Small band gap and multijunction polymer solar cells

R.A.J. Janssen, J. Gilot, M.M. Wienk, M.G.R. Turbiez

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Solar cells based on a new conjugated donor polymer with alternating quaterthiophene and diketo pyrrolo-pyrrole units in combination with C60 and C70 PCBM acceptors will be presented. The new material affords high external quantum efficiencies (EQE >40%) over a broad spectral range from the UV up to the near IR. The new materials provide power conversion efficiencies of 3.2 and 4.0%, resp., under AM1.5G solar light conditions. The new small band gap polymer is further used in soln. processed multi-junction solar cells. These multi-junction devices combine spin coated electron and hole transporting layers that allow efficient recombination of charges generated in adjacent cells. Tandem cells that can be prepd. in this way offer the possibility to utilize the photon energy more efficiently by combining sub cells with different band gaps. Efficient tandem cell devices based on combinations of efficient wide and small band gap polymer:fullerene cells will be presented. Modeling of the optical absorption and anal. of the EQE will be compared to elucidate the scope and limitations of polymer tandems cells. [on SciFinder (R)]
Originele taal-2Engels
TitelAbstracts of Papers, 236th ACS National Meeting, Philadelphia, PA, United States, August 17-21, 2008
Pagina'sPMSE-155
StatusGepubliceerd - 2008

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Janssen, R. A. J., Gilot, J., Wienk, M. M., & Turbiez, M. G. R. (2008). Small band gap and multijunction polymer solar cells. In Abstracts of Papers, 236th ACS National Meeting, Philadelphia, PA, United States, August 17-21, 2008 (blz. PMSE-155)