20.500.12556/RUNG-3921-d57bbada-1079-4c3d-7472-bf7227c6f241
Negative field‐dependent charge mobility in crystalline organic semiconductors with delocalized transport
Charge-carrier mobility has been investigated by time-of-flight (TOF) transient photocurrent in a lateral transport con- figuration in highly crystalline thin films of 2,7-dioctyl[1]benzothieno [3,2-b][1] benzothiophene (C8-BTBT) grown by a zone-casting alignment technique. High TOF mobility has been revealed that it is consistent with the delocalized nature of the charge transport in this material, yet it featured a positive temperature dependence at T ≥ 295 K. Moreover, the mobility was surprisingly found to decrease with electric field in the high-temperature region. These observations are not compat- ible with the conventional band-transport mechanism. We have elaborated an analytic model based on effective-medium approximation to rationalize the puzzling findings. The model considers the delocalized charge transport within the energy landscape formed by long-range transport band-edge variations in imperfect organic crystalline materials and accounts for the field-dependent effective dimensionality of charge transport percolative paths. The results of the model calculations are found to be in good agreement with experimental data.
time of flight
organic semiconductors
single crystals
true
true
false
Angleški jezik
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2018-05-07 09:17:53
2018-05-07 10:34:08
2023-06-13 14:24:50
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2018
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2018
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5147899
URN:SI:UNG:REP:CC4S2MA2
Univerza v Novi Gorici
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