Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 12, Pages 9827-9832Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee23294d
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Funding
- Center for Interface Science: Solar Electric Materials, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001084]
- STC Program of the National Science Foundation [DMR-0120967]
- Office of Naval Research [N00014-04-1-0313]
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We report on inverted polymer tandem solar cells wherein the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), modified at one interface with ethoxylated polyethylenimine (PEIE), acts as an efficient charge recombination layer. This recombination layer shows very low optical absorption, high electrical conductivity, and a large work function contrast of 1.3 eV between its top and bottom interfaces. Its use yields tandem cells in which the open-circuit voltage is the sum of that of individual cells. The fill factor of tandem cells connected in series is found to be larger than that of single-junction cells. Its simple polymeric composition and its unprecedented performance make it a promising component for emerging organic photovoltaic technologies.
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