Fast Photoresponse of Functionalized Pentacene and Anthradithiophene Thin Films
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1003-O09-22
Fast Photoresponse of Functionalized Pentacene and Anthradithiophene Thin Films Jonathan Day1, Oksana Ostroverkhova1, and John Anthony2 1 Oregon State University, Corvallis, OR, 97331 2 University of Kentucky, Lexington, KY, 40506 ABSTRACT We present photoconductivity of high-performance functionalized pentacene and anthradithiophene thin films on time scales from picoseconds to many seconds after photoexcitation. The polycrystalline thin films were deposited from solution on glass substrates with patterned interdigitated aluminum electrodes. In studies of fast transient photoconductivity, the samples were excited with laser pulses of ~100 fs duration at a wavelength of 400 nm, and the photocurrent due to transport of photoexcited charge carriers was monitored using 50 GHz digital sampling oscilloscope. The photoconductivity at longer (milliseconds through seconds) time scales was investigated using continuous wave (cw) illumination and a source-delaymeasure unit. Both experiments were performed under conditions of varied electric field strength, fluence and temperature. In all samples, we observed fast charge carrier photogeneration (
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