Question

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

1). Where the wavelength λ is expressed in meters.
Answer? I= \frac{200*10^{-9}*1.5*10^{9}}
{2}+\frac{1000*10^{-9}*1.5*10^{9}}{2}=900 W/m^2
1.1). Calculate the irradiation I of the solar simulator (in Wm−2 )
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2). What is the photon flux of the solar simulator (in 1021m−2s−1)?
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3). 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). Which junction acts like the top cell in the tandem cell?
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4).What is the band gap (in eV) of the absorber layer of the junction A?
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5). 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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6). 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.
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