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A new time-resolved methodology for extraction of the slow carrier (electron) mobility in OLED devices operating in photocell mode

We present an analytic description for the loss of photocurrent efficiency at moderate light intensities and demonstrate a simple technique for extracting the mobility of electrons in semiconducting polymer layers. The underlying theoretical analysis, which is based on a simple drift-recombination scheme, shows good agreement with the measured intensity dependent photocurrent quantum efficiency over 5 orders of magnitude in intensity. The electron mobility extraction is demonstrated for pristine MEH-PPV. We use the combination of theoretical and experimental study to discuss the role of recombination and space charge effects in reducing photocurrent efficiency. We apply the analytical results to device design criteria and deduce that the minimum, low field, mobility value of the slow carrier required to achieve close to ideal fill- factor is 10-2cm2v-1s-1

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