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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 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 ) Answer? 2). What is the photon flux of the solar simulator (in 1021m−2s−1)? Answer? 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? Answer? 4).What is the band gap (in eV) of the absorber layer of the junction A? Answer? 5). Calculate the short-circuit current density Jsc of junction A (in mA/cm2) if the solar cell is measured under the solar simulator. Answer? 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. Answer?

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