| Title: | Negative field‐dependent charge mobility in crystalline organic semiconductors with delocalized transport |
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| Authors: | ID Tong, Fei (Author)
ID Kadashchuk, Andrey, IMEC (Author)
ID Pavlica, Egon, UNG (Author)
ID Bratina, Gvido, UNG (Author), et al. |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | 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. |
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| Keywords: | time of flight, organic semiconductors, single crystals |
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| Year of publishing: | 2018 |
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| Number of pages: | 12 |
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| Numbering: | 73 |
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| PID: | 20.500.12556/RUNG-3921-d57bbada-1079-4c3d-7472-bf7227c6f241 |
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| COBISS.SI-ID: | 5147899 |
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| NUK URN: | URN:SI:UNG:REP:CC4S2MA2 |
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| Publication date in RUNG: | 07.05.2018 |
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| Views: | 6273 |
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| Downloads: | 0 |
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