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The earth's atmosphere absorbs a considerable amount of the ultraviolet light. The resulting spectrum at the Earth's surface has fewer photons, but they are of lower energy on average, so the number of photons, above the bandgap, per unit of sunlight energy is greater than in space. This means that solar cells are more efficient at AM1 than AM0.
John Pierpont Morgan Sr. (April 17, 1837 – March 31, 1913) [1] was an American financier and investment banker who dominated corporate finance on Wall Street throughout the Gilded Age and Progressive Era.