Organic materials with simple and low-temperature process and is easy to produce superior advantage

Organic materials with simple and low-temperature process and is easy to produce superior advantages in flexible substrate. As to the organic semiconductor acceleration used in the various types of electronic components, to know the best carrier acceleration transmission characteristics and organic semiconductors is very important. Judging from the viewpoint of an inorganic material, generally considered to have better crystal quality, and large areas of the organic thin-film crystal, have higher carrier transport efficiency. However, since the organic thin film has a complicated microstructure, just from the crystal quality and surface morphology of the film, it is difficult to carrier transporting property of the organic semiconductor is clearly explained. acceleration In the present study, we molecules from microscopic point of view, studies to sixteen fluoro copper phthalocyanine acceleration (fluorinated copper-phthalocyanine, F 16 CuPc) as an electron transport characteristics of the organic thin film transistor acceleration active layer. Raman spectroscopy, from electronics - Opinion molecular vibration coupling and molecular arrangement, acceleration analyze the relevance of F 16 CuPc molecular acceleration properties within the film and the electron transport properties. F 16 CuPc electrical output and conversion curve organic thin film transistor, respectively, as shown in Figure 1 (a) and 1 (b) below. Compared to other substrate temperature, when the substrate temperature is 120 C, member has better electrical characteristics, including a large output current, larger than the switch, and smaller sub-threshold voltage. Saturated zone field effect carrier mobility of the substrate temperature is plotted in Fig. 1 (c) in Fig. We found that the saturated zone field effect carrier mobility as the substrate temperature increases, reaching a maximum acceleration when the substrate temperature is 120 C. Figure 2 is F 16 CuPc film grown at a substrate temperature of different Raman spectra. By density functional theory, there are 14 kinds can calculate the full symmetric A 1g molecular vibrational modes with the electronic transmission of F 16 CuPc concerned. In particular, we focus on the contribution of many organizations to re several molecular acceleration vibrational modes. First, this is 953 cm -1 band, and other substrate temperature compared to growth acceleration at a substrate temperature of 30 C film considerably FWHM. FWHM larger display unevenness degree of the film is increased, this can provide a reasonable explanation for the poor electron transport properties. Followed by the 1197 cm -1 band, the band obtained in this experiment corresponds to the theoretical acceleration calculation of the frequency band belonging to B 2g symmetric vibration mode of the molecule 1235 cm -1, in this band, grown at a substrate temperature of 120 C film has minimum FWHM, and growth at a substrate temperature of 30 C film width at half maximum. Since this frequency band and can not contribute to further tissue, acceleration smaller acceleration than the FWHM recommended excellent micro structural properties of the film, it can be reasonably explained growth substrate temperature at 120 C film having the highest electron mobility. acceleration In addition, the strongest band 1540 cm -1, and the saturation region FWHM field-effect carrier mobility of this band has a very significant linear relationship, as shown in Figure 3 (a) in Fig. Re-organization of molecules acceleration can contribute to the re-organization is the sum of all the energy of the molecular vibration mode, so if its contribution to the re-organization can be multiplied by the percentage of FWHM and then added on to the analysis would be more useful. 3 (b), the effect of the saturated zone field carrier mobility acceleration and the FWHM of the sum of a good relationship is shown. Smaller FWHM an electron in the process of transmission, less energy losses in the vibration of the molecule, thereby facilitating the electron transport. Obviously, according to semi-classical theory of electron transfer, can contribute more through analysis of molecular vibrational modes can organize the A 1g symmetry, for efficient electron transport characteristics are a direct and reasonable explanation. In the present study, we get F 16 CuPc Raman spectroscopy according to the theoretical density functional theory, and the molecule calculated for each vibration mode can be contributed by another organization, to study the different growth conditions F 16 CuPc electron transport properties of thin film. We found experiments and theoretical calculations acceleration resulting Raman spectrum fairly consistent, which represents the force within the film F 16 CuPc molecules quite weak. Consider F 16 CuPc electron transport in organic thin film transistors in, our findings show that the contribution of higher electron mobility and energy re-organization of the FWHM of the Raman bands have significant relevance. Furthermore, some B g molecular vibration mode having a small FWHM of symmetry acceleration indicates the direction along the active layer in the channel quality better microstructure. These findings have for the design of effective molecular acceleration semiconductor acceleration carrier transport acceleration properties of, provides an important inspiration.
Figure 2. F 16 CuPc film grown at different substrate temperatures obtained acceleration Raman spectra (excitation wavelength 633 nm) :( a) 30 C; (b) 60 C; (c) 90 C; (d) 120 C; (e) 150 C. (Ar) is F 16 CuPc film grown in the Raman spectra of FIG. 30 C substrate (excitation wavelength 532 nm). A 1g, B 1g, and B 2g symmetric vibration mode of the molecule, and the selected frequency band FWHM are shown in the figure. Dashed line for guidance. Note: These are the strength of the strongest spectral band (1540 cm -1) for as normalization.