High Electron Mobility in [1]Benzothieno[3,2- b][1]benzothiophene-Based Field-Effect Transistors: Toward n-Type BTBTs
- Authors
- Usta, Hakan; Kim, Dojeon; Ozdemir, Resul; Zorlu, Yunus; Kim, Sanghyo; Ruiz Delgado, M. Carmen; Harbuzaru, Alexandra; Kim, Seonhyoung; Demirel, Gökhan; Hong, Jongin; Ha, Young-Geun; Cho, Kilwon; Facchetti, Antonio; Kim, Myung-Gil
- Issue Date
- Jul-2019
- Publisher
- American Chemical Society
- Citation
- Chemistry of Materials, v.31, no.14, pp 5254 - 5263
- Pages
- 10
- Journal Title
- Chemistry of Materials
- Volume
- 31
- Number
- 14
- Start Page
- 5254
- End Page
- 5263
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/33067
- DOI
- 10.1021/acs.chemmater.9b01614
- ISSN
- 0897-4756
1520-5002
- Abstract
- The first example of an n-type [1]benzothieno[3,2-b][1]benzothiophene (BTBT)-based semiconductor, D(PhFCO)-BTBT, has been realized via a two-step transition-metal-free process without using chromatographic purification. Physicochemical and optoelectronic characterizations of the new semiconductor were performed in detail, and the crystal structure was accessed. The new molecule exhibits a large optical band gap (∼2.9 eV) and highly stabilized (ΔELUMO = 1.54 eV)/π-delocalized lowest unoccupied molecular orbital (LUMO) mainly comprising the BTBT π-core and in-plane carbonyl units. The effect of out-of-plane twisted (64°) pentafluorophenyl groups on LUMO stabilization is found to be minimal. Polycrystalline D(PhFCO)-BTBT thin films prepared by physical vapor deposition exhibited large grains (∼2-5 μm sizes) and layer-by-layer stacked edge-on oriented molecules with an in-plane herringbone packing (intermolecular distances ∼3.25-3.46 Å) to favor two-dimensional (2D) source-to-drain (S → D) charge transport. The corresponding TC/BG-OFET devices demonstrated high electron mobilities of up to ∼0.6 cm2/V·s and Ion/Ioff ratios over 107-108. These results demonstrate that the large band gap BTBT π-core is a promising candidate for high-mobility n-type organic semiconductors and, combination of very large intrinsic charge transport capabilities and optical transparency, may open a new perspective for next-generation unconventional (opto)electronics. © Copyright 2019 American Chemical Society.
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