Abstract
We develop an analytical model for the photocurrent of organic solar cells based on carrier drift and including second-order charge recombination, in which the figure of merit ${\ensuremath{\theta}}_{o}$ naturally appears. This approach provides expressions for the fill-factor--${\ensuremath{\theta}}_{o}$ and \ensuremath{\alpha}-${\ensuremath{\theta}}_{o}$ relations, where \ensuremath{\alpha} is the exponent of the function of the short-circuit current versus light intensity (${J}_{\mathrm{SC}}$ \ensuremath{\propto} ${I}^{\ensuremath{\alpha}}$). A correlation between the reduction factor of Langevin recombination and the dissociation probability of charge transfer states (P) is also discussed. Photocurrent curves of a polymer device obtained at different temperatures (100--300 K) are fitted by the model, whose fitting parameters are in agreement with the literature.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call