MANIFESTATION OF NANOINTERFACES IN TRANSPORT PROPERTIES OF THE N-PHENYLENES

1. MANIFESTATION OF NANOINTERFACES IN TRANSPORT PROPERTIES OF THE N-PHENYLENES I.V. KITYK, S.W.TKACZYK Institute of Physics, Czestochowa UT , Poland E-mail: iiwank74@gmail.com

2. Main features of the films: • N-phenylene films with different thickness deposited on a glass; • Correlation between the film thickness and sizes of the MC. • Interface sheet of the crystallites and their sizes • Influence of the deposition conditins on the sizes of the NC • Photoinduced operation by the film micro- and nanocrystalline (NC) sizes

3. Basic methods of materials investigations: • Transport measurements of the films using four probe method; • Optically induced treatment of the micro-crystalline and nanocrystalline morphology; • Creation of illumination regimes below and about destruction limit of materials to operate by structural, optical and electronic properties of materials. • X-Ray, UV-visible and non-linear optical monitoring.

4. Goal of investigations: • Photoinduced operation parameters of the phenylene nanocrystallites. • Exploration of contribution of different microcrystallite sizes to the transport properties • Correlation between the macrostructural properties and nanosizes of the film crystallites • Creation of the optically operated nanocrystallites treated by different temperature.

5. Photoinduced crystallization under treatment under power density about 0.2 GW/cm2 at 100 K N=4. N=5. N=6.

6. P-GLASS BK-7 P-SEXIPHENYL/GLASS BK-7 20m GGLALASS BK-7 20 m GLASS KB-7 Phototreatment of p-sexyphenyl/glass BK-7.

7. (a)Morphology of films before illumination (b) Morphology of films after illumination by coherent optical light with power density 0.76 GW/cm2. Typical changes of organic films

8. Fig. 1. General geometry of electrodes and substrates. The diameters of the glasses about 40 mm. The widths of electrodes (upper gold and lower aluminium) – 2 mm; p-sexiphenyl surface 20 mm x 20 mm. Fig. 2. Electronic photography of the p-sexiphenyl/glass substrate. Photoinduced changes in N-phenyl.

9. Dependence of the transport properties versus the photoinduced tratment at different temperatures, which correspond to different sheet sizes: 15 K – 1.6 nm; 305 K – 2.7 nm; 320 K – 3.1 nm.

10. Typical current-voltage depndences for the samples optically-treated of different sizesof microcrystalites.

11. Contribution of different parts of the microcrystalline into the transport properties of the N-phenylenes

12. Principal schema of the interface, amorhpus-like and crystalline levels in the N-phenylenes

13. Fig. 11. Non-planarity of the starting molecule. Fig. 10. Layered-like structure of the sexiphene crystallites. Fig. 12. Grain boundary topology of the sexiphene films. MD/QC simulations of photoinduced changes during the illumination.

14. S F Sh M3 M1   PM Fund. laser 2 L2 P2 P1 Sh L1 2 M4 M2 F -BBO Principal schemat of optical treatment of N-phenylene films

15. 0 d 0 1 m Fig. 1. General scheme of the medium polarization for the pure electronic contribution. d pump har Fig. 2. Electronic + harmonic electron-phonon contribution. Principal methods of creation of non-centrosymmetry.

16. 0 P  0 d pump har anhar Fig. 3. Electronic + harmonic electron-phonon + anharmonic electron-phonon contribution.

17. M BS1 YAG: Nd3+ DL P2 S PM P1 N2- laser Specimens BS2 MN PM PM2 BC Photoinduced non-cohrent optical teatment of theN-phenylenes

18. Fig. 5. The dependence lnI=f(kT-1) for for p-sexiphenyl films, Au-Al for different voltage electrode polarities: a) sample thickness d=2.0 mm, polarities electrode Au(+). Fig. 6. The dependence of I=f(U) (log plot) for: a) p-sexiphenyl cohrently treted at temperature T=200 K; Au-Al.; Al.(-).

19. (Fig. 9.) (Fig. 7.) (Fig. 8.) Fig.7. Current-voltage characteristics for polycrystalline films of the p-sexiphenyl layers. The dependence I=f(U) (log plot) for temperature of optical treatment T=20 K; Au-Al, d=2 mm using different polarities of electrodes. Fig. 8. Current-voltage characteristics for polycrystalline films of the p-sexiphenyl layers. The dependence I=f(U) (log plot) for temperature T=20 K; Au-Al, d=0,23 mm using different polarities of electrodes.Coherent poling. Fig. 9. Current-voltage characteristics for polycrystalline films of the p-sexiphenyl layers. The dependence I=f(U) (log plot) for temperature T=20 K; Au-Al, d=2 mm using different polarities of electrodes.Incoherent poling.

20. Before the optical coherent illumination NC sizes 2.1 nm

21. Typical occurrence of the morphological structure in the N-phenylene films after low-temperature optical treatment

22. Photoinduced second-order optical effects calculated for the bulk-like and nano-confined (dotted line) consideration.

23. After phototreatment at T=20 K NC sizes 1.3 nm

24. CONCLUSIONS: • Possibility of operation by the sizes of the nanocrystallites within the microcrystallite matrices • Operation by the transport propeprties through the changes of the photoinduced treatment regime and temperature of the treated crystallites. • Dominant role of the nanosheets in the transport properties • Crucial role of the photoinduced non-linear contribution in the observed effects. • Creation of technology for manufacturing of nanocomposites possessing enhanced transport effects on the base of organic microcrystalline films.