Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6534934 | Solar Energy Materials and Solar Cells | 2016 | 7 Pages |
Abstract
We have used impedance spectroscopy technique to monitor degradation mechanisms in organic solar cells based on a blend of PTB7:PC71BM. We have measured the impedance of the cell on a periodical basis for almost four months, and experimental data have been modeled using three different circuits. The evolution of the circuital parameters gives information about the device dynamical mechanisms. We have observed at high voltages a low frequency feature that is more pronounced along days of measurement. This low frequency arc has been associated to charge accumulation that is related to a worsening of charge extraction through the contacts. The simultaneous increase of recombination and low frequency resistances at high voltages (around Voc) results in a decrease of the fill factor and therefore of the efficiency.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
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Authors
Belén Arredondo, MarÃa B. MartÃn-López, Beatriz Romero, Ricardo Vergaz, Pablo Romero-Gomez, Jordi Martorell,