Minimizing optical losses in bulk heterojunction polymer solar cells |
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Authors: | AJ Moulé K Meerholz |
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Institution: | 1.Institut für Physikalische Chemie,Universit?t zu K?ln,K?ln,Germany |
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Abstract: | The efficiency that a solar cell can reach is ultimately limited by the number of photons absorbed in its active layer. Bulk
heterojunction polymer solar cells are fabricated from a stack of thin film layers, each of which is thinner than a single
wavelength from an incident photon within its absorption band. One consequence of this thin film layer stack is a strong optical
interference between the various layers that can change the quantity of light dissipated in the active layer by 50%. Here
we use optical modeling to quantitatively calculate the dissipation in each of the various layers as functions of wavelength
and layer thickness. Using this information the loss free short circuit current density can be calculated (Jscmax). Optimization of Jscmax leads to direct improvements in the efficiency of the solar cell through improved light dissipation in the active layer.
The optical properties for a P3HT:PCBM active layer and a model Lorentzian low band gap spectrum are optimized and ideal fabrication
conditions are reported for these materials.
PACS 72.40.+w; 72.80.Le |
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Keywords: | |
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