2012
DOI: 10.1063/1.3677934
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The performance of organic electronic ratchets

Abstract: Organic electronic ratchets rectify time-correlated external driving forces, giving output powers that can drive electronic circuitry. In this work their performance characteristics are investigated using numerical modeling and measurements. It is shown how the characteristic parameters of the time-varying asymmetric potential like length scales and amplitude, as well as the density and mobility of the charge carriers in the device influence the performance characteristics. Various ratchet efficiencies and the… Show more

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Cited by 9 publications
(9 citation statements)
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References 14 publications
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“…Previously, it was assumed that there exists a linear relation between the short circuit current I SC and the open circuit voltage V OC of this type of electronic ratchets, in line with what is commonly observed for ratchets . In case the slope of the I–V curve is set by the total channel resistance, which only weakly depends on offset V 0 , contour plots of V OC should strongly resemble those of I SC . Figure b shows this is not the case.…”
Section: Resultssupporting
confidence: 59%
See 2 more Smart Citations
“…Previously, it was assumed that there exists a linear relation between the short circuit current I SC and the open circuit voltage V OC of this type of electronic ratchets, in line with what is commonly observed for ratchets . In case the slope of the I–V curve is set by the total channel resistance, which only weakly depends on offset V 0 , contour plots of V OC should strongly resemble those of I SC . Figure b shows this is not the case.…”
Section: Resultssupporting
confidence: 59%
“…[21,30,31] Consequently, the fill factors are much higher than 1/4, almost reaching 0.7 as shown in the inset. [21,30,31] Consequently, the fill factors are much higher than 1/4, almost reaching 0.7 as shown in the inset.…”
Section: Resultsmentioning
confidence: 94%
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“…Here, we identify two parameters, the shape of the potential and the amount of friction on the electron (defined as the ratio of the potential oscillation timescale to the electron relaxation timescale), that, when explored simultaneously over a large parameter space, reveal two modes of ratchet operation that produce current by two different mechanisms. Prior work that explored the effect of shape on the behavior of the ratchet current focused on variations to a single potential [28][29][30][31][32][33][34]; however, while the current from a ratchet of a single shape does show resonances at certain oscillation frequencies [20], examining the frequency dependence of a single shape does not make apparent the transition from under-damped to over-damped ratcheting mechanisms. Identifying this transition, which is only possible when considering the complete space of biharmonic shapes and a large range of friction values, is critical in uncovering physically intuitive behaviors, and relating these behaviors to structural features of this complex system.…”
Section: Introductionmentioning
confidence: 99%
“…They typically produce low currents and voltages, operate at cryogenic temperatures, and entail complex fabrication procedures . For instance, in 2011, Roeling and co‐workers made an electronic ratchet that provides current approaching 1 μA at room temperature based on asymmetric electric fields that are induced in the organic semiconductor pentacene. However, the complexity of the device architecture, which requires up to 32 gate electrodes, makes commercial application unlikely.…”
mentioning
confidence: 99%