Panchal, A and Behera, SK and Nath, B and Ramamurthy, PC (2022) Influence of thin-film processing on the performance of organic field-effect transistors. In: Journal of Applied Physics, 132 (5).
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Abstract
Due to their functional and processing versatility, organic semiconductors have gained much interest in recent years. Tailoring the charge transport in a polymeric semiconductor system is imperative for developing optimized devices. Factors such as selection of solvent species and annealing temperature play a significant role in deciding the morphology of the polymer semiconductor and hence the device performance. Bottom-gate bottom-contact organic field-effect transistors were fabricated with regioregular poly(3-hexylthiophene) (P3HT) as the active material. The effects of using chlorobenzene and o-dichlorobenzene as the solvents for P3HT and annealing temperatures on the device performance were evaluated. The devices made using chlorobenzene showed greater field-effect mobility compared to those fabricated with o-dichlorobenzene. This behavior can be attributed to the disentanglement of polymer chains in a solvent with better matching solubility parameters and subsequent ease of arranging in ordered structures during processing. Furthermore, annealing the o-dichlorobenzene devices at temperatures closer to the crystallization temperature of P3HT showed an increase in field-effect mobility. At temperatures closer to the crystallization temperature, a polymer film in a semidry state can allow increased ordering of the chains leading to enhanced charge transportation.
| Item Type: | Journal Article |
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| Publication: | Journal of Applied Physics |
| Publisher: | American Institute of Physics Inc. |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Annealing; Morphology; Polymer films; Semiconducting films; Solvents, Annealing temperatures; Crystallization temperature; Device performance; Field-effect mobilities; O-dichlorobenzene; Organic field-effect transistors; Performance; Poly (3-hexylthiophene); Polymeric semiconductors; Thin-film processing, Organic field effect transistors |
| Department/Centre: | Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 30 Aug 2022 05:40 |
| Last Modified: | 30 Aug 2022 05:40 |
| URI: | https://eprints.iisc.ac.in/id/eprint/76269 |
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