Bimolecular recombination in ambipolar organic field effect transistors
article
In ambipolar organic field effect transistors (OFET) the shape of the channel potential is intimately related to the recombination zone width W, and hence to the electron–hole recombination strength. Experimentally, the recombination profile can be assessed by scanning Kelvin probe microscopy (SKPM). However, surface potentials as measured by
SKPM are distorted due to spurious capacitive couplings. Here, we present a (de)convolution method with an experimentally calibrated transfer function to reconstruct the actual
surface potential from a measured SKPM response and vice versa. Using this scheme, we find W = 0.5 lm for a nickel dithiolene OFET, which translates into a recombination rate that is two orders of magnitude below the value expected for Langevin recombination.
SKPM are distorted due to spurious capacitive couplings. Here, we present a (de)convolution method with an experimentally calibrated transfer function to reconstruct the actual
surface potential from a measured SKPM response and vice versa. Using this scheme, we find W = 0.5 lm for a nickel dithiolene OFET, which translates into a recombination rate that is two orders of magnitude below the value expected for Langevin recombination.
Topics
TNO Identifier
441429
Source
Organic Electronics, pp. 994-997.
Pages
994-997
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