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I think the point you are making is why isn't the n-CdS/p-CdTe junction inverted to be p-CdTe/n-CdS. As you say this would allow the "high mobility" CdTe layer (it's not really high mobility, it more that any carriers generated in CdS recombine instantly) to be placed first and absorb a little extra light. Something on the order of $7mA/cm^2$ of photocurrent ...

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I can't speak directly to this design, but can offer two general reasons for an overlayer. First, it may be necessary to protect or passivate the junction material. Second, a layer of appropriate thickness and index of refraction will reduce the overall reflectance, thus improving the collection efficiency of the device (solar cells are essentially a ...

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Though it is not common to use Fresnel lenses for electricity generation but 100 MW power plant is nearing completion in Rajasthan state of India using linear Fresnel lens technology. So to say that this technology is not feasible for large scale use is not correct and time may come if that above mentioned power generation goes smoothly, the scene may change ...

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