Study on aggregation and electric properties in the micro-region of functionalized dithieno[2, 3-b: 3′, 2′-d]thiophene (DTT) oligomers

Journal Article · Fri Jul 15 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4959892· OSTI ID:22611448

Jiang, Xiaohong; Huang, Xiaowei; Zhang, Jiajia; Lu, Zhijuan; Wang, Hua; Du, Zuliang ^[1]

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1. Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004 (China)

Three kinds of 2,5,-diphenyl-dithienol[2, 3-b: 3′, 2′-d]thiophene (DP-DTT), 2,5,-distyryl-dithienol[2, 3-b: 3′, 2′-d]thiophene (DEP-DTT) and 2,5,-thienyl-dithienol[2, 3-b: 3′, 2′-d]thiophene (DET-DTT) micro-region structure and electronic properties were studied. Thin films of these functionalized DTT oligomers were prepared in a one-step drop-casting deposition onto highly oriented pyrolytic graphite substrates. The surface structure of these films was characterized by atomic force microscopy (AFM). Conducting probe atomic force microscope (C-AFM) and Kelvin probe force microscope (KFM) were both used to characterize the electronic transport behavior and surface potential distribution. The substituents of DTT oligomers can greatly affect their aggregation and the hopping conductance mechanism was used to explain the Au-DTTs-HOPG junctions. KFM investigation revealed that these oligomers with different substituents have different highest occupied molecular orbital energy levels. The corresponding theoretical analysis reveals similar result to KFM characterization. The I-V results indicated that the aggregates of molecules were the dominating factor to their micro-region electrical transport.

• OSTI ID: 22611448
• Journal Information: AIP Advances, Vol. 6, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AGGLOMERATION
ATOMIC FORCE MICROSCOPY
DEPOSITION
DISTRIBUTION
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL PROPERTIES
ENERGY LEVELS
MICROSCOPES
MOLECULAR ORBITAL METHOD
ORGANIC COMPOUNDS
POLYCYCLIC SULFUR HETEROCYCLES
SEMICONDUCTOR JUNCTIONS
SUBSTRATES
SURFACE POTENTIAL
SURFACES
THIN FILMS
THIOPHENE