Intermediate band solar cell with extreme broadband spectrum quantum efficiency.
We report, for the first time, about an intermediate band solar cell implemented with InAs/AlGaAs quantum dots whose photoresponse expands from 250 to ∼6000  nm. To our knowledge, this is the broadest quantum efficiency reported to date for a solar cell and demonstrates that the intermediate band solar cell is capable of producing photocurrent when illuminated with photons whose energy equals the energy of the lowest band gap. We show experimental evidence indicating that this result is in agreement with the theory of the intermediate band solar cell, according to which the generation recombination between the intermediate band and the valence band makes this photocurrent detectable.
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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Datas
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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López
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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Ramiro
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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Antolín
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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Martí
Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria s/n, 28040 Madrid, Spain.
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Luque
Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
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Tamaki
Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
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Shoji
Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
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Sogabe
Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
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Okada