mA/cm2) if the solar cell is measured under the solar simulator.

AQ4.5.1 DYE-SENSITIZED SOLAR CELL

 

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Consider an organic solar cell consisting of a TiO2 semiconductor with an ionization energy of 7.8eV and a polymer with an electron affinity of 3.4eV. Which of the following band diagrams corresponds to the organic solar cell? The band gap of TiO2 is 3.5eV.

AQ4.5.2 DYE-SENSITIZED SOLAR CELL

 

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What is the driving force (in eV) for electron injection from the polymer to the semiconductor?

AQ4.5.3 DYE-SENSITIZED SOLAR CELL

 

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The electron diffusion coefficient is De=4∗10−5cm2/s and the thickness of TiO2 is 4μm. What is the lifetime of the injected electrons (in ms)?

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