Journal
PHYSICAL REVIEW LETTERS
Volume 92, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.92.196601
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We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge photoyields is achieved through subpicosecond studies of both the real and the imaginary components of the complex conductivity over a wide frequency range. Predominantly excitons, with near-unity quantum efficiency, are generated on excitation, while only a very small fraction (< 10(-2)) of free charges are initially excited, consistent with rapid (similar to 100 fs) hot exciton dissociation. These initial charges are very short lived, decaying on subpicosecond time scales.
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