2002
DOI: 10.1103/physrevlett.89.227403
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Picosecond Transient Photoconductivity in Functionalized Pentacene Molecular Crystals Probed by Terahertz Pulse Spectroscopy

Abstract: We have measured transient photoconductivity in functionalized pentacene molecular crystals using ultrafast optical pump-terahertz probe techniques. The single crystal samples were excited using 800 nm, 100 fs pulses, and the change in transmission of time-delayed, subpicosecond terahertz pulses was used to probe the photoconducting state over a temperature range from 10 to 300 K. A subpicosecond rise in photoconductivity is observed, suggesting that mobile carriers are a primary photoexcitation. At times long… Show more

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Cited by 110 publications
(128 citation statements)
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“…9,10 The similar trend observed in all crystals studied here ͑inset of Fig. 1͒ suggests that subpicosecond photogeneration of free carriers, [7][8][9][10]16 and not only of excitons, 3 in the absence of a static electric field is an intrinsic property of oligoacenes.…”
supporting
confidence: 54%
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“…9,10 The similar trend observed in all crystals studied here ͑inset of Fig. 1͒ suggests that subpicosecond photogeneration of free carriers, [7][8][9][10]16 and not only of excitons, 3 in the absence of a static electric field is an intrinsic property of oligoacenes.…”
supporting
confidence: 54%
“…1 shows the onset of the photoresponse, normalized to its maximum value at ⌬t =0, and reveals a fast ͑Ͻ400 fs rise time limited by the time resolution of our setup͒ carrier photogeneration process in all crystals. Subpicosecond charge photogeneration has been previously observed in FPc and Pc single crystals 7,8 and thin films. 9,10 The similar trend observed in all crystals studied here ͑inset of Fig.…”
mentioning
confidence: 96%
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