Enhanced efficiency in double junction polymer: Fullerene solar cells
article
Polymer solar cells based on the polyfluorene copolymer poly[9,9-didecanefluorene-alt-(bis-thienylene) benzothiadiazole] (PF10TBT) and the fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester (PCBM) exhibit a power conversion efficiency of 4%. However, the optimum thickness of the photoactive layer is only 80 nm, such that these solar cells absorb only half of the photons available in their absorption bandwidth. Thicker cells are subject to electronic losses due to space charge effects and recombination. We demonstrate both from simulations and experiments that the optical and electronic losses can be decoupled in a double junction solar cell. For the PF10TBT:PCBM blend, the integration of two thin cells in a double junction device leads to an enhancement of the measured power conversion efficiency with 13% up to a value of 4.5%. © 2010 Elsevier B.V. All rights reserved.
Topics
Optoelectronic modelingPF10TBTPolymerSolar cellsTandemBenzothiadiazolesButyric acidsDouble-junction solar cellsEnhanced efficiencyFullerene derivativeJunction devicesMethyl estersOptimum thicknessOptoelectronic modelingPF10TBTPhotoactive layersPolyfluorene copolymerPolymer Solar CellsPower conversion efficienciesSpace charge effectsTandemThin cellsConversion efficiencyEstersFatty acidsFullerenesMultiphoton processesPolymersSolar cells
TNO Identifier
461547
ISSN
15661199
Source
Organic Electronics: physics, materials, applications, 11(11), pp. 1821-1827.
Pages
1821-1827
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