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Issue 42, 2012
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Multijunction organic photovoltaics with a broad spectral response

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We demonstrate series-integrated multijunction organic photovoltaics fabricated monolithically by vapor-deposition in a transposed subcell order with the near-infrared-absorbing subcell in front of the green-absorbing subcell. This transposed subcell order is enabled by the highly complementary absorption spectra of a near-infrared-absorbing visibly-transparent subcell and a visible-absorbing subcell and motivated by the non-spatially-uniform optical intensity in nanoscale photovoltaics. The subcell order and thicknesses are optimized via transfer-matrix formalism and short-circuit current simulations. An efficient charge recombination zone consisting of layers of BCP/Ag/MoOx leads to negligible voltage and series-resistance losses. Under 1-sun illumination the multijunction solar cells exhibit a power conversion efficiency of 5.5 ± 0.2% with an FF of 0.685 ± 0.002 and a VOC of 1.65 ± 0.02 V, corresponding to the sum of the VOC of the component subcells. These devices exhibit a broad spectral response (in the wavelength range of 350 nm to 850 nm) but are limited by subcell external quantum efficiencies between 20% and 30% over the photoactive spectrum.

Graphical abstract: Multijunction organic photovoltaics with a broad spectral response

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The article was received on 28 Aug 2012, accepted on 28 Aug 2012 and first published on 29 Aug 2012

Article type: Paper
DOI: 10.1039/C2CP43000B
Phys. Chem. Chem. Phys., 2012,14, 14548-14553

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    Multijunction organic photovoltaics with a broad spectral response

    J. A. Macko, R. R. Lunt, T. P. Osedach, P. R. Brown, M. C. Barr, K. K. Gleason and V. Bulovic, Phys. Chem. Chem. Phys., 2012, 14, 14548
    DOI: 10.1039/C2CP43000B

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