Journal
PHYSICAL REVIEW B
Volume 77, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.125203
Keywords
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Funding
- Engineering and Physical Sciences Research Council [GR/T11630/01, GR/T06568/01, GR/T11623/01] Funding Source: researchfish
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We have used terahertz time- domain spectroscopy to investigate photoinduced charge generation in conjugated polymer field- effect transistors. Our measurements show that excitons dissociate in the accumulation layer under the application of a gate voltage, with a quantum efficiency of similar to 0.1 for an average gate field of similar to 1 X 10(8) Vm(-1). The transistor history is found to affect the exciton dissociation efficiency, which decreases as holes are increasingly trapped in the accumulation layer. The quantum efficiency of charge formation from excitons is compared with the two contrasting models proposed by Onsager and Arkhipov based on the assumption that field- induced exciton dissociation is assisted by the Brownian diffusive motion or an initial excess energy supplied by excited vibrational modes, respectively.
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