Download e-book for kindle: A system development method by Jackson M.A

By Jackson M.A

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41 Fig. 10: a. 15 b. Spectral response of the magnitude of the peak transient photoconductivity (solid squares) and the steady state photoconductivity (open circles) compared with the optical absorption spectrum (solid curve) for MEH-PPV; see ref. 17. Thus, the relevant question is whether the photoconductive response in PPV results principally from secondary processes following the photogeneration of neutral geminate pairs, in agreement with the exciton model, or from separated, mobile, positive and negative charged polarons.

On the contrary, in the PPVs, the onset of photoconductivity coincides with the onset of absorption. In the PPVs, mobile charge carriers are photogenerated (see Fig. 10). 1 eV. In the exciton picture, however, this coincidental onset of photoconductivity and absorption must be explained as an artifact: initially excitons are photogenerated with subsequent dissociation as a result of secondary processes. 41 Fig. 10: a. 15 b. Spectral response of the magnitude of the peak transient photoconductivity (solid squares) and the steady state photoconductivity (open circles) compared with the optical absorption spectrum (solid curve) for MEH-PPV; see ref.

H. Lee, G. S. J. Heeger and C. Zhang, Synth. Met. 75, 127 (1995). b. H. Lee, G. Yu, D. S. Sariciftci, F. J. Cryst. Liq. Cryst 256, 745 (1994). 53 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. N. S. Sariciftci, L. Smilowitz, A. J. Heeger, and F. Wudl, Science 258, 1474 (1992). T. W. Hagler, K. Pakbaz, and A. J. Heeger, Phys. B 49, 10968 (1994). W. Hagler, K. J. Heeger, Phys. B 51, 14199 (1995). H.

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