Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T02:39:15.837Z Has data issue: false hasContentIssue false
  • English
  • Français

Titanyl Phthalocyanine (TiOPc) Organic Thin Film Transistors With Highly π-π Interaction

Published online by Cambridge University Press:  01 February 2011

Huang-Ming Philip Chen ,
Yung-Hsing Chen  and
Bo-Ruei Lin
Huang-Ming Philip Chen
Affiliation:
[email protected]
Yung-Hsing Chen
Affiliation:
[email protected], National Chiao Tung University, Department of Photonics & Display Institute, Hsinchu, Taiwan, Province of China
Bo-Ruei Lin
Affiliation:
[email protected], National Chiao Tung University, Department of Photonics & Display Institute, Hsinchu, Taiwan, Province of China
Get access

Abstract

The objective of this research is to obtain uniform vacuum-deposition triclinic phase II crystal of titanyl phthalocyanine (α-TiOPc) films from various TiOPc crystal forms. The crystal structure and morphology of vacuum-deposited TiOPc films can be manipulated by deposition rate and substrate temperature. Crystal structure was determined by X-ray diffraction (XRD). Thin film morphology was analyzed by scanning electron microscope (SEM). Highly ordered α-TiOPc film with an edge-on molecular orientation was deposited on octadecyltrichlorosilane (OTS) treated Si/SiO2 surface. All TiOPc crystal forms, such as amorphous, α and γ phases, provided the triclinic phase II crystal of TiOPc. The full width at half maximum (FWHM) of the peak at 7.5 degree in XRD spectra was 0.23, 0.27 and 0.29 for γ, α and amorphous powder when substrate temperature maintained at 180°C, respectively. The FWHM of the 7.5 degree peak can be achieved 0.22 deposited from all crystal forms at elevated temperature higher than 220°C. The α-TiOPc deposition film exhibited an excellent p-type semiconducting behavior in air with dense packing structure due to the close π–π molecular packing. The devices, field-effect mobility range from 0.02 to 0.26 cm2/V s depending on various process parameters. The on/off current ratio (Ion/Ioff) is over 105. The TiOPc OTFTs will be applied as multi-parameter gas sensor in the near future.

Keywords

x-ray diffraction (XRD)thin filmelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1270: Symposia GG/HH/II – Organic Photovoltaics and Related Electronics-From Excitons to Devices , 2010 , 1270-II06-46
Copyright
Copyright © Materials Research Society 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Dimitrakopoulos, C. D., and Malenfant, P. R. L., Organic thin film transistors for large area electronics, Adv. Mater., 14, 99–117 (2002).Google Scholar
2 Bao, Z., Lovinger, A. J., and Dodabalapur, A., Organic field-effect transistors with high mobility based on copper Phthalocyanine, Appl. Phys. Lett., 69, 3066–3068 (1996).Google Scholar
3 Li, L., Tang, Q., Li, H., Hu, W., Yang, X., Shuai, Z., Liu, Y., and Zhu, D. Organic thin-film transistors of phthalocyanines, Pure Appl. Chem., 80, 2231–2240 (2008).Google Scholar
4 Tsumura, A., Koezuka, H., and Ando, T., Macromolecular electronic device: field-effect transistor with a polythiophene thin fim, Appl. Phys. Lett., 49, 1210–1212 (1986).Google Scholar
5 Clarisse, C., Riou, M. T., Gauneau, M., and Contellec, M. L., Field-effect transistor with diphthalocyanine thin film, Electron. Lett., 24, 674–675 (1988).Google Scholar
6 Tada, H., Touda, H., Takada, M., and Matsushige, K., Quasi-intrinsic semiconducting state of titanyl-phthalocyanine films obtained under ultrahigh vacuum conditions, Appl. Phys. Lett., 76, 873–875 (2000).Google Scholar
7 Li, L., Tang, Q., Li, H., Yang, X., Hu, W., Song, Y., Shuai, Z., Xu, W., Liu, Y., and Zhu, D., An ultra closely -stacked organic semiconductor for high performance field-effect transistors, Adv. Mater., 19, 2613–2617 (2007).Google Scholar
8 Mizuguchi, J., Rihs, G., and Karfunkel, H. R., Solid-state Spectra of Titanylphthalocyanine as Viewed from Molecular Distortion, J. Phys. Chem., 99, 16217–16227 (1995).Google Scholar